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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 a 1000MPa grade low manganese double-partition cold-rolled thin steel plate and a preparation method thereof. The components of cold-rolled thin steel plates are: C: 0.18~0.22%, Si: 0.30~0.50%, Mn: 2.5~3.5%, Al: 1.0~2.0%, V: 0.08~0.12%, P≤0.005% , S≤0.005%, N≤0.006%, O≤0.003%, and the rest are Fe and inevitable impurity elements. Preparation method: 1) smelting and forging; 2) solution treatment; 3) hot rolling; 4) cold rolling; 5) primary critical zone quenching: using high temperature (800~850℃) critical zone isothermal quenching; 6) secondary critical zone Zone annealing: Use lower temperature (740~780℃) annealing to make the cold-rolled thin steel plate have a yield strength of more than 750MPa, a tensile strength of more than 1000MPa, an elongation after fracture of more than 35%, and a strong plastic area of ​​more than 35GPa%. The production cost and difficulty of the preparation method of the present invention are lower than that of the existing traditional process. At the same time, it solves the technical bottleneck of poor production yield due to the strong sensitivity of temperature reversal transformation of austenite in the existing process. It has high feasibility and high safety in use.

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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