A kind of 1000mpa grade low manganese double partition cold-rolled thin steel plate and its preparation method

A technology for cold-rolled steel sheets and thin steel sheets, which is applied in the field of low-manganese double-partition cold-rolled steel sheets, can solve the problems of difficulty in meeting strong plastic levels, no obvious cost advantage, and low strong plastic levels, so as to improve the diffusion activation energy, Improve stability and ensure the effect of high strength and high plasticity

Active Publication Date: 2019-12-27
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Comprehensively measured, the strength and plasticity level of this steel plate is relatively low, which is difficult to meet the strength and plasticity level of the third-generation advanced high-strength steel for automobiles, and there is no obvious cost advantage in terms of the strength and plasticity product being less than 20GPa%

Method used

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  • A kind of 1000mpa grade low manganese double partition cold-rolled thin steel plate and its preparation method
  • A kind of 1000mpa grade low manganese double partition cold-rolled thin steel plate and its preparation method
  • A kind of 1000mpa grade low manganese double partition cold-rolled thin steel plate and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The 1000MPa low-Mn double-partition cold-rolled steel sheet in this embodiment has the following components by mass percentage: C: 0.18%, Si: 0.5%, Mn: 3.5%, Al: 1.5%, V: 0.10%, P: 0.004%, S: 0.003%, N: 0.004%, O: 0.002%, the balance is Fe; the thickness of the steel plate is 1.5mm.

[0038] The method for preparing the 1000MPa-level low-Mn double-partition cold-rolled thin steel sheet in the double critical region by annealing and partitioning in this embodiment includes the following steps:

[0039] 1) Melting is carried out at a temperature of 1580°C according to the composition ratio of a low-Mn double-partition cold-rolled thin steel sheet with a strength-plasticity product of 1000MPa, and then forged to obtain a steel billet with a longitudinal section size of 100mm×100mm;

[0040] 2) The slab is subjected to tissue homogenization treatment, heated to 1180°C, and isothermally held for 2 hours;

[0041] 3) The slab is subjected to multi-pass hot rolling deformatio...

Embodiment 2

[0051] The 1000MPa low-Mn double-partition cold-rolled steel sheet in this embodiment has the following components by mass percentage: C: 0.22%, Si: 0.3%, Mn: 2.5%, Al: 2.0%, V: 0.12%, P: 0.004%, S: 0.003%, N: 0.005%, O: 0.0015%, the balance is Fe; the thickness of the steel plate is 1.2mm.

[0052] The method for preparing the 1000MPa-level low-Mn double-partition cold-rolled thin steel sheet in the double critical region by annealing and partitioning in this embodiment includes the following steps:

[0053] 1) Melting is carried out at a temperature of 1580°C according to the composition ratio of a low-Mn double-partition cold-rolled thin steel sheet with a strength-plasticity product of 1000MPa, and then forged to obtain a steel billet with a longitudinal section size of 100mm×100mm;

[0054] 2) The slab is subjected to tissue homogenization treatment, heated to 1250°C, and isothermally held for 3 hours;

[0055] 3) The slab is subjected to multi-pass hot rolling deformati...

Embodiment 3

[0061] The 1000MPa low-Mn double-partition cold-rolled steel sheet in this embodiment has the following components by mass percentage: C: 0.20%, Si: 0.5%, Mn: 2.8%, Al: 1.4%, V: 0.11%, P: 0.004%, S: 0.003%, N: 0.004%, O: 0.002%, the balance is Fe; the thickness of the steel plate is 1.0 mm.

[0062] The method for preparing the 1000MPa-level low-Mn double-partition cold-rolled thin steel sheet in the double critical region by annealing and partitioning in this embodiment includes the following steps:

[0063] 1) Melting is carried out at a temperature of 1580°C according to the composition ratio of a low-Mn double-partition cold-rolled thin steel sheet with a strength-plasticity product of 1000MPa, and then forged to obtain a steel billet with a longitudinal section size of 100mm×100mm;

[0064] 2) Homogenize the structure of the slab, heat it to 1200°C, and hold it for 2.5 hours;

[0065] 3) The slab is subjected to multi-pass hot rolling deformation in a two-roll mill, the ...

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Abstract

The invention belongs to the field of metal materials, and relates to 1000-MPa low-Mn double-partitioning cold-rolled sheet steel and a preparation method thereof. The cold-rolled sheet steel comprises the following components in percentage by mass: 0.18-0.22% of C, 0.30-0.50% of Si, 2.5-3.5% of Mn, 1.0-2.0% of Al, 0.08-0.12% of V, no more than 0.005% of P, no more than 0.005% of S, no more than 0.006% of N, no more than 0.003% of O, and the balance Fe and inevitable impurities. The preparation methods comprises the following steps: (1) smelting and forging; (2) solution treatment; (3) hot rolling; (4) cold rolling; (5) primary critical-zone quenching: carrying out critical-zone isothermal quenching at the high temperature (800-850 DEG C); and (6) secondary critical-zone annealing: carrying out annealing at the relatively low temperature (740-780 DEG C), so that the yield strength, the tensile strength, the after-fracture elongation, and the strength and elongation product of the cold-rolled sheet steel can reach 750 MPa or above, 1000 MPa or above, 35% or above and 35 GPa% or above correspondingly. The production cost and difficulty of the preparation method provided by the invention are both lower than those of a conventional process; meanwhile, the technical bottleneck problem about the poor production yield caused by the high sensitivity of a reverse transformed austenite at the existing technological temperature is solved; and the feasibility and the use safety are high.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a 1000MPa-grade low-manganese double-partition cold-rolled steel sheet and a preparation method thereof. The steel type involved has a yield strength of more than 750MPa, a tensile strength of more than 1000MPa, and an elongation after fracture of more than 35%. Low-manganese double-partition cold-rolled steel sheet with strength and plasticity of more than 35GPa%. Background technique [0002] In order to cope with the huge pressure of energy conservation, emission reduction, environmental protection and safety improvement, the development of high-strength, high-toughness plasticity, light-weight and low-density automotive steel has become an urgent task for the steel and automotive industries. The research and development of Advanced high strength steel (AHSS) roughly went through three stages. The first generation mainly consisted of interstitial-free steel, high-strength low-allo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0236C21D8/0247C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 许云波胡智评邹英顾兴利彭飞
Owner NORTHEASTERN UNIV LIAONING
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