CN115807194B - Production method of Q345B steel plate with thickness of more than 150mm and less than or equal to 250mm - Google Patents
Production method of Q345B steel plate with thickness of more than 150mm and less than or equal to 250mm Download PDFInfo
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- CN115807194B CN115807194B CN202211640430.0A CN202211640430A CN115807194B CN 115807194 B CN115807194 B CN 115807194B CN 202211640430 A CN202211640430 A CN 202211640430A CN 115807194 B CN115807194 B CN 115807194B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 71
- 239000010959 steel Substances 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 41
- 238000001816 cooling Methods 0.000 claims abstract description 30
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims abstract description 4
- 230000009467 reduction Effects 0.000 claims description 9
- 208000020990 adrenal cortex carcinoma Diseases 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 5
- 230000009286 beneficial effect Effects 0.000 claims description 4
- 238000010583 slow cooling Methods 0.000 claims description 3
- 238000004512 die casting Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 238000003466 welding Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 230000000881 depressing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
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- 238000009659 non-destructive testing Methods 0.000 description 1
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- 238000010008 shearing Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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Abstract
The invention belongs to the field of extra-thick plate production, and particularly relates to a production method of a Q345B steel plate with the thickness of 150-250mm, wherein the steel plate comprises the following chemical components in percentage by mass (unit, wt%): c:0.12 to 0.18 percent of Si: less than or equal to 0.50 percent, mn:1.40 to 1.60 percent of: less than or equal to 0.015 percent, S: less than or equal to 0.005 percent, ti: less than or equal to 0.020 percent, als:0.030 to 0.060 percent, the rest being Fe and residual elements, the carbon equivalent CEV: C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15 is less than or equal to 0.45; according to the scheme, on the basis of no addition of other micro-alloy elements, conventional C, mn, ALs and other alloy elements are adopted, steel ingots produced through a water-cooled die are used as raw materials and a low-temperature heating process of a heat accumulating type heating furnace, and special high-temperature controlled rolling, repeated intermittent quick cooling and redness returning [ TM+NCP+BT ] processes are adopted to produce the extra-thick plate with good strength, plasticity, toughness, excellent lamellar tearing resistance and good welding performance.
Description
Technical Field
The invention belongs to the field of extra-thick plate production, and particularly relates to a production method of a Q345B steel plate with the thickness of more than 150mm and less than or equal to 250 mm.
Background
Q345B belongs to the most widely used steel grade of low alloy series, and the steel plate has good strength, impact toughness, welding performance and cutting performance, and is mainly used in industries of factory building structures, buildings, vehicles, machining and the like. At present, steel plates with the thickness of more than 150mm are delivered in a normalizing state, and the main reasons are influenced by the thickness of steel billets, the heating temperature of hot steel and the rolling mode, and if the steel plates are not subjected to heat treatment, the tensile strength and the impact absorption power cannot meet the standard requirements. In recent years, the competition in the steel industry is increasingly strong, and the energy conservation and emission reduction, the capacity improvement and the production cost reduction of the steel plate production are important means for improving the market share of steel enterprises.
Disclosure of Invention
In order to meet the technical requirements, the invention aims to provide a production method of a Q345B steel plate with the thickness of more than 150mm and less than or equal to 250mm, wherein the performance requirements of Q345B can be met without heat treatment in the production process, and the low cost is realized.
In order to achieve the above purpose, the invention adopts the following technical scheme: a method for producing a steel plate with a thickness Q345B of more than 150mm and less than or equal to 250mm, wherein the steel plate comprises the following chemical components in percentage by mass: c:0.12 to 0.18 percent of Si: less than or equal to 0.50 percent, mn:1.40 to 1.60 percent of: less than or equal to 0.015 percent, S: less than or equal to 0.005 percent, ti: less than or equal to 0.020 percent, als:0.030 to 0.060 percent, the rest being Fe and residual elements, the carbon equivalent CEV: C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15 is less than or equal to 0.45;
according to the thickness of the finished steel plate, producing cast ingots with 500-950mm by using a water-cooling die casting mode, so that the rolling ratio is more than 3;
when a high-temperature casting blank enters a rolling mill, high-pressure water spraying is started once, each rolling pass is performed, rolling is stopped for 1-2 passes, the rolling blank only passes through the rolling mill for 1-2 passes, and the reciprocating 1-2 passes only perform high-pressure water spraying cooling, wherein the initial rolling temperature is 950-980 ℃, and the rolling reduction of normal passes is as follows: the surface temperature of the steel plate is obviously lower than the core temperature by 40-50 mm/pass when being matched with the cooling mode, and the temperature difference is more than or equal to 50 ℃ compared with the core temperature, so that the rolling mill reduction force is beneficial to permeation to 1/2 part;
entering ACC laminar cooling within 30 seconds after the rolling of the steel plate, and rapidly cooling at a cooling speed of 4-6 ℃/S; according to the thickness of the steel plate, the reciprocating times of ACC are different, and the specific times refer to the following table:
and (3) slow cooling of the steel plate: the steel plate is fully reddened after ACC treatment, so that the temperature difference between the inside and the outside of the steel plate tends to be consistent, then the steel plate is intensively stacked, the stacking cooling temperature is 350-420 ℃, the coverage is neat, and the stacking cooling time is more than or equal to 72 hours.
The beneficial effects of the invention are as follows: when a high-temperature casting blank enters a rolling mill, high-pressure water spraying is started once, each rolling pass is performed, rolling is stopped for 1-2 passes, the rolling blank only passes through the rolling mill for 1-2 passes, and the reciprocating 1-2 passes only perform high-pressure water spraying cooling, wherein the initial rolling temperature is 950-980 ℃, and the rolling reduction of normal passes is as follows: the combination of the rolling and cooling modes adopts 40-50 mm/pass, the surface temperature of the steel plate is obviously lower than the core temperature compared with the core temperature, the temperature difference is more than or equal to 50 ℃, the penetration of rolling mill depressing force to 1/2 part is facilitated, the core shrinkage cavity and shrinkage porosity are eliminated, the segregation phenomenon is dispersed, and the internal and external tissues tend to be uniform.
The high-temperature controlled rolling steel plate is repeatedly cooled through ACC, the growth and recrystallization of austenite grains are restrained, supercooled austenite is formed, the supercooled austenite enters a phase change region through controlling the reddening temperature, and further a fine F+P two-phase structure is obtained, the toughness matching of the steel plate is ensured, and the lamellar tearing resistance is achieved.
And (3) a cold stacking process: the concentrated stack cooling can fully release the internal stress of the steel plate, reduce the strength and ensure the matching of the toughness of the steel plate.
Steel sheet properties: the performance detection is carried out on the embodiment of the invention, the steel plate has better obdurability matching and lamellar tearing resistance performances, such as yield strength, tensile strength, elongation, impact energy and Z-direction performance, and can completely replace the performance of the normalized steel plate, thereby reducing the heat treatment benefit by 80 yuan/ton.
Drawings
FIG. 1 shows a metallographic structure (metallographic microscope, X100) of a head portion having a thickness of 1/4 of the head portion in accordance with the embodiment of the present invention.
FIG. 2 shows a metallographic structure (metallographic microscope, X200) of a portion of the head having a thickness of 1/2 of the thickness of the head according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The invention is described in further detail below in connection with production examples.
The scheme provides a Q345B steel plate with the thickness of more than 150mm and less than or equal to 250mm, and the chemical composition is designed as follows: c:0.15%, si:0.40%, mn:1.55%, P:0.009%, S:0.002%, als:0.035%, ti:0.015%, carbon equivalent cev=0.42%.
The production method comprises the following steps:
1) Smelting and casting clean steel: smelting and casting clean steel: the steel making adopts a clean steel smelting process, the P of a finished product is less than or equal to 100ppm, S is less than or equal to 17ppm, H is less than or equal to 1.0ppm, O is less than or equal to 30ppm, N is less than or equal to 50ppm, a water cooling mold with independent property rights of Han and a micro defect pouring technology are used, molten steel is solidified into a feeding channel with a large upper part and a small lower part, the feeding channel is quickly solidified, the internal looseness of a steel ingot is reduced, original grains are finer, the ingot is adjusted according to the thickness of the steel plate, and the steel is compressed by 3-6;
2) Heating steel ingot: five stages of steel stewing, temperature rising, heat preservation, secondary temperature rising and soaking are needed, wherein the temperature of the steel stewing is less than 650 ℃, the temperature rising speed is controlled to be less than 80 ℃/h in the temperature rising stage, the heat preservation temperature of the middle section is 900 ℃, the soaking stage is heated at a low temperature, the temperature is controlled according to 1220-1240 ℃, and the temperature fluctuation of the ingot temperature of the soaking stage is less than 15 ℃. The heating temperature uniformity of the blank is ensured, the total heating time is controlled to be 22-34 hours according to the thickness of 500-950mm of the blank, the energy loss is reduced, and the original crystal grains of the blank are ensured;
3) Rolling: the high temperature control rolling and multiple intermittent quick cooling process is adopted, and the high temperature control rolling is adopted for the steel plate rolling, and the process is characterized in that: the rolling temperature is 950-980 ℃, the rolling reduction is as follows: the temperature difference between the surface of a steel plate used for continuous block rolling and a core part is more than or equal to 50 ℃ and is beneficial to permeation of rolling mill reduction force to 1/2 part, and the high-pressure water is used for each pass of 40-50 mm;
4) The steel cooling control process comprises the following steps: entering ACC laminar cooling within 30 seconds after the rolling of the steel plate, and rapidly cooling at a cooling speed of 5 ℃/S;
5) The reddening time of the steel plate is 30-60S after cooling once, so that the temperature uniformity and the flatness of the whole plate are ensured;
6) And (3) slow cooling of the steel plate: the steel plates enter a cooling bed and then fully return to red and slowly heat, so that the core temperature of the steel plates is fully released, the stacking cooling temperature is 350-420 ℃, the steel plates are intensively stacked, the coverage is neat, and the stacking cooling time is more than or equal to 72 hours.
By the production method, the rolled steel plate has the following physical mass:
(1) Mechanical property detection
The mechanical property test piece sampling position and sample preparation of the steel plate are carried out according to the GB/T2975 and GB/T5313 regulations, the impact toughness test is carried out according to the GB/T229 standard, and the tensile property test is carried out according to the GB/T228 standard.
The mechanical properties test results are shown in the following table:
(2) Metallographic structure detection
The metallographic structure is evaluated according to the GB/T13299 method for evaluating the microstructure of steel and the GB/T6394 method for measuring the average grain size of metal, and the matrix structure is mainly ferrite and pearlite, and the grain size is 8-9 grades. The Z-direction stretching fracture is in a cup cone shape on a macroscopic scale, mainly comprises a central fiber area and a shearing lip on the circumference, and is mainly a ductile fossa fracture with better plasticity under a scanning electron microscope.
(3) Inclusion detection
The inclusion is rated according to GB/T10561 microscopic examination method of measuring standard rating diagram for nonmetallic inclusion content in steel, and the detection results are shown in the following table:
(4) Nondestructive flaw detection
Nondestructive testing of third part of pressure-bearing equipment according to NB/T47013.3-2015: and (3) carrying out nondestructive flaw detection according to ultrasonic detection standard, and combining the level I.
According to the test result, the Q345B steel plate with the thickness of more than 150-250mm produced by the embodiment of the invention has excellent flaw detection quality, and the flaw detection meets NB/T47013.3-2015I grade; the grain structure is uniform and fine, mainly ferrite and pearlite, has excellent lamellar tearing resistance, and the steel plate has better strength, elongation and impact toughness, and can completely replace the performance of a normalized steel plate.
Claims (1)
1. A production method of a Q345B steel plate with the thickness of more than 150mm and less than or equal to 250mm is characterized by comprising the following steps: the steel plate comprises the following chemical components in percentage by mass: c:0.12 to 0.18 percent of Si: less than or equal to 0.50 percent, mn:1.40 to 1.60 percent of: less than or equal to 0.015 percent, S: less than or equal to 0.005 percent, ti: less than or equal to 0.020 percent, als:0.030 to 0.060 percent, the rest being Fe and residual elements, the carbon equivalent CEV: C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15 is less than or equal to 0.45;
according to the thickness of the finished steel plate, producing cast ingots with 500-950mm by using a water-cooling die casting mode, so that the rolling ratio is more than 3;
when a high-temperature casting blank enters a rolling mill, high-pressure water spraying is started once, each rolling pass is performed, rolling is stopped for 1-2 passes, the rolling blank only passes through the rolling mill for 1-2 passes, and the reciprocating 1-2 passes only perform high-pressure water spraying cooling, wherein the initial rolling temperature is 950-980 ℃, and the rolling reduction of normal passes is as follows: the surface temperature of the steel plate is obviously lower than the core temperature by 40-50 mm/pass when being matched with the cooling mode, and the temperature difference is more than or equal to 50 ℃ compared with the core temperature, so that the rolling mill reduction force is beneficial to permeation to 1/2 part;
entering ACC laminar cooling within 30 seconds after the rolling of the steel plate, and rapidly cooling at a cooling speed of 4-6 ℃/S; according to the thickness of the steel plate, the reciprocating times of ACC are different, and the specific times refer to the following table:
and (3) slow cooling of the steel plate: the steel plate is fully reddened after ACC treatment, so that the temperature difference between the inside and the outside of the steel plate tends to be consistent, then the steel plate is intensively stacked, the stacking cooling temperature is 350-420 ℃, the coverage is neat, and the stacking cooling time is more than or equal to 72 hours.
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- 2022-12-20 CN CN202211640430.0A patent/CN115807194B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101871083A (en) * | 2010-06-14 | 2010-10-27 | 南阳汉冶特钢有限公司 | Ultra-thick low-alloy high-strength Q345-series steel plate and production method thereof |
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