CN111270169A - Ni-containing alloy steel plate with excellent low-temperature toughness and production method thereof - Google Patents
Ni-containing alloy steel plate with excellent low-temperature toughness and production method thereof Download PDFInfo
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B1/46—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 metal immediately subsequent to continuous casting
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C22C33/04—Making ferrous alloys by melting
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention discloses a Ni-containing alloy steel plate with excellent low-temperature toughness and a production method thereof, wherein the Ni-containing alloy steel plate comprises the following components in percentage by mass: 0.04 to 0.10 percent of C, 0.05 to 0.30 percent of Si, 0.80 to 1.20 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.05 percent of S, 7.0 to 8.0 percent of Ni0, 0.020 to 0.050 percent of Al, 0.2 to 0.30 percent of Cr0.2, 0.2 to 0.30 percent of Mo0.020 to 0.030 percent of Nb0.020, 0.04 to 0.06 percent of V, 0.002 to 0.005 percent of Ca0.005 percent, less than or equal to 0.012 percent of As, less than or equal to 0.015 percent of Sn, less than or equal to 0.003 percent of Sb. The alloy steel plate provided by the invention meets the requirements of a continuous casting type Ni-containing steel plate with the thickness of 10-50 mm of a low-temperature pressure container, and has the characteristics of high purity, uniform components and good mechanical properties.
Description
Technical Field
The invention relates to the technical field of steel for pressure vessels, in particular to a Ni-containing alloy steel plate with excellent low-temperature toughness and a production method thereof.
Background
In recent years, the construction pace of large-scale ethylene projects of 80-100 million tons is accelerated in China, the proportion of natural gas in energy demand is continuously increased, and the LNG transportation and storage technology is rapidly developed. And the 9Ni steel required for constructing the low-temperature storage tank is widely applied due to the excellent toughness of the steel in the ultralow-temperature environment of-196 ℃. At present, China already realizes the large-scale industrial production of 9Ni steel. As a typical heat treatment steel type, 9Ni steel has high Ni content, high production difficulty, narrow heat treatment process window and high process energy consumption, so the production cost is high. Ni is the most expensive alloy element in 9Ni steel, and the Ni resource reserves in China are small, so that the production cost of the 9Ni steel is high, and the market competitiveness of the product is low. Therefore, there is a need to develop steels with lower Ni content and to explore an optimized production process to reduce production costs.
Disclosure of Invention
Aiming at the technical problems, the invention provides a Ni-containing alloy steel plate with excellent low-temperature toughness and a production method thereof, and solves the problem of high production cost of the existing 9Ni steel.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention provides a Ni-containing alloy steel plate with excellent low-temperature toughness, which comprises the following components in percentage by mass: 0.04 to 0.10 percent of C, 0.05 to 0.30 percent of Si, 0.80 to 1.20 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.05 percent of S, 7.0 to 8.0 percent of Ni0, 0.020 to 0.050 percent of Al, 0.2 to 0.30 percent of Cr, 0.2 to 0.30 percent of Mo, 0.020 to 0.030 percent of Nb, 0.04 to 0.06 percent of V, 0.002 to 0.005 percent of Ca0.005 percent, less than or equal to 0.012 percent of As, less than or equal to 0.015 percent of Sn, less than or equal to 0.003 percent of Sb, and the balance of Fe.
The maximum thickness of the steel plate is 50 mm.
The steel has a low-carbon design, a C content of 0.04-0.10% which is advantageous for improving the toughness of the steel and significantly improving the weldability of the steel, a Si content of 0.05-0.30% which is mainly a solid solution strengthening type to improve the strength of the steel, but not an excessively high content which is not necessary to reduce the toughness of the steel, a Mn content of 0.80-1.20% which is mainly a solid solution strengthening and transformation temperature reducing effect to improve the strength of the steel sheet, Mn content which significantly improves the hardenability of the steel, ductility and low-temperature impact toughness of the steel sheet which slightly decrease with increasing Mn content, and strength which significantly increase with increasing Mn content, P content which is not higher than 0.010% and S content which is not higher than 0.005%, in general, phosphorus and sulfur are harmful elements in the steel, increasing brittleness of the steel, decreasing plasticity, deteriorating cold bending properties, sulfur reduces ductility and toughness of the steel, causing ductility and toughness when rolling, and toughness of the steel are generally, and increasing the contents of phosphorus and sulfur are harmful elements in the steel, and Ni, and are harmful elements, and lead to increase, and lead to the formation of martensite, the martensite transformation resistance of the steel is increased by increasing the steel, the steel surface, the steel is increased by adding the martensite transformation effect of 0.2-0.2C transformation, the steel is increased, the steel has the martensite transformation resistance of the steel is increased, the steel is increased, the steel is increased, the steel toughness of the steel is increased, the steel is increased, the steel toughness of the steel is increased, the steel is increased by the steel.
The invention also provides a production method of the Ni-containing alloy steel plate with excellent low-temperature toughness, which comprises the working procedures of smelting, continuous casting, heating, rolling, cooling and heat treatment, wherein the steel plate adopts the chemical components in percentage by weight.
The rolling procedure adopts a II type controlled rolling process; the rolling temperature of the first stage is 950-1100 ℃, the pass reduction rate is more than or equal to 15 percent, and the accumulated reduction rate is more than or equal to 50 percent; the second stage of finish rolling is performed at the beginning of less than or equal to 850 ℃, the finish rolling temperature is less than or equal to 810 ℃, the accumulated reduction rate is more than or equal to 50 percent, and a semi-finished steel plate is obtained after rolling;
the cooling step: the water cooling temperature of the semi-finished steel plate is 780-800 ℃, and stacking and slow cooling are carried out after water cooling; the stacking temperature is more than or equal to 200-250 ℃, and the stacking slow cooling time is more than or equal to 24 hours;
the heat treatment step: quenching and tempering the steel plate in a double-phase region after cooling; quenching temperature is 720 +/-10 ℃, heating time of quenching is 2.5min/mm respectively, and water cooling is carried out; tempering temperature is 560 +/-10 ℃, total heating time is 4min/mm, and air cooling is carried out.
The heating step: the maximum heating temperature of the steel billet is 1150-1180 ℃, the soaking temperature is 1150-1170 ℃, and the total heating time is more than or equal to 12 min/cm.
The continuous casting process comprises the following steps: the continuous casting billet with the section of 300mm is used for production, the continuous casting is ventilated and stacked for slow cooling, and the slow cooling time is more than or equal to 24 hours.
The continuous casting process comprises the following steps: the casting temperature is 1560-1580 ℃, the superheat degree is 15-30 ℃, and the throwing speed is 0.70-1.05 m/min.
The smelting process comprises the following steps: smelting the raw materials by an electric furnace or a converter, sending the raw materials into an LF ladle furnace for refining, deeply desulfurizing, adjusting alloy components, adding Nb and V for microalloying, feeding an Al wire for 600-750 meters, hoisting a bale to a VD furnace for vacuum treatment when the temperature of the bale is more than or equal to 1600 ℃, adding 100-150 kg of Ca-Si blocks before vacuum, the vacuum degree is less than or equal to 60Pa, and breaking the vacuum after the vacuum retention time is more than or equal to 15 minutes.
The production method of the invention solves the problems in the production process of the 9Ni steel: (1) alloying design: the Ni content in the 9Ni steel is reduced, and the defects of low-temperature toughness and strength can be made up by adding a small amount of alloy elements such as Cr, Mo, microalloying and the like, so that the manufacturing cost is reduced on the premise of ensuring the performance of the steel; (2) the low-temperature controlled rolling and direct quenching process is adopted, so that the low-temperature toughness and other mechanical properties of the Ni-containing steel are obviously improved, and the production cost is reduced; (3) quenching and tempering are carried out in a two-phase region, so as to ensure low-temperature toughness and other mechanical properties.
In the method, the chemical composition of the steel plate is designed by adopting Ni as a main element for improving the impact toughness of the steel plate at the low temperature of-196 ℃, and simultaneously adding a small amount of Cr and Mo and adopting microalloyed Nb, V and Ca; the continuous casting process is adopted for production, so that the cost is low and the market competitiveness is strong; and a steel airing rolling control and cooling control process is adopted during rolling, so that excellent comprehensive performance is ensured. The low-temperature toughness of the steel plate obtained by the method has quite large allowance, and the transverse impact energy at the temperature of-196 ℃ at the plate thickness of 1/4 and 1/2 is more than 150J; the Z-direction performance is excellent, the requirement of the highest level Z35 can be met, and a large margin is provided; the steel sheet obtained had a uniform and fine structure and very fine non-metallic inclusions, and had a grain size of 8.0 grade or more at a sheet thickness of 1/4 and a grain size of 7.5 grade or more at a sheet thickness of 1/2.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the invention has good low-temperature impact toughness; the C content is extremely low, so that the welding property is good; the Z-direction performance is excellent and can reach the highest Z35 level; can be widely used for manufacturing low-temperature equipment and has wide application prospect.
The method adopts low-carbon equivalent trace multielement component design and a production process of controlled rolling, controlled cooling and heat treatment to produce the continuous casting type Ni-containing alloy steel plate with the thickness of 10-50 mm meeting the requirement of a low-temperature pressure container; the product has high purity, uniform components and excellent mechanical property; excellent transverse impact energy at minus 196 ℃, excellent welding performance and the like; and the process is simple, the production cost is low, and batch production can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a metallographic structure photograph of a Ni-containing alloy steel sheet according to example 1;
FIG. 2 is a metallographic structure photograph of a Ni-containing alloy steel sheet according to example 2;
FIG. 3 is a metallographic structure photograph of a Ni-containing alloy steel sheet according to example 3.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The low-temperature toughness Ni-containing alloy steel plate is produced by the following process method.
(1) Smelting: smelting the raw materials by an electric furnace or a converter, sending the raw materials into an LF ladle furnace for refining, deeply desulfurizing, adjusting alloy components, adding Nb and V for microalloying, feeding an Al wire for 600-750 meters, hoisting a bale to a VD furnace for vacuum treatment when the temperature of the bale is more than or equal to 1600 ℃, adding 100-150 kg of Ca-Si blocks before vacuum, the vacuum degree is less than or equal to 60Pa, and breaking the vacuum after the vacuum retention time is more than or equal to 15 minutes. The weight percentage of the components of the obtained molten steel is as follows: 0.04 to 0.10 percent of C, 0.05 to 0.30 percent of Si, 0.80 to 1.20 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.05 percent of S, 7.0 to 8.0 percent of Ni, 0.020 to 0.050 percent of Al, 0.2 to 0.30 percent of Cr, 0.2 to 0.30 percent of Mo0.020 to 0.030 percent of Nb, 0.04 to 0.06 percent of V, 0.002 to 0.005 percent of Ca0.005 percent, less than or equal to 0.012 percent of As, less than or equal to 0.015 percent of Sn, less than or equal to 0.003 percent of Sb, and the balance of Fe and trace.
(2) And (3) continuous casting process: casting the molten steel at 1560-1580 ℃ by adopting a continuous casting billet with a section of 300mm, wherein the superheat degree is 15-30 ℃, and the throwing speed is 0.70-1.05 m/min to obtain the continuous casting billet; and (4) carrying out wind shielding, stacking and slow cooling on the continuous casting billets, wherein the slow cooling time is more than or equal to 24 hours.
(3) A heating procedure: putting the continuous casting billet into a continuous furnace for heating; in order to ensure the surface quality of the steel plate, the casting blank realizes warm-cleaning, warm-loading and low-temperature heating at a slow speed, the highest heating temperature of the steel blank is 1150-1180 ℃, the soaking temperature is 1150-1170 ℃, and the total heating time is more than or equal to 12min/cm (namely, the total heating time is calculated according to the heating time of 1 minute per centimeter of the thickness of the steel blank).
(4) A rolling procedure: adopting a type II controlled rolling process; the first stage is austenite recrystallization stage, the pass reduction rate is more than or equal to 15% at 950-1100 ℃, the accumulated reduction rate is more than or equal to 50%, and austenite is completely recrystallized to refine austenite grains; the second stage is an austenite non-recrystallization stage, the initial rolling temperature is less than or equal to 850 ℃, the final rolling temperature is less than or equal to 810 ℃, in the stage, austenite grains are elongated, and high-density deformation twin crystals and deformation bands are formed in the elongated unrecrystallized austenite, so that the nucleation positions of ferrite are increased, the ferrite grains are refined, the reduction rate in the stage is as large as possible, the cumulative reduction rate is more than or equal to 50%, and the semi-finished steel plate is obtained after rolling.
(5) A cooling process: adopting water cooling and hot stacking processes; the rolled steel plate is cooled on line in a quick cooling device, the water cooling temperature is 780-800 ℃, and stacking and slow cooling are carried out after water cooling; the stacking temperature is more than or equal to 200-250 ℃, the stacking slow cooling time is more than or equal to 24 hours, and the internal cracks of the steel plate are prevented from being formed due to untimely release of the internal stress.
(6) A heat treatment process: carrying out double-phase zone quenching and tempering treatment on the steel plate; quenching temperature is 720 +/-10 ℃, heating time of quenching is 2.5min/mm (namely calculated according to heating time of 2.5 minutes per millimeter of the thickness of the steel plate), and water cooling is carried out; tempering temperature is 560 +/-10 ℃, total heating time is 4min/mm (namely heating for 4 minutes per millimeter of thickness of the steel plate), and air cooling is carried out; thus obtaining the Ni-containing steel plate.
Example 1
The present embodiment provides a Ni-containing alloy steel sheet having excellent low-temperature toughness, including, by mass: 0.08% of C, 0.21% of Si, 0.94% of Mn, 0.005% of P, 0.003% of S, 7.43% of Ni, 0.036% of Al, 0.24% of Cr0, 0.26% of Mo, 0.023% of Nb, 0.043% of V, 0.003% of Ca, 0.008% of As, 0.003% of Sn, 0.002% of Sb0.002% of the balance of Fe and trace inevitable impurities.
The method for producing a Ni-alloy-containing steel sheet having excellent low-temperature toughness of the present example includes the steps of:
(1) smelting: feeding 650 m A1 wire during refining, hoisting the bale to a VD furnace for vacuum treatment when the temperature of the bale is more than or equal to 1600 ℃, adding 120kg Ca-Si blocks before vacuum treatment and keeping the vacuum degree at 60Pa for 18 minutes.
(2) Continuous casting: casting the molten steel at 1560-1580 ℃, wherein the superheat degree is 24 ℃, and the throwing speed is 0.75 m/min; and (4) carrying out wind shielding, stacking and slow cooling on the continuous casting billets, wherein the slow cooling time is 26 hours.
(3) Heating: putting the continuous casting billet into a continuous furnace for heating; in order to ensure the surface quality of the steel plate, the casting blank realizes warm-cleaning, warm-loading and low-temperature heating at a slow speed, the maximum heating temperature of the steel blank is 1180 ℃, the soaking temperature is 1150-1170 ℃, and the total heating time is 6 hours (12 min/cm).
(4) Rolling: adopting a II type pressure control process; the rolling temperature of the first stage is 980 ℃, the pass reduction rate is 18 percent, and the cumulative reduction rate is 55 percent; the rolling temperature of the second stage is 845 ℃, the finishing temperature is 800 ℃, and the cumulative reduction rate is 60%.
(5) A cooling process: adopting water cooling and hot stacking processes; cooling the rolled steel plate on line in a quick cooling device at the starting water cooling temperature of 790 ℃, and stacking and slowly cooling the steel plate after water cooling; the stacking temperature is 230 ℃, and the stacking slow cooling time is 25 hours.
(6) And (3) heat treatment: performing double-phase quenching and tempering treatment on the steel plate; the quenching temperature of the two-phase region is 730 ℃, and the total heating time is 75min (2.5 min/mm); the tempering temperature is 560 ℃ and the total heating time is 120min (4 min/mm).
The thickness of the Ni-containing alloy steel plate obtained in the embodiment is 30mm, and the mechanical properties are as follows: the yield strength is 635MPa, the tensile strength is 720MPa, and the elongation is 27%; -196 ℃ lateral impact work: 218J, 221J, 232J. The metallographic structure photograph of the Ni alloy-containing steel sheet of this example is shown in fig. 1.
Example 2
The present embodiment provides a Ni-containing alloy steel sheet having excellent low-temperature toughness, including, by mass: 0.04% of C, 0.30% of Si, 0.80% of Mn, 0.010% of P, 0.02% of S, 8.0% of Ni, 0.020% of Al, 0.3% of Cr, 0.2% of Mo0.030% of Nb, 0.04% of V, 0.005% of Ca, 0.012% of As, 0.003% of Sn, 0.003% of Sb0.003% of Fe and the balance of trace inevitable impurities.
The method for producing a Ni-alloy-containing steel sheet having excellent low-temperature toughness of the present example includes the steps of:
(1) smelting: feeding an A1 wire 600 m during refining, hoisting the bale to a VD furnace for vacuum treatment when the temperature of the bale is more than or equal to 1600 ℃, adding 150kg of Ca-Si blocks before vacuum treatment and keeping the vacuum degree at 50Pa for 15 minutes.
(2) Continuous casting: casting the molten steel at 1560-1580 ℃, wherein the superheat degree is 15 ℃, and the throwing speed is 0.70 m/min; and (4) carrying out wind shielding, stacking and slow cooling on the continuous casting billets, wherein the slow cooling time is 24 hours.
(3) Heating: putting the continuous casting billet into a continuous furnace for heating; in order to ensure the surface quality of the steel plate, the casting blank realizes warm-cleaning, warm-loading and low-temperature heating at a slow speed, the maximum heating temperature of the steel blank is 1150 ℃, the soaking temperature is 1150-1170 ℃, and the total heating time is 6.2 hours (12.4 min/cm).
(4) Rolling: adopting a II type pressure control process; the rolling temperature of the first stage is 950 ℃, the pass reduction rate is 15 percent, and the cumulative reduction rate is 56 percent; the rolling temperature of the second stage is 850 ℃, the finishing temperature is 810 ℃, and the cumulative reduction rate is 50%.
(5) A cooling process: adopting water cooling and hot stacking processes; carrying out on-line cooling on the rolled steel plate in a quick cooling device, wherein the water cooling temperature is 780 ℃, and stacking and slow cooling are carried out after water cooling; the stacking temperature is 200 ℃, and the stacking slow cooling time is 24 hours.
(6) And (3) heat treatment: performing double-phase quenching and tempering treatment on the steel plate; the quenching temperature of the two-phase region is 710 ℃, and the total heating time is 125min (2.5 min/mm); the tempering temperature is 570 ℃, and the total heating time is 200min (4 min/mm).
The thickness of the Ni-containing alloy steel plate obtained in the embodiment is 50mm, and the mechanical properties are as follows: the yield strength is 625MPa, the tensile strength is 715MPa, and the elongation is 28%; -196 ℃ lateral impact work: 234J, 203J, 234J; reduction of area in thickness direction: 75%, 77% and 75%. The metallographic structure photograph of the Ni alloy-containing steel sheet of this example is shown in fig. 2.
Example 3
The present embodiment provides a Ni-containing alloy steel sheet having excellent low-temperature toughness, including, by mass: 0.10% of C, 0.05% of Si, 1.20% of Mn, 0.008% of P, 0.05% of S, 7.0% of Ni, 0.050% of Al, 0.2% of Cr, 0.3% of Mo0.020% of Nb, 0.06% of V, 0.002% of Ca, 0.009% of As, 0.015% of Sn, 0.002% of Sb and the balance of Fe and trace inevitable impurities.
The method for producing a Ni-alloy-containing steel sheet having excellent low-temperature toughness of the present example includes the steps of:
(1) smelting: feeding A1 wire 750 meters during refining, hoisting the bale to a VD furnace for vacuum treatment when the temperature of the bale is more than or equal to 1600 ℃, adding 100kg of Ca-Si block before vacuum treatment and keeping the vacuum degree at 60Pa for 20 minutes.
(2) Continuous casting: casting the molten steel at 1560-1580 ℃, wherein the superheat degree is 30 ℃, and the throwing speed is 1.05 m/min; and (4) carrying out wind shielding, stacking and slow cooling on the continuous casting billets, wherein the slow cooling time is 28 hours.
(3) Heating: putting the continuous casting billet into a continuous furnace for heating; in order to ensure the surface quality of the steel plate, the casting blank is heated at low temperature, namely 1180 ℃ at the highest heating temperature of the steel blank, 1150-1170 ℃ at the soaking temperature and 15min/cm for the total heating time.
(4) Rolling: adopting a II type pressure control process; the rolling temperature of the first stage is 1100 ℃, the pass reduction rate is 16 percent, and the cumulative reduction rate is 58 percent; the rolling temperature of the second stage is 830 ℃, the finishing temperature is 800 ℃, and the cumulative reduction rate is 55%.
(5) A cooling process: adopting water cooling and hot stacking processes; carrying out on-line cooling on the rolled steel plate in a quick cooling device, wherein the water cooling temperature is 800 ℃, and stacking and slow cooling are carried out after water cooling; the stacking temperature is 250 ℃, and the stacking slow cooling time is 26 hours.
(6) And (3) heat treatment: performing double-phase quenching and tempering treatment on the steel plate; the quenching temperature of the two-phase region is 730 ℃, and the total heating time is 26min (2.5 min/mm); the tempering temperature is 550 ℃ and the total heating time is 42min (4 min/mm).
The thickness of the Ni-containing alloy steel plate in the embodiment is 10mm, and the mechanical properties are as follows: the yield strength is 680MPa, the tensile strength is 720MPa, and the elongation is 23%; -196 ℃ lateral impact work: 178J, 167J, 172J. The metallographic structure photograph of the Ni alloy-containing steel sheet of this example is shown in fig. 3.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A Ni-containing alloy steel sheet having excellent low-temperature toughness, characterized by comprising the following components in mass percent: 0.04 to 0.10 percent of C, 0.05 to 0.30 percent of Si, 0.80 to 1.20 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.05 percent of S, 7.0 to 8.0 percent of Ni, 0.020 to 0.050 percent of Al, 0.2 to 0.30 percent of Cr, 0.2 to 0.30 percent of Mo, 0.020 to 0.030 percent of Nb, 0.04 to 0.06 percent of V, 0.002 to 0.005 percent of Ca, less than or equal to 0.012 percent of As, less than or equal to 0.015 percent of Sn, less than or equal to 0.003 percent of Sb, and the balance of Fe and trace inevitable impurities.
2. The Ni-containing alloy steel sheet having excellent low-temperature toughness according to claim 1, characterized in that: the maximum thickness of the steel plate is 50 mm.
3. A method for producing a Ni-containing alloy steel sheet having excellent low-temperature toughness as set forth in claim 1 or 2, characterized in that: comprises the working procedures of smelting, continuous casting, heating, rolling, cooling and heat treatment.
4. The method for producing a Ni-containing alloy steel sheet having excellent low-temperature toughness according to claim 3, characterized in that: the rolling procedure adopts a II type controlled rolling process; the rolling temperature of the first stage is 950-1100 ℃, the pass reduction rate is more than or equal to 15 percent, and the accumulated reduction rate is more than or equal to 50 percent; the second stage of finish rolling is performed at the beginning of less than or equal to 850 ℃, the finish rolling temperature is less than or equal to 810 ℃, the accumulated reduction rate is more than or equal to 50 percent, and a semi-finished steel plate is obtained after rolling;
the cooling step: the water cooling temperature of the semi-finished steel plate is 780-800 ℃, and stacking and slow cooling are carried out after water cooling; the stacking temperature is more than or equal to 200-250 ℃, and the stacking slow cooling time is more than or equal to 24 hours;
the heat treatment step: quenching and tempering the steel plate in a double-phase region after cooling; quenching temperature is 720 +/-10 ℃, heating time of quenching is 2.5min/mm respectively, and water cooling is carried out; tempering temperature is 560 +/-10 ℃, total heating time is 4min/mm, and air cooling is carried out.
5. The method for producing a Ni-containing alloy steel sheet having excellent low-temperature toughness according to claim 3, characterized in that: the heating step: the maximum heating temperature of the steel billet is 1150-1180 ℃, the soaking temperature is 1150-1170 ℃, and the total heating time is more than or equal to 12 min/cm.
6. The method for producing a Ni-containing alloy steel sheet having excellent low-temperature toughness according to claim 3, characterized in that: the continuous casting process comprises the following steps: the continuous casting billet with the section of 300mm is used for production, the continuous casting is ventilated and stacked for slow cooling, and the slow cooling time is more than or equal to 24 hours.
7. The method for producing a Ni-alloy-containing steel sheet having excellent low-temperature toughness according to claim 6, wherein the casting temperature in the continuous casting step is 1560 ℃ to 1580 ℃, the degree of superheat is 15 ℃ to 30 ℃, and the withdrawal rate is 0.70 to 1.05 m/min.
8. The method for producing a Ni-containing alloy steel sheet having excellent low-temperature toughness according to claim 3, characterized in that the smelting process: smelting the raw materials by an electric furnace or a converter, sending the raw materials into an LF ladle furnace for refining, deeply desulfurizing, adjusting alloy components, adding Nb and V for microalloying, feeding an Al wire for 600-750 meters, hoisting a bale to a VD furnace for vacuum treatment when the temperature of the bale is more than or equal to 1600 ℃, adding 100-150 kg of Ca-Si blocks before vacuum, the vacuum degree is less than or equal to 60Pa, and breaking the vacuum after the vacuum retention time is more than or equal to 15 minutes.
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| CN113667897A (en) * | 2021-08-31 | 2021-11-19 | 重庆钢铁股份有限公司 | Low-temperature toughness steel and P, As matching process thereof |
| CN115261719A (en) * | 2022-05-14 | 2022-11-01 | 江阴市中岳机锻有限公司 | Low-temperature-resistant bow outer shaft sleeve and machining process thereof |
| CN116377343A (en) * | 2022-12-14 | 2023-07-04 | 鞍钢股份有限公司 | Marine engineering steel plate serving in polar region marine environment and manufacturing method thereof |
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| CN104520461A (en) * | 2013-06-19 | 2015-04-15 | 新日铁住金株式会社 | Steel material, process for producing same, and LNG tank |
| EP3081662A1 (en) * | 2013-12-12 | 2016-10-19 | JFE Steel Corporation | Steel sheet and method for manufacturing same |
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| CN113667897A (en) * | 2021-08-31 | 2021-11-19 | 重庆钢铁股份有限公司 | Low-temperature toughness steel and P, As matching process thereof |
| CN115261719A (en) * | 2022-05-14 | 2022-11-01 | 江阴市中岳机锻有限公司 | Low-temperature-resistant bow outer shaft sleeve and machining process thereof |
| CN116377343A (en) * | 2022-12-14 | 2023-07-04 | 鞍钢股份有限公司 | Marine engineering steel plate serving in polar region marine environment and manufacturing method thereof |
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