CN116240470B - Production method of super-thick steel plate with strength of more than 690MPa - Google Patents
Production method of super-thick steel plate with strength of more than 690MPa Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 59
- 238000009749 continuous casting Methods 0.000 claims abstract description 13
- 238000005266 casting Methods 0.000 claims abstract description 12
- 238000010791 quenching Methods 0.000 claims abstract description 7
- 230000000171 quenching effect Effects 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 11
- 238000005496 tempering Methods 0.000 claims description 9
- 238000007711 solidification Methods 0.000 claims description 8
- 230000008023 solidification Effects 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 238000011946 reduction process Methods 0.000 claims description 2
- 238000005204 segregation Methods 0.000 abstract description 3
- 230000035515 penetration Effects 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- 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
- C21D8/02—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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- 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
- C21D8/02—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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- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- 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
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- 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
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
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- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- 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
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Abstract
The production method of the super-thick steel plate with the strength of more than 690MPa comprises the following chemical components of, by weight, C=0.08-0.12%, si=0.20-0.30%, mn=1.40-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, nb=0.030-0.040%, cr=0.50-0.60%, ni=0.30-0.40%, mo=0.30-0.40%, W=0.1-0.2%, B=0.0020-0.0025%, ALT=0.10-0.12%, and the balance of Fe and unavoidable impurities. The invention solves the problems of loose center, shrinkage cavity and segregation of the casting blank of the large single-weight extra-thick plate produced by continuous casting, solves the problem of insufficient penetration of rolling force along the thickness direction and core deformation in the thick plate rolling process by utilizing the temperature gradient rolling and the three-stage control rolling and on-line quenching, can produce the steel plate with the thickness of more than or equal to 100mm and the strength of more than 690MPa by adopting the large single-weight continuous casting, has short production period and low manufacturing cost, and is suitable for the mass production of thick plates.
Description
Technical Field
The invention belongs to the technical field of extra-thick plate production, and particularly relates to a production method of a large single extra-thick plate.
Background
The ultra-thick plate is widely applied to various fields of cross-sea bridges, military industry, shipbuilding, nuclear power, chemical industry, large machinery, hydropower stations, ocean engineering and the like, so that the demand of the ultra-thick plate is continuously increased. Because of the wide application field of the extra thick plate, the performance requirements of the extra thick plate, such as strength, toughness, Z-direction performance, weldability, corrosiveness and the like, are also put forward higher requirements on the production process. The traditional method for producing the extra-thick plate with the thickness not smaller than 100mm is die casting, cogging and rolling, and has the problems of high energy consumption, heavy pollution, low yield and the like.
The production of extra thick plates by large-section continuous casting billets has become a development trend for producing extra thick plates economically and in energy conservation, but the core of the casting billets produced by adopting continuous casting billets often has the defects of component segregation, loose shrinkage cavity, bubbles and the like, and can not completely disappear in the rolling process, sometimes even become cracks, so that the quality of the core is deteriorated. Therefore, improving the quality of the core is a critical problem in the production process of extra thick plates. In the process of rolling an ultra-thick plate, the temperature is unevenly distributed in the thickness of the steel plate due to the temperature cross-section effect, thereby causing the phase change difference between the surface and the core of the steel plate. Both the variable cross-section effect and the temperature cross-section effect cause non-uniformity in the performance of the ultra-thick plate. The thicker the steel plate, the more obvious the cross-sectional effect, and the more important it is to raise the core strain in the rolling process.
At present, steel enterprises capable of producing casting blanks with the thickness of more than 400mm generally encounter the problems that the rolling compression ratio of ultra-thick steel plates is small, the performance of the steel plates is unstable, particularly the central performance of the thick steel plates, such as the Z-direction performance of thick plates, and the key technology for producing high-strength ultra-thick plates by utilizing large-tonnage continuous casting blanks is urgently broken through.
Disclosure of Invention
The invention aims to provide a production method of an extra-thick plate with strength larger than 690MPa, which aims to solve the bottleneck of an extra-thick plate produced by a large single continuous casting blank, adopts a continuous casting blank with a section of 450mm multiplied by 2500mm to produce a steel plate with thickness larger than or equal to 100mm, and obtains the high-strength extra-thick steel plate with excellent toughness through temperature gradient rolling, three-stage controlled rolling, on-line quenching and off-line tempering processes. The yield strength of the steel plate is more than or equal to 690MPa, the tensile strength is more than or equal to 770MPa, the impact toughness at the wall thickness of 1/2 to 40 ℃ is more than or equal to 120J, the thickness stretching is more than 40%, and the lamellar tearing resistance is good.
The implementation scheme of the invention is as follows:
the production method of the super-thick steel plate with the strength of more than 690MPa comprises the following chemical components of, by weight, C=0.08-0.12%, si=0.20-0.30%, mn=1.40-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, nb=0.030-0.040%, cr=0.50-0.60%, ni=0.30-0.40%, mo=0.30-0.40%, W=0.1-0.2%, B=0.0020-0.0025%, ALT=0.10-0.12%, and the balance of Fe and unavoidable impurities. The key process steps comprise:
(1) Continuous casting: the section of the casting blank is 450X 2500mm, the whole-process protection casting is performed, the superheat degree is controlled at 10-20 ℃, the pulling speed is controlled at 0.3-0.6 m/min, the electromagnetic stirring current is 260-300A, the soft reduction is 3-5 mm by adopting a reduction process combining dynamic soft reduction and solidification end heavy reduction, and the solidification end heavy reduction is 10-12 mm;
(2) Heating: the heating temperature is 1100-1250 ℃ and the heating time is 350-500 min;
(3) Rolling: adopting a temperature gradient rolling, three-stage controlled rolling and online quenching controlled rolling and cooling process, wherein the thickness of a blank to be heated is 180-220 mm; the finishing temperature of the first-stage rolling is 980-1000 ℃, water is cooled to 840-870 ℃ after rolling, and the temperature difference between the surface and the core of the blank to be heated is controlled to 80-100 ℃; the initial rolling temperature of the two stages is 810-840 ℃, rolling is carried out for 3-5 times, and air cooling is carried out for 50-80 s; the initial rolling temperature of three stages is 780-790 ℃, the final rolling temperature is 750-760 ℃, and the rolling is quickly cooled to below Ms line;
(4) Tempering: the tempering process temperature is 600-650 ℃, the heat preservation time is 3.5 Xh min, and h is the thickness of the steel plate wall mm.
The invention solves the problems of loose center, shrinkage cavity and segregation of the casting blank of the large single-weight extra-thick plate produced by continuous casting, solves the problem of insufficient penetration of rolling force along the thickness direction and core deformation in the thick plate rolling process by utilizing the temperature gradient rolling and the three-stage control rolling and on-line quenching, can produce the steel plate with the thickness of more than or equal to 100mm and the strength of more than 690MPa by adopting the large single-weight continuous casting, has short production period and low manufacturing cost, and is suitable for the mass production of thick plates.
Drawings
FIG. 1 is a metallographic structure diagram of a steel plate.
Detailed Description
The present invention will be further described with reference to examples.
Example 1
Production of 100mm extra thick steel plates. The chemical composition content c=0.10%, si=0.25%, mn=1.42%, p=0.010%, s=0.002%, nb=0.032%, cr=0.54%, ni=0.36%, mo=0.33%, w=0.18%, b=0.0022%, alt=0.11%, the balance being Fe and unavoidable impurities. The key process steps are as follows:
(1) Continuous casting: the section of the casting blank is 450 multiplied by 2500mm, the whole process is used for protection casting, the superheat degree is controlled to 15 ℃, the pulling speed is controlled to 0.38m/min, the electromagnetic stirring current is 280A, a pressing technology combining dynamic soft pressing and solidification end heavy pressing is adopted, the soft pressing is 3.5mm, and the solidification end heavy pressing is 11mm;
(2) Heating: the heating temperature is 1100-1230 ℃ and the heating time is 426min;
(3) Rolling: adopting a temperature gradient rolling, three-stage controlled rolling and online quenching controlled rolling and cooling process, wherein the thickness of a warm blank is 180mm, the temperature at the end of one-stage rolling is 985 ℃, water is cooled to 860 ℃ after rolling, the temperature difference between the surface and the core of the warm blank is controlled to 89 ℃, the two-stage initial rolling temperature is 840 ℃, rolling is carried out for 5 times, air cooling is carried out for 60s, three-stage initial rolling is 790 ℃, the temperature of three-stage final rolling is 758 ℃, and rapid cooling is adopted to be below Ms line after rolling;
(4) Tempering: tempering process is carried out at 630 ℃ for 350min.
The results of the performance tests are shown in Table 1.
Example 2
Production of 160mm extra thick steel plates. The chemical composition content c=0.09%, si=0.26%, mn=1.42%, p=0.012%, s=0.001%, nb=0.036%, cr=0.52%, ni=0.32%, mo=0.35%, w=0.16%, b=0.0024%, alt=0.12%, the balance being Fe and unavoidable impurities. The key process steps are as follows:
(1) Continuous casting: the section of the casting blank is 450 multiplied by 2500mm, the whole process is used for protection casting, the superheat degree is controlled to be 16 ℃, the pulling speed is controlled to be 0.38m/min, the electromagnetic stirring current is 288A, a pressing technology combining dynamic soft pressing and solidification end heavy pressing is adopted, the soft pressing is 3mm, and the solidification end heavy pressing is 10mm;
(2) Heating: the heating temperature is 1100-1200 ℃ and the heating time is 450min;
(3) Rolling: adopting a temperature gradient rolling, three-stage controlled rolling and online quenching controlled rolling and cooling process, wherein the thickness of a warm blank is 218mm, the finishing temperature of one-stage rolling is 982 ℃, water cooling is carried out to 846 ℃ after rolling, the temperature difference between the surface and the core of the warm blank is controlled at 88 ℃, the two-stage initial rolling temperature is 825 ℃, rolling is carried out for 4 times, air cooling is carried out for 78s, the three-stage initial rolling is 782 ℃, the final rolling temperature of three-stage is 752 ℃, and rapid cooling is carried out to below Ms line after rolling;
(4) Tempering: tempering process is 620 ℃, and the heat preservation time is 560min.
The results of the performance tests are shown in Table 1.
。
Claims (1)
1. A production method of an extra-thick steel plate with strength larger than 690MPa is characterized by comprising the following steps: the steel comprises the following chemical components, by weight, C=0.08-0.12%, si=0.20-0.30%, mn=1.40-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, nb=0.030-0.040%, cr=0.50-0.60%, ni=0.30-0.40%, mo=0.30-0.40%, W=0.1-0.2%, B=0.0020-0.0025%, ALT=0.10-0.12%, and the balance of Fe and unavoidable impurities; the thickness of the steel plate is more than or equal to 100mm, the yield strength is more than or equal to 690MPa, the tensile strength is more than or equal to 770MPa, and the impact toughness at the 1/2 position of the wall thickness at the temperature of minus 40 ℃ is more than or equal to 120J; the key process steps comprise:
(1) Continuous casting: the section of the casting blank is 450X 2500mm, the whole-process protection casting is performed, the superheat degree is controlled at 10-20 ℃, the pulling speed is controlled at 0.3-0.6 m/min, the electromagnetic stirring current is 260-300A, the soft reduction is 3-5 mm by adopting a reduction process combining dynamic soft reduction and solidification end heavy reduction, and the solidification end heavy reduction is 10-12 mm;
(2) Heating: the heating temperature is 1100-1250 ℃ and the heating time is 350-500 min;
(3) Rolling: adopting a temperature gradient rolling, three-stage controlled rolling and online quenching controlled rolling and cooling process, wherein the thickness of a blank to be heated is 180-220 mm; the finishing temperature of the first-stage rolling is 980-1000 ℃, water is cooled to 840-870 ℃ after rolling, and the temperature difference between the surface and the core of the blank to be heated is controlled to 80-100 ℃; the initial rolling temperature of the two stages is 810-840 ℃, rolling is carried out for 3-5 times, and air cooling is carried out for 50-80 s; the initial rolling temperature of three stages is 780-790 ℃, the final rolling temperature is 750-760 ℃, and the rolling is quickly cooled to below Ms line;
(4) Tempering: the tempering temperature is 600-650 ℃, the heat preservation time is 3.5 Xh min, and h is the thickness of the steel plate wall mm.
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