CN102127707A - Ultra-thick steel plate with high strength and high low-temperature toughness and production method thereof - Google Patents
Ultra-thick steel plate with high strength and high low-temperature toughness and production method thereof Download PDFInfo
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Abstract
The invention relates to a method for producing an ultra-thick steel plate with high strength and high low-temperature toughness by adopting a controlled rolling process, in particular to a process for producing a hot rolling steel plate with high strength and high low-temperature toughness in the specification of 40-100mm by utilizing a continuous casting blank with the thickness of 250-300mm. The steel comprises the following chemical components in percentage by weight: 0.10-0.20% of C, 0.15-0.40% of Si, 1.20-1.60% of Mn, less than or equal to 0.015% of S, less than or equal to 0.015% of P, 0.010-0.050% of Nb, 0.25-0.50% of Ni, 0.01-0.02% of Ti and the balance of Fe and trace impurities. The product in the invention is reasonable in chemical composition design, the production process is simple, and the ultra-thick (maximum thickness can reach 100mm) high-quality hot rolled steel plate with high strength (tensile strength is more than 490MPa) and high low-temperature toughness (impact power at the temperature of minus 40 DEG C is more than 100J) can be produced by adopting a reasonable controlled rolling process.
Description
Technical field
The invention belongs to field of steel-making, relate to the method for the high super-thick steel plate of a kind of production intensity high and low temperature toughness, relate in particular to a kind of method that adopts controlled rolling process production high strength, high low-temperature flexibility super-thick steel plate.
Background technology
High strength, high tenacity make the direction of plate property development, especially the steel of some specific installations or region use all wish to have high strength and high low-temperature flexibility, but concerning the bigger steel plate of thickness specification, it is very difficult having high strength and higher low-temperature flexibility simultaneously, the method that a lot of producers all take to roll postheat treatment is come the bigger high strength of production thickness piece lattice, high low temperature flexible steel plate, so, not only increase production cost, but also consumed the more energy.So how research not only can reduce production costs by simple explained hereafter high strength, high low temperature flexible steel plate, simultaneously also low-carbon environment-friendly more is fit to the future products developing direction.
CN101418417A discloses a kind of generous intensity deck of boat steel with a high standard and production technique (application number 200810235729.1) thereof, the weight percent of the chemical ingredients of its steel is: C:0.04%-0.16%, Si :≤0.25%, Mn:1.20%-1.60%, P: S≤0.025% :≤0.025%, Nb:0.020%～0.050%, Ni: Ti≤0.40% :≤0.02%, AL:0.020%～0.060%, N :≤0.012%, by suitable cooling controlling and rolling controlling process, produce high-strength ship plates.What employing was added in this invention is cooling controlling and rolling controlling process, need to carry out water-cooled after rolling, concerning the steel plate of thickness big (more than the 40mm), adopt water-cooled to run into since surface and heart portion to get cooling rate different, the tissue difference that obtains, thereby cause surface of steel plate to there are differences, will influence the use of steel plate, and actual (real) thickness and the performance that adopts this explained hereafter product is not provided in the performance of heart portion.
CN101701326A discloses a kind of thick size high-tensile, high-ductility deck of boat steel and production method thereof (application number 200910213353.9), and this invention is produced high-strength ship plates by the production technique of controlled rolling and controlled cooling+normalizing.What employing was added in this invention is the technology of controlled rolling and controlled cooling+normalizing, roll the back steel plate and need carry out normalizing treatment, and two pyrogene materials, the energy consumption height, technology is complicated.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of employing controlled rolling process production high strength, high low-temperature flexibility super-thick steel plate and production method thereof are provided.Product Chemical Composition of the present invention is reasonable in design, and controlling of production process is simple, production efficiency height, quality product, stable performance.
The chemical ingredients of steel of the present invention is by weight percentage: C:0.10～0.20%, Si:0.15～0.40%, Mn:1.20～1.60%, S≤0.015%, P≤0.015%, Nb:0.010%～0.050%, Ni:0.25%～0.50%, Ti:0.01～0.02%, all the other are Fe and trace impurity.Its product be thickness between 40～100mm, the hot-rolled steel sheet of wide 1500mm～4150mm.Composition of the present invention and production technique are simple, by rational controlled rolling process, and production high strength (tensile strength＞490MPa), high low-temperature flexibility (the high-quality hot-rolled steel sheet of 40 ℃ of ballistic works＞100J), special thick (maximum ga(u)ge can reach 100mm).
Detailed Description Of The Invention
The invention provides the high super-thick steel plate of a kind of intensity high and low temperature toughness, it is characterized in that, the chemical ingredients of steel is by weight percentage: C:0.10～0.20%, Si:0.15～0.40%, Mn:1.20～1.60%, S≤0.015%, P≤0.015%, Nb:0.010%～0.050%, Ni:0.25%～0.50%, Ti:0.01～0.02%, all the other are Fe and trace impurity, product thickness between 40～100mm, the hot-rolled steel sheet of wide 1500mm～4150mm.
Preferably, the chemical ingredients of steel is by weight percentage: C:0.12～0.16%, Si:0.30～0.35%, Mn:1.30～1.40%, S≤0.010%, P≤0.010%, Nb:0.030%～0.040%, Ni:0.30%～0.40%, Ti:0.01～0.02%, all the other are Fe and trace impurity.
The present invention also provides described intensity height, the production method of the super-thick steel plate that low-temperature flexibility is high, process comprises the composition design, smelt, continuous casting, heating, roughing, finish rolling, the chemical ingredients that is characterized in steel is by weight percentage: C:0.10～0.20%, Si:0.15～0.40%, Mn:1.20～1.60%, S≤0.015%, P≤0.015%, Nb:0.010%～0.050%, Ni:0.25%～0.50%, Ti:0.01～0.02%, all the other are Fe and trace impurity, product thickness between 40～100mm, the hot-rolled steel sheet of wide 1500mm～4150mm; The heating of the thick continuously cast bloom of 250～300mm is controlled between 1140 ℃～1250 ℃, heat-up time 300～500Min, tapping temperature is controlled between 1120 ℃～1220 ℃; Roughing extreme trace time temperature is between 1060～1160 ℃, and roughing adopts the 4-7 passage rolling, intermediate blank thickness 120～180mm after the roughing; The finish rolling start rolling temperature is between 780～900 ℃, and finishing temperature is in 750～870 ℃ of scopes, and finish rolling adopts 4～7 passages rolling.
Smelting, continuous casting step that the present invention does not have to describe in detail all adopt prior art.
Preferably, it is rolling that roughing adopts four roll reversing rollers to come and go 4～7 passages, start rolling temperature is between 1100 ℃～1210 ℃, and the temperature when steel is thrown in roughing is that the single pass draft of last 3 passages of roughing is not less than 15% between 1060 ℃～1160 ℃ (roughing extreme trace time temperature).
Preferably, product thickness is between 40～60mm the time, and preferred intermediate blank thickness is 110～130mm; Product thickness is between 60～80mm the time, and preferred intermediate blank thickness is 130～150mm; Product thickness is between 80～90mm the time, and preferred intermediate blank thickness is 150～170mm mm; Product thickness is between 90～100mm the time, and preferred intermediate blank thickness is 160～180mm.Suitably regulate intermediate blank thickness, depressing of austenite recrystallization stage and non-recrystallization stage carried out properly distributed, thus the advantage of performance controlled rolling process, and it is tiny to obtain crystal grain, well behaved thick steel plates product.
Preferably, controlled rolling is adopted in finish rolling, guarantees start rolling temperature at 780～900 ℃, and finishing temperature is in 750～870 ℃ of scopes.
Beneficial effect
The inventive method is controlled between 1140 ℃ one 1250 ℃ the continuously cast bloom heating, is no less than 300Min heat-up time, for the steel grade alloying element is fully dissolved and effective banded structure that is caused by the chemical ingredients segregation of eliminating.By rational controlled rolling process, the strict control intermediate blank thickness and the temperature in finish rolling stage realize the production of high strength, the special thick high-quality hot-rolled steel sheet of high low-temperature flexibility; Make the thickness specification between 40mm～100mm, the mechanical property of the hot-rolled steel sheet of wide 1500mm～4150mm is: yield strength all reaches more than the 390Mp, and tensile strength is all above 500Mpa, and unit elongation is greater than 20%, and-40 ℃ of ballistic works are greater than 100J, and clod wash is qualified.The production technique of this steel is very simple, one-heating forming, and less energy consumption, production cost is low, and tissue is produced easily.The steel plate that rolls out has high strength, high low-temperature flexibility, high-ductility, good excellent comprehensive performances such as welding property, be specially adapted to equipment or engineering machinery that industry such as weight handling equipment, mining machinery, motor, boiler, oil, chemical industry, shipbuilding, bridge and low temp area use, have the very strong market competitiveness, can bring huge economic benefit and social benefit for enterprise.
Embodiment
Below in conjunction with embodiment the present invention is further described, but is not limited thereto.
Embodiment 1: industrial EH36 deck of boat steel
Converter smelting EH36 deck of boat steel, the weight percent of the chemical ingredients of steel is: C:0.16%, Si:0.36%, Mn:1.38%, S:0.002%, P:0.011%, Nb:0.033%, Ni:0.30%, Ti:0.018%, with conventional continuous cast method steel is cast into the thick continuous casting steel billet of 300mm, slab is delivered on the 4300mm wide and heavy plate mill and is rolled, and heating, the rolling whole process of carrying out are controlled.
The hot rolling technology controlling and process is as follows:
A, control continuous casting steel billet heating, heating is controlled at 1200 ℃, heat-up time 340Min, tapping temperature is 1193 ℃; B, slab carry out roughing at 1170 ℃, and it is rolling that roughing adopts 6 passages to come and go, and it is 1141 ℃ that roughing finishes back steel temperature.Intermediate blank thickness is 150mm after the roughing; D, finish rolling start rolling temperature are 857 ℃; It is rolling that e, finish rolling adopt 6 passages to come and go; G, finish rolling end temp are 840 ℃; Roll the back and adopt air cooling.
Gained hot-rolled steel thickness of slab 80mm, width 2600mm; The mechanical property of steel plate is: yield strength: 460MPa, and tensile strength: 602MPa, unit elongation: 23.7%, ballistic work (40 ℃): 108J, cold-bending property is qualified.
Embodiment 2: industrial EH36 deck of boat steel
Converter smelting EH36 deck of boat steel, the weight percent of the chemical ingredients of steel is: C:0.15%, Si:0.33%, Mn:1.39%, S:0.002%, P:0.013%, Nb:0.036%, Ni:0.31%, Ti:0.012%, with conventional continuous cast method steel is cast into the thick continuous casting steel billet of 300mm, slab is delivered on the 4300mm wide and heavy plate mill and is rolled, and heating, the rolling whole process of carrying out are controlled.The hot rolling technology controlling and process is as follows:
The hot rolling technology controlling and process is as follows:
A, control continuous casting steel billet heating, heating is controlled at 1200 ℃, heat-up time 335Min, tapping temperature is 1190 ℃; B, slab carry out roughing at 1170 ℃, and it is rolling that roughing adopts 6 passages to come and go, and it is 1125 ℃ that roughing finishes back steel temperature.Intermediate blank thickness is 120mm after the roughing; D, finish rolling start rolling temperature are 851 ℃; It is rolling that e, finish rolling adopt 6 passages to come and go; G, finish rolling end temp are 826 ℃; Roll the back and adopt air cooling.
Gained hot-rolled steel thickness of slab 60mm, width 2800mm; The mechanical property of steel plate is: yield strength: 460MPa, and tensile strength: 570MPa, unit elongation: 26.2%, ballistic work (40 ℃): 123J, cold-bending property is qualified.
Embodiment 3: industrial EH36 deck of boat steel
Converter smelting EH36 deck of boat steel, the weight percent of the chemical ingredients of steel is: C:0.15%, Si:0.34%, Mn:1.37%, S:0.002%, P:0.011%, Nb:0.035%, Ni:0.31%, Ti:0.014%, with conventional continuous cast method steel is cast into the thick continuous casting steel billet of 300mm, slab is delivered on the 4300mm wide and heavy plate mill and is rolled, and heating, the rolling whole process of carrying out are controlled.The hot rolling technology controlling and process is as follows:
The hot rolling technology controlling and process is as follows:
A, control continuous casting steel billet heating, heating is controlled at 1185 ℃, heat-up time 320Min, tapping temperature is 1170 ℃; B, slab carry out roughing at 1140 ℃, and it is rolling that roughing adopts 6 passages to come and go, and it is 1090 ℃ that roughing finishes back steel temperature.Intermediate blank thickness is 120mm after the roughing; D, finish rolling start rolling temperature are 854 ℃; It is rolling that e, finish rolling adopt 6 passages to come and go; G, finish rolling end temp are 828 ℃; Roll the back and adopt air cooling.
Gained hot-rolled steel thickness of slab 45mm, width 3200mm; The mechanical property of steel plate is: yield strength: 515MPa, and tensile strength: 622MPa, unit elongation: 20.2%, ballistic work (40 ℃): 119J, cold-bending property is qualified.
Embodiment 4: industrial EH36 deck of boat steel
Converter smelting EH36 deck of boat steel, the weight percent of the chemical ingredients of steel is: C:0.14%, Si:0.34%, Mn:1.40%, S:0.002%, P:0.011%, Nb:0.027%, Ni:0.307%, Ti:0.011%, with conventional continuous cast method steel is cast into the thick continuous casting steel billet of 300mm, slab is delivered on the 4300mm wide and heavy plate mill and is rolled, and heating, the rolling whole process of carrying out are controlled.The hot rolling technology controlling and process is as follows:
The hot rolling technology controlling and process is as follows:
A, control continuous casting steel billet heating, heating is controlled at 1202 ℃, heat-up time 334Min, tapping temperature is 1194 ℃; B, slab carry out roughing at 1140 ℃, and it is rolling that roughing adopts 5 passages to come and go, and it is 1090 ℃ that roughing finishes back steel temperature.Intermediate blank thickness is 160mm after the roughing; D, finish rolling start rolling temperature are 840 ℃; It is rolling that e, finish rolling adopt 4 passages to come and go; G, finish rolling end temp are 825 ℃; Roll the back and adopt air cooling.
Gained hot-rolled steel thickness of slab 100mm, width 2600mm; The mechanical property of steel plate is: yield strength: 392MPa, and tensile strength: 525MPa, unit elongation: 26.4%, ballistic work (40 ℃): 210J, cold-bending property is qualified.
Claims (8)
1. high super-thick steel plate of intensity high and low temperature toughness, it is characterized in that, the chemical ingredients of steel is by weight percentage: C:0.10～0.20%, Si:0.15～0.40%, Mn:1.20～1.60%, S≤0.015%, P≤0.015%, Nb:0.010%～0.050%, Ni:0.25%～0.50%, Ti:0.01～0.02%, all the other are Fe and trace impurity, product thickness between 40～100mm, the hot-rolled steel sheet of wide 1500mm～4150mm.
2. the high super-thick steel plate of intensity high and low temperature toughness as claimed in claim 1, it is characterized in that, the chemical ingredients of steel is by weight percentage: C:0.12～0.16%, Si:0.30～0.35%, Mn:1.30～1.40%, S≤0.010%, P≤0.010%, Nb:0.030%～0.040%, Ni:0.30%～0.40%, Ti:0.01～0.02%, all the other are Fe and trace impurity.
3. intensity height as claimed in claim 1 or 2, the production method of the super-thick steel plate that low-temperature flexibility is high, comprise the composition design, smelt, continuous casting, heating, roughing, finish rolling, the chemical ingredients that is characterized in steel is by weight percentage: C:0.10～0.20%, Si:0.15～0.40%, Mn:1.20～1.60%, S≤0.015%, P≤0.015%, Nb:0.010%～0.050%, Ni:0.25%～0.50%, Ti:0.01～0.02%, all the other are Fe and trace impurity, product thickness between 40～100mm, the hot-rolled steel sheet of wide 1500mm～4150mm; The heating of the thick continuously cast bloom of 250～300mm is controlled between 1140 ℃～1250 ℃, heat-up time 300～500Min, tapping temperature is controlled between 1120 ℃～1220 ℃; Roughing extreme trace time temperature is between 1060～1160 ℃, and roughing adopts the 4-7 passage rolling, intermediate blank thickness 120～180mm after the roughing; The finish rolling start rolling temperature is between 780～900 ℃, and finishing temperature is in 750～870 ℃ of scopes, and finish rolling adopts 4～7 passages rolling.
4. the production method of the super-thick steel plate that intensity high and low temperature toughness as claimed in claim 3 is high, it is characterized in that, it is rolling that roughing adopts four roll reversing rollers to come and go 4～7 passages, start rolling temperature is between 1100 ℃～1210 ℃, temperature when steel is thrown in roughing is between 1060 ℃～1160 ℃, and the single pass draft of last 3 passages of roughing is not less than 15%.
5. the production method of the super-thick steel plate that intensity high and low temperature toughness as claimed in claim 3 is high is characterized in that, product thickness is between 40～60mm, and intermediate blank thickness is 110～130mm.
6. the production method of the super-thick steel plate that intensity high and low temperature toughness as claimed in claim 3 is high is characterized in that, product thickness is between 60～80mm, and intermediate blank thickness is 130～150mm.
7. the production method of the super-thick steel plate that intensity high and low temperature toughness as claimed in claim 3 is high is characterized in that, product thickness is between 80～90mm, and intermediate blank thickness is 150～170mm mm.
8. the production method of the super-thick steel plate that intensity high and low temperature toughness as claimed in claim 3 is high is characterized in that, product thickness is between 90～100mm, and intermediate blank thickness is 160～180mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102277529A (en) * | 2011-07-28 | 2011-12-14 | 莱芜钢铁集团有限公司 | High-strength high-tenacity ship plate steel and TMCP (Thermal Mechanical Control Process) production technology method thereof |
| CN109312437A (en) * | 2016-06-22 | 2019-02-05 | 杰富意钢铁株式会社 | Thick section and high strength pipeline steel tube hot rolled steel plate and thick section and high strength pipeline steel tube welded still pipe and its manufacturing method |
| CN113174536A (en) * | 2021-04-13 | 2021-07-27 | 鞍钢股份有限公司 | Economical low-temperature toughness E-grade high-strength steel plate for ship and manufacturing method thereof |
| CN114622072A (en) * | 2022-02-18 | 2022-06-14 | 唐山中厚板材有限公司 | Method for improving low-temperature toughness of large-thickness Q345E steel and Q345E steel |
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| CN101418417A (en) * | 2008-12-04 | 2009-04-29 | 南京钢铁股份有限公司 | Wide heavy standard high strength ship plate steel and technique for producing the same |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102277529A (en) * | 2011-07-28 | 2011-12-14 | 莱芜钢铁集团有限公司 | High-strength high-tenacity ship plate steel and TMCP (Thermal Mechanical Control Process) production technology method thereof |
| CN109312437A (en) * | 2016-06-22 | 2019-02-05 | 杰富意钢铁株式会社 | Thick section and high strength pipeline steel tube hot rolled steel plate and thick section and high strength pipeline steel tube welded still pipe and its manufacturing method |
| CN109312437B (en) * | 2016-06-22 | 2021-03-09 | 杰富意钢铁株式会社 | Hot-rolled steel sheet for thick-walled high-strength line pipe, welded steel pipe for thick-walled high-strength line pipe, and method for producing same |
| US11377719B2 (en) | 2016-06-22 | 2022-07-05 | Jfe Steel Corporation | Hot-rolled steel sheet for heavy-wall, high-strength line pipe, welded steel pipe for heavy-wall, high-strength line pipe, and method for producing the welded steel pipe |
| CN113174536A (en) * | 2021-04-13 | 2021-07-27 | 鞍钢股份有限公司 | Economical low-temperature toughness E-grade high-strength steel plate for ship and manufacturing method thereof |
| CN113174536B (en) * | 2021-04-13 | 2023-03-03 | 鞍钢股份有限公司 | Economical low-temperature toughness E-grade high-strength steel plate for ship and manufacturing method thereof |
| CN114622072A (en) * | 2022-02-18 | 2022-06-14 | 唐山中厚板材有限公司 | Method for improving low-temperature toughness of large-thickness Q345E steel and Q345E steel |
| CN114622072B (en) * | 2022-02-18 | 2024-01-16 | 唐山中厚板材有限公司 | Method for improving low-temperature toughness of large-thickness Q345E steel and Q345E steel |
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