CN116445829B - Corrosion-resistant anchor rod and production process thereof - Google Patents
Corrosion-resistant anchor rod and production process thereof Download PDFInfo
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- CN116445829B CN116445829B CN202310716733.4A CN202310716733A CN116445829B CN 116445829 B CN116445829 B CN 116445829B CN 202310716733 A CN202310716733 A CN 202310716733A CN 116445829 B CN116445829 B CN 116445829B
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- 238000005260 corrosion Methods 0.000 title claims abstract description 86
- 230000007797 corrosion Effects 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 11
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 6
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052718 tin Inorganic materials 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 122
- 239000010959 steel Substances 0.000 claims description 122
- 238000005096 rolling process Methods 0.000 claims description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 238000003723 Smelting Methods 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 26
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 21
- 230000009467 reduction Effects 0.000 claims description 17
- 238000005520 cutting process Methods 0.000 claims description 16
- 230000007547 defect Effects 0.000 claims description 16
- 238000010079 rubber tapping Methods 0.000 claims description 14
- 239000002893 slag Substances 0.000 claims description 13
- 239000011435 rock Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 9
- 238000009842 primary steelmaking Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 238000007670 refining Methods 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000011574 phosphorus Substances 0.000 claims description 5
- 238000010008 shearing Methods 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 229910001341 Crude steel Inorganic materials 0.000 claims description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 3
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000010436 fluorite Substances 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract description 2
- 230000000704 physical effect Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 22
- 239000000463 material Substances 0.000 description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000000047 product Substances 0.000 description 9
- 239000003792 electrolyte Substances 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 239000003245 coal Substances 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 3
- 238000005868 electrolysis reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000006056 electrooxidation reaction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- -1 chlorine ions Chemical class 0.000 description 1
- CNRRZWMERIANGJ-UHFFFAOYSA-N chloro hypochlorite;molybdenum Chemical compound [Mo].ClOCl CNRRZWMERIANGJ-UHFFFAOYSA-N 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0006—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by the bolt material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to the technical field of metal product processing, in particular to an anti-corrosion anchor rod and a production process thereof. The anti-corrosion anchor rod comprises the following components in percentage by mass: 0.21 to 0.25 percent of C, 0.021 to 0.023 percent of S, 0.39 to 0.43 percent of Si, 1.01 to 1.06 percent of Mn, 0.026 to 0.029 percent of P, 5.5 to 8.4 percent of Ni, 5.5 to 8.5 percent of Cr, 0.15 to 0.18 percent of Cu, 0.18 to 0.20 percent of Mo, 0.18 to 0.20 percent of N, 0.006 to 0.008 percent of V, 81.76 to 85.83 percent of Fe, 0.002 to 0.009 percent of Sn, 0.003 to 0.008 percent of Sb and 0.001 to 0.007 percent of As. The anti-corrosion anchor rod not only meets the anti-corrosion requirement, but also meets the chemical composition and physical property requirements of GB/T35056-2018 standard, and solves the problem of serious corrosion of the existing anchor rod under the well.
Description
Technical Field
The invention relates to the technical field of metal product processing, in particular to an anti-corrosion anchor rod and a production process thereof.
Background
Because the special underground environment of the coal mine is frequently subjected to the condition that rock stratum water permeates into the roadway, and the rock stratum water contains substances such as certain salts and alkalinity, the substances can seriously rust supporting materials such as underground anchor rods and anchor ropes, further damage the strength of supporting structures, and increase hidden danger in the coal mine safety, so that the rock stratum water is extremely important for the corrosion prevention research of underground coal mine supporting metal bodies. Analysis of corrosion mechanism shows that the corrosion of the anchor rod is mainly caused by electrochemical corrosion when the anchor rod contacts with an external medium; in addition, under the action of high ground stress, the influence of corrosion on the anchor protection material is enhanced, the service time of the anchor protection material can be reduced, even the anchor protection material fails in advance, and particularly for an anchor rod in a high stress state, stress corrosion is extremely easy to occur in a corrosion environment, so that the anchor protection material fails in advance.
The corrosion-resistant anchor rod is an important invention for preventing underground safety accidents, most of the anchor rods are seriously corroded due to the influence of underground high-salt, high-humidity and high-water-spraying conditions, and the anchor rods fail in advance after long-time use.
Disclosure of Invention
One of the purposes of the invention is to provide an anti-corrosion anchor rod which not only meets the anti-corrosion requirement, but also meets the chemical composition and physical property requirements of GB/T35056-2018 standard, and solves the problem of serious corrosion of the existing anchor rod under the well.
The technical scheme of the corrosion-resistant anchor rod is as follows:
the anti-corrosion anchor rod comprises the following components in percentage by mass:
0.21 to 0.25 percent of C, 0.021 to 0.023 percent of S, 0.39 to 0.43 percent of Si, 1.01 to 1.06 percent of Mn, 0.026 to 0.029 percent of P, 5.5 to 8.4 percent of Ni, 5.5 to 8.5 percent of Cr, 0.15 to 0.18 percent of Cu, 0.18 to 0.20 percent of Mo, 0.18 to 0.20 percent of N, 0.006 to 0.008 percent of V, 81.76 to 85.83 percent of Fe, 0.002 to 0.009 percent of Sn, 0.003 to 0.008 percent of Sb and 0.001 to 0.007 percent of As.
The invention aims to provide a production process of an anti-corrosion anchor rod, which optimizes the production process of the anchor rod, improves the strength, oxidation resistance, mechanical processing performance, tensile strength, stability and the like of an anchor rod material, and can be rapidly and flexibly produced according to the requirements of customers so as to meet the different requirements of the customers.
The technical scheme of the production process of the corrosion-resistant anchor rod is as follows:
the production process of the corrosion-resistant anchor rod comprises the following steps:
(1) Smelting a steel billet, namely smelting scrap steel, nickel and alloy to obtain primary molten steel, wherein the alloy is high-carbon ferrochrome and high-carbon ferromanganese; smelting primary steelmaking water in an oxidation period, smelting the primary steelmaking water in a reduction period, adding a slag former to perform slag formation after reduction, adding a fine tuning component to fine tune target components, tapping to obtain refined molten steel, cooling, stirring, and cutting to obtain a slab;
(2) Cogging, namely adding the slab into a heating furnace, and discharging to prepare square billets; rolling square billets into round steel I, and then showering with cold water;
(3) Rough rolling, namely rolling the round steel I subjected to cold water shower into round steel II; cutting off head defects and tail defects of the round steel II;
(4) Intermediate rolling, namely rolling the round steel II with the defects cut into round steel III, straightening the round steel III, and measuring the length and the diameter of the round steel III;
(5) Finish rolling, namely firstly cooling the straightened round steel III, then removing phosphorus, and then rolling into deformed steel bars;
(6) Cutting the deformed steel bar, cutting the tail part into inclined tips, and cooling to normal temperature; then, necking the head of the die by adopting a round pressing machine to form a round head, and rolling the round head by adopting a thread rolling machine to obtain the finished product.
Preferably, in the step (1), scrap steel, nickel and alloy are added into an electric furnace for smelting, the steel tapping temperature during smelting is 1635-1685 ℃, and when the chemical components of crude steel water in the electric furnace reach C0.19-0.30%, S0.018-0.028%, si 0.32-0.46%, mn 0.98-1.09%, P0.020-0.034%, ni 5.3-8.8%, cr 5.2-9.0%, N0.14-0.23% and V0.002-0.013%, steel tapping is carried out to obtain primary steel-making water.
Further preferably, in the step (1), the primary steelmaking water is subjected to oxidation-stage smelting, wherein the oxidation-stage smelting is performed in a refining furnace at a speed of 13-20 m 3 Blowing air at the speed of/min, reducing the phosphorus content to below 0.03%, uniformly heating molten steel, and smelting in a reduction period, wherein the mass ratio of the smelting in the reduction period to a refining furnace is 9:1, and is 6-10 m 3 Nitrogen is blown in at the speed of/min, the sulfur content is reduced to below 0.03%, then a slag former is added for slag formation, fine adjustment components are added for fine adjustment of target components, and then tapping is carried out, so that refined molten steel is obtained; wherein, the slag former comprises the following components in percentage by mass: 3, lime and fluorite, wherein the fine tuning component comprises the following components in mass ratio of 8:3, wherein the target components comprise 0.21-0.25% of C, 0.39-0.43% of Si, 1.01-1.06% of Mn, 5.5-8.4% of Ni, 5.5-8.5% of Cr, 0.15-0.18% of Cu, 0.18-0.20% of Mo and 0.006-0.008% of V.
Preferably, in the step (2), the tapping temperature is 1010-1090 ℃; rolling square billets for 15 times by adopting a rolling mill, rolling the square billets into round steel I with the diameter of 45mm, and then cooling the round steel I to 855-875 ℃ by adopting a cold water shower.
Further preferably, in the step (3), the round steel I after cold water showering is rolled for 5 times by adopting a horizontal roughing mill, and rolled into round steel II with phi 35 mm; and cutting off the head defect and the tail defect of the round steel II by 200-300 mm by adopting an anchor rod shearing machine.
Still more preferably, in the step (4), the round steel II from which the defects are removed is rolled 5 times by using a middle rolling mill to form round steel III with a diameter reduction ratio of phi 25mm, wherein the diameter reduction ratio of the round steel III to the round steel II is 0.3-0.5, and the temperature after the middle rolling is reduced to below 850 ℃. Wherein, the calculation formula of the reducing ratio is as follows:
reducing ratio= (diameter of round steel II-diameter of round steel III)/diameter of round steel III.
Still more preferably, in the step (5), the straightened round steel III is placed in a cold water jet cooling system for cooling for 3 seconds and then is removed, and the temperature reduction range of the round steel III after being removed is 75-85 ℃; the water flow nozzle of the cold water jet cooling system is arranged along the length direction of the round steel III and is 1cm away from the round steel III; the water flow of the cold water jet cooling system is kept between 25 and 30m 3 And/h, the pressure is 0.3-0.5 MPa.
Still more preferably, in the step (5), after the cooled round steel III is placed in the first rolling mill, the influence of the round steel temperature on the micro tension is eliminated by rolling, and then the deformed steel bar with phi 20mm is rolled by using the second rolling mill with the patterned roller.
Preferably, in the step (6), shearing the screw-thread steel by using multiple-length shears; cutting the tail of the screw thread steel into an inclined tip, cooling to normal temperature, necking the head of the screw thread steel by adopting a round pressing machine to ensure that the surface of the head is free of transverse ribs and becomes a round head, and rolling the round pressing part of the head of the screw thread steel by adopting a thread rolling machine to obtain a finished product; and (5) checking the finished product and packaging.
Action of elements
Ni: the strength of the anchor rod can be improved, and good plasticity and toughness can be maintained. The Ni can enhance the corrosion resistance of the anchor rod in an acid-base environment, enhance the oxidation resistance, realize the rust prevention effect, reduce the formation of Fe element bodies and obviously reduce the tendency of sigma phase formation.
Cr: the oxidation resistance and corrosion resistance of the anchor rod can be obviously enhanced, the strength and hardness of the material can be enhanced by a certain content of Cr, the impact toughness and wear resistance of the material can be improved, the rust resistance and corrosion resistance of the material can be enhanced, and the passivation of the material is promoted by Cr and the result of stabilizing the material is kept in a passive state. Cr has an influence on the structure in that Cr is an element that strongly forms and stabilizes iron bodies, shrinking the austenite region.
Cu: the machining performance of the anchor rod can be enhanced, the atmospheric corrosion resistance of the material can be improved, the stability of austenite in the material can be improved, ferrite is reinforced, and the corrosion resistance in a reducing medium can be improved.
Si: can obviously strengthen ferrite and has stronger solid-to-solid strengthening effect, can obviously improve the tensile strength of steel, and slightly improves the yield strength of steel with reduced plastic toughness. Si is added to form compact SiO on the surface of the material 2 And the protective film prevents the corrosion medium from further corroding the anchor rod. The addition of silicon can also passivate the matrix metal in the material structure, namely the anode region, so that the electrode potential is improved, and the chemical corrosion resistance and electrochemical corrosion resistance of the anchor rod and the anchor cable are effectively improved.
V: belongs to the transition group element, and the transition group element atoms and the C atoms can form metallic bonds and covalent bonds when interacting, and V is not only a deoxidizer but also an strengthening element of the alloy, is known as a vitamin in the alloy, and can improve the strength, the toughness and other properties by adding V.
Mo: can effectively improve the stability of the anchor rod and the anchor cable in chlorine-containing media, and molybdenum can react with chloride ions to generate molybdenum oxychloride (MoO) 2 Cl 2 ) The passivation film improves the corrosion resistance of chlorine ions, simultaneously eliminates graphitization on the structure and strengthens SiO 2 And a protective film.
Advantageous effects
The anchor rod comprises the following components in percentage by mass: 0.21 to 0.25 percent of C, 0.021 to 0.023 percent of S, 0.39 to 0.43 percent of Si, 1.01 to 1.06 percent of Mn, 0.026 to 0.029 percent of P, 5.5 to 8.4 percent of Ni, 5.5 to 8.5 percent of Cr, 0.15 to 0.18 percent of Cu, 0.18 to 0.20 percent of Mo, 0.18 to 0.20 percent of N, 0.006 to 0.008 percent of V, and the balance of 81.76 to 85.83 percent of Fe, 0.002 to 0.009 percent of Sn, 0.003 to 0.008 percent of Sb and 0.001 to 0.007 percent of As. According to the invention, the effective components in the anchor rod are adjusted, the elements and the content thereof in the anchor rod are improved, the production and processing technology of the anchor rod is optimized, the strength, oxidation resistance, mechanical processing performance, tensile strength, stability and the like of the anchor rod material are improved, on the basis of the conventional anchor rod performance, the rust-proof requirement is met, the prepared anchor rod meets the chemical component, tensile strength and elongation requirements of the technical specification GB/T35056-2018 standard of the coal mine tunnel anchor rod, and the problem of severe underground corrosion of the existing anchor rod is solved.
Drawings
FIG. 1 is a schematic view of an anchor rod according to example 1 of the present invention;
FIG. 2 is an accelerated corrosion electrolytic test apparatus for anchor rods according to the present invention;
FIG. 3 is a profile of the anchor rod of example 1 before and after corrosion, wherein a is a profile of the anchor rod of example 1 before electrolytic corrosion, b is a profile of the anchor rod of example 1 after electrolytic corrosion, and c is a profile of the anchor rod for crude ore before electrolytic corrosion; d is a topography diagram of the raw ore rock bolt after electrolytic corrosion.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
1. The specific examples of the corrosion-resistant anchor rod of the present invention are as follows:
example 1
The anti-corrosion anchor rod comprises the following components in percentage by mass:
0.21 to 0.25 percent of C, 0.021 to 0.023 percent of S, 0.39 to 0.43 percent of Si, 1.01 to 1.06 percent of Mn, 0.026 to 0.029 percent of P, 5.5 to 8.4 percent of Ni, 5.5 to 8.5 percent of Cr, 0.15 to 0.18 percent of Cu, 0.18 to 0.20 percent of Mo, 0.18 to 0.20 percent of N, 0.006 to 0.008 percent of V, 81.76 to 85.83 percent of Fe, 0.002 to 0.009 percent of Sn, 0.003 to 0.008 percent of Sb and 0.001 to 0.007 percent of As.
Example 2
The anti-corrosion anchor rod comprises the following components in percentage by mass: 0.21% of C, 0.023% of S, 0.39% of Si, 1.01% of Mn, 0.029% of P, 6.5% of Ni, 6.5% of Cr, 0.15% of Cu, 0.20% of Mo, 0.18% of N, 0.008% of V, 84.78% of Fe, 0.009% of Sn, 0.004% of Sb and 0.007% of As.
Example 3
The anti-corrosion anchor rod comprises the following components in percentage by mass: 0.25% of C, 0.021% of S, 0.43% of Si, 1.06% of Mn, 0.026% of P, 7.47% of Ni, 8.4% of Cr, 0.18% of Cu, 0.18% of Mo, 0.20% of N, 0.006% of V, 81.76% of Fe, 0.002% of Sn, 0.008% of Sb and 0.007% of As.
Example 4
The anti-corrosion anchor rod comprises the following components in percentage by mass: 0.23% of C, 0.023% of S, 0.41% of Si, 1.04% of Mn, 0.028% of P, 7.3% of Ni, 7.6% of Cr, 0.16% of Cu, 0.19% of Mo, 0.19% of N, 0.008% of V, 82.8% of Fe, 0.007% of Sn, 0.007% of Sb and 0.007% of As.
2. The specific examples of the production process of the corrosion-resistant anchor rod of the invention are as follows:
example 4 (Cold Water shower to 867 ℃ C.)
The production process of the corrosion-resistant anchor rod comprises the following steps:
(1) Smelting steel billet
Smelting in an electric furnace, namely adding scrap steel, nickel and alloy (the alloy is high-carbon ferrochrome and high-carbon ferromanganese) into the electric furnace for smelting, wherein the steel tapping temperature is controlled to be 1635-1685 ℃ during smelting, and tapping is controlled when the chemical components of crude steel in the electric furnace reach C0.19-0.30%, S0.018-0.028%, si 0.32-0.46%, mn 0.98-1.09%, P0.020-0.034%, ni 5.3-8.8%, cr 5.2-9.0%, N0.14-0.23% and V0.002-0.013% standard time, so as to obtain primary steelmaking water;
refining in an argon-oxygen refining furnace, and firstly carrying out oxidation-phase smelting on primary steelmaking water, wherein the oxidation-phase smelting is carried out in the refining furnace at a speed of 13-20 m 3 Blowing air at the speed of/min, reducing the phosphorus content to below 0.03%, uniformly heating molten steel, and smelting in a reduction period, wherein the mass ratio of the smelting in the reduction period to a refining furnace is 9:1, and is 6-10 m 3 Nitrogen is blown in at a rate of/min to reduce the sulfur content to below 0.03%; adding a slag former for slag formation after reduction, adding a fine tuning component for fine tuning a target component, tapping to obtain refined molten steel, cooling, stirring, and cutting to obtain a plate blank; wherein, the slag former comprises the following components in percentage by mass: 3, lime and fluorite, wherein the fine tuning component comprises the following components in mass ratio of 8:3, wherein the target components comprise 0.21-0.25% of C, 0.39-0.43% of Si, 1.01-1.06% of Mn, 5.5-8.4% of Ni, 5.5-8.5% of Cr, 0.15-0.18% of Cu, 0.18-0.20% of Mo and 0.006-0.008% of V.
(2) Cogging, namely pouring the slab into a push steel type heating furnace, discharging at 1010-1090 ℃ to form square billets; the square billet is rolled into round steel with phi of 45mm by adopting a rolling mill for 15 times, and the round steel I is cooled to 865+/-10 ℃ by adopting a cold water shower because the rolling temperature is reduced less.
(3) Rough rolling, namely rolling phi 45mm round steel I subjected to cold water shower by adopting a horizontal rough rolling mill for 5 times to obtain phi 35mm round steel II; and cutting off the head and tail defects of the round steel II by adopting an anchor rod shearing machine, wherein the cutting-off length of the head defect of the round steel II is 200-300 mm, and the cutting-off length of the tail defect of the round steel II is 200-300 mm.
(4) Intermediate rolling, namely rolling the phi 35mm round steel II with the head and tail defects cut off by adopting an intermediate rolling mill for 5 times, wherein the intermediate rolling mill reduces the rolling circle of the round steel II, rolls the round steel II into phi 25mm round steel III, and the reducing ratio of the round steel III to the round steel II is 0.3-0.5, wherein the temperature is reduced to below 850 ℃; straightening the round steel III, and measuring the length and the diameter of the round steel III to ensure the quality of the round steel III;
(5) Finish rolling, arranging a cold water jet cooling system before rolling finished products, arranging water flow nozzles along the trend of the anchor rod, and keeping the water flow at 25-30 m at a distance of 1cm from the anchor rod 3 And/h, the pressure is 0.3-0.5 MPa; after the phi 25mm round steel III enters a cold water jet cooling system, cooling in the cooling system for 3 seconds and then rapidly removing, wherein the cooling in the cooling system can reduce the temperature of the round steel III by 75-85 ℃; then, the round steel III enters a dephosphorization box, the round steel III after dephosphorization is sent to a finishing mill group for rolling, after the round steel III is firstly rolled by a first rolling mill, the influence of the temperature of the round steel III on micro tension is eliminated by rolling, and after the round steel III enters a second rolling mill, the second rolling mill is rolled into phi 20mm deformed steel bars by pattern-containing rollers.
Cutting the deformed steel bar according to the required size by adopting a pair of rule scissors, cutting the tail of the deformed steel bar into inclined tips, and cooling to normal temperature; then, necking the head of the deformed steel bar by adopting a rounding press, so that the surface of the head of the deformed steel bar is not provided with transverse ribs any more, and the deformed steel bar becomes a round head; then, a thread rolling machine is adopted to roll thread on the thread steel with the round head pressed to obtain a thread steel finished product, and if the thread steel transverse rib is not flattened, the tool jump is easy to occur; and finally, checking whether the deformed steel bar finished product is qualified or not, and packaging after the deformed steel bar finished product is qualified.
The finished product comprises the following components in percentage by mass:
0.21 to 0.25 percent of C, 0.021 to 0.023 percent of S, 0.39 to 0.43 percent of Si, 1.01 to 1.06 percent of Mn, 0.026 to 0.029 percent of P, 5.5 to 8.4 percent of Ni, 5.5 to 8.5 percent of Cr, 0.15 to 0.18 percent of Cu, 0.18 to 0.20 percent of Mo, 0.18 to 0.20 percent of N, 0.006 to 0.008 percent of V, and the balance of 81.76 to 85.83 percent of Fe, 0.002 to 0.009 percent of Sn, 0.003 to 0.008 percent of Sb and 0.001 to 0.007 percent of As.
The anchors of the above examples 1 to 3 were also produced by the production process of example 4.
Anchor rod corrosion resistance characterization and analysis
(1) Purpose of test
Analysis of the corrosion mechanism and main corrosion influence factors of the anchor rod in a certain mining area proves that the corrosion of chloride ions in mine water to the anchor rod is most remarkable. In order to test the corrosion resistance of the anchor rod material, the anchor rod is tested through an electrolytic test, an enhanced corrosion solution obtained by amplifying the concentration of 5 times of chloride ions on the basis of simulating mine water is used as electrolyte, the corrosion condition of the anchor rod is observed, and the corrosion resistance of the anchor rod is analyzed. The anchor rod of example 1 of the present invention is shown in fig. 1.
(2) Test device and principle
The experiment adopts a self-made anchor rod accelerated corrosion electrolysis test device, which mainly comprises a reaction tank, electrolyte (the electrolyte is mainly chloride ion solution of 350 mg/L), a wire, a direct current power supply, a liquid container, an anchor rod test piece and a graphite electrode. And the electrode of the anchor rod test piece and the graphite electrode are electrified through a direct-current power supply, so that the anchor rod test piece generates electrochemical reaction in electrolyte, and the corrosion rate of the anchor rod test piece is accelerated. After the assembly is completed, the resistance of the electrolytic system is measured, so that the resistance values of all test groups are kept consistent, and the consistency of test conditions is ensured. The reaction tank made of transparent materials is convenient for observing the electrolytic reaction process and the electrode change. The electrolytic test device for the accelerated corrosion of the anchor rod is shown in figure 2.
(3) Test protocol
The method comprises the steps of using an enhanced corrosion solution obtained by amplifying the concentration of 5 times of chloride ions on the basis of simulating mine water as electrolyte, placing an electrode and a graphite electrode which are made of an anchor rod into a reaction tank filled with the electrolyte, connecting a circuit, providing stable 2A current for the electrode of an anchor rod sample and the graphite electrode through a direct current power supply, electrolyzing for 15 hours, taking out the sample, and observing the corrosion condition of the anchor rod.
(4) Analysis of corrosion morphology of anchor rod
And after the anchor rod electrolysis is finished, taking out the test piece, removing rust and drying after removing the accessories, and photographing to record the corrosion condition of the test piece. The morphology of the test piece before and after corrosion is shown in fig. 3.
Observing the corrosion condition of the anchor rod test piece:
as can be seen from fig. 3a and 3b, the anchor rod test piece in embodiment 1 of the present invention has darker overall color after corrosion, flat surface but black spots, and mainly has pitting. The corrosion depth of each point is shallow, most of the points are rusty spots, and the corrosion pits are small in size and small in number. The anchor rod is uniformly corroded on the whole, the degree is small, the diameter change of the rod body is extremely small, and the loss of the cross-sectional area of each position is also small.
As can be seen from fig. 3c and 3d, the crude rock bolt test piece is yellow brown in overall after corrosion, has a rough surface, is mainly subjected to local corrosion, and has wide overall distribution and large size of corrosion pits. The corrosion of part of the positions is serious, obvious section area loss occurs, the diameter of the rod body is obviously reduced, and the size fluctuation is uneven.
As can be seen by comparing the electrolytic corrosion conditions of the prepared anchor rod and the original anchor rod under the chloride ion enhanced electrolyte, the corrosion degree of the anchor rod is far smaller than that of the original anchor rod, the local corrosion is lighter, the diameter consistency of the anchor rod body is excellent, and the loss of the cross section area of the anchor rod is smaller.
(5) Mass loss analysis and results
After the electrolysis of the anchor rod in embodiment 1 of the present invention is completed, the anchor rod is taken out, the attachments such as the wires are removed, rust removal and drying are performed, and then weighing is performed. The quality change condition of the anchor rod can be obtained by comparing the quality of the anchor rod before and after the test. The mass of the anchor rod before and after corrosion release is shown in table 1.
TABLE 1 quality comparison of Anchor rods before and after electrolytic corrosion
As can be seen from Table 1, the mass loss rate of the anchor rod of the present invention is significantly reduced from 5.42% to 1.03% by comparing the mass loss conditions of the anchor rod of the present invention and the anchor rod for raw ore, and the reduction in amplitude is further increased if the test time is increased.
The corrosion degree of the anchor rod is obviously lighter than that of the anchor rod for the raw ore by comprehensively comparing the appearance change and the quality loss of the anchor rod for the raw ore. In conclusion, the anchor rod has outstanding corrosion resistance and obvious advantages.
The tensile strength of the anchor rod with the diameter of 20mm, which is manufactured by adopting the process, is at least 12T, and the elongation is not lower than 15 percent, and the anchor rod meets the requirements of chemical components, tensile strength and elongation of the technical specification GB/T35056-2018 of the coal mine tunnel anchor rod.
According to the technical scheme, compared with the prior art, the anti-corrosion anchor rod and the production process thereof have the anti-corrosion effect, the occurrence probability of underground safety accidents can be reduced, and meanwhile, the anchor rod meeting different customer requirements can be rapidly and flexibly produced according to the customer requirements.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. The corrosion-resistant anchor rod is characterized by comprising the following components in percentage by mass:
0.21 to 0.25 percent of C, 0.021 to 0.023 percent of S, 0.39 to 0.43 percent of Si, 1.01 to 1.06 percent of Mn, 0.026 to 0.029 percent of P, 5.5 to 8.4 percent of Ni, 6.5 to 8.5 percent of Cr, 0.15 to 0.18 percent of Cu, 0.18 to 0.20 percent of Mo, 0.18 to 0.20 percent of N, 0.006 to 0.008 percent of V, 81.76 to 85.83 percent of Fe, 0.002 to 0.009 percent of Sn, 0.003 to 0.008 percent of Sb and 0.001 to 0.007 percent of As.
2. A process for producing a corrosion resistant rock bolt according to claim 1, comprising the steps of:
(1) Smelting a steel billet, namely adding scrap steel, nickel and alloy into an electric furnace to perform smelting, wherein the steel tapping temperature is 1635-1685 ℃, and tapping when the steel tapping temperature reaches 1635-1685 ℃, and when the chemical components of crude steel water in the electric furnace reach C0.19-0.30%, S0.018-0.028%, si 0.32-0.46%, mn 0.98-1.09%, P0.020-0.034%, ni 5.3-8.8%, cr 5.2-9.0%, N0.14-0.23% and V0.002-0.013%, obtaining primary molten steel, wherein the alloy is high-carbon ferrochrome and high-carbon ferromanganese; smelting primary steelmaking water in an oxidation period, smelting the primary steelmaking water in a reduction period, adding a slag former to perform slag formation after reduction, adding a fine tuning component to fine tune target components, tapping to obtain refined molten steel, cooling, stirring, and cutting to obtain a slab;
(2) Cogging, namely adding the slab into a heating furnace, and discharging to prepare square billets; rolling square billets into round steel I, and then showering with cold water;
(3) Rough rolling, namely rolling the round steel I subjected to cold water shower into round steel II; cutting off head defects and tail defects of the round steel II;
(4) Intermediate rolling, namely rolling the round steel II with the defects cut into round steel III, straightening the round steel III, and measuring the length and the diameter of the round steel III;
(5) Finish rolling, namely firstly cooling the straightened round steel III, then removing phosphorus, and then rolling into deformed steel bars;
(6) Cutting the deformed steel bar, cutting the tail part into inclined tips, and cooling to normal temperature; then, necking the head of the die by adopting a round pressing machine to form a round head, and rolling the round head by adopting a thread rolling machine to obtain the finished product.
3. The process for producing a corrosion-resistant rock bolt according to claim 2, wherein in the step (1), primary steelmaking water is subjected to oxidation-stage smelting, wherein the oxidation-stage smelting is carried out in a refining furnace at a speed of 13-20 m 3 Air is blown in at the speed of/min, the phosphorus content is reduced to below 0.03%, and then reduction smelting is carried out, wherein the mass ratio of the reduction smelting to the refining furnace is 9:1, and is 6-10 m 3 Nitrogen is blown in at the speed of/min, the sulfur content is reduced to below 0.03%, then a slag former is added for slag formation, fine adjustment components are added for fine adjustment of target components, and then tapping is carried out, so that refined molten steel is obtained; wherein, the slag former comprises the following components in percentage by mass: 3, lime and fluorite, wherein the fine tuning component comprises the following components in mass ratio of 8:3, wherein the target components comprise 0.21-0.25% of C, 0.39-0.43% of Si, 1.01-1.06% of Mn, 5.5-8.4% of Ni, 6.5-8.5% of Cr, 0.15-0.18% of Cu, 0.18-0.20% of Mo and 0.006-0.008% of V.
4. The process for producing a corrosion-resistant rock bolt according to claim 2, wherein in step (2), the tapping temperature is 1010 to 1090 ℃; rolling square billets for 15 times by adopting a rolling mill, rolling the square billets into round steel I with the diameter of 45mm, and then cooling the round steel I to 855-875 ℃ by adopting a cold water shower.
5. The process for producing the corrosion-resistant anchor rod according to claim 4, wherein in the step (3), the round steel I after cold water showering is rolled 5 times by a horizontal roughing mill to form round steel II with phi 35 mm; and cutting off the head defect and the tail defect of the round steel II by 200-300 mm by adopting an anchor rod shearing machine.
6. The process for producing a corrosion-resistant rock bolt according to claim 5, wherein in the step (4), the round steel II from which the defect is removed is rolled 5 times by a middle rolling mill to form a round steel III having a diameter reduction ratio of phi 25mm, the ratio of the round steel III to the round steel II is 0.3 to 0.5, and the temperature after the middle rolling is reduced to below 850 ℃.
7. The process for producing a corrosion-resistant rock bolt according to claim 6, wherein in the step (5), the straightened round steel III is placed in a cold water jet cooling system for cooling for 3 seconds and then is removed, and the temperature reduction range of the round steel III after removal is 75-85 ℃; the water flow nozzle of the cold water jet cooling system is arranged along the length direction of the round steel III and is 1cm away from the round steel III; the water flow of the cold water jet cooling system is kept between 25 and 30m 3 And/h, the pressure is 0.3-0.5 MPa.
8. The process for producing a corrosion-resistant rock bolt according to claim 7, wherein in the step (5), after the cooled round steel III is placed in the first rolling mill, the influence of the round steel temperature on the micro tension is eliminated by rolling, and then the deformed steel bar with a diameter of 20mm is rolled by the second rolling mill having a patterned roll.
9. The process for producing a corrosion-resistant rock bolt according to claim 2, wherein in the step (6), a screw steel is sheared by a pair of shearing machines; cutting the tail of the screw thread steel into an inclined tip, cooling to normal temperature, necking the head of the screw thread steel by adopting a round pressing machine to ensure that the surface of the head is free of transverse ribs, turning the head into a round head, and rolling the round pressing part of the head of the screw thread steel by adopting a thread rolling machine to obtain a finished product; and (5) checking the finished product and packaging.
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| CN107619994B (en) * | 2017-04-27 | 2019-04-02 | 中国石油大学(北京) | A kind of anti-CO2/H2The seamless line pipe and its manufacturing method of S and sulfate reducing bacteria corrosion |
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| WO2011111872A1 (en) * | 2010-03-11 | 2011-09-15 | 新日本製鐵株式会社 | High-strength steel and high-strength bolt with excellent resistance to delayed fracture, and manufacturing method therefor |
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