Super-high-strength medium-Mn automobile steel plate with excellent plasticity and preparing method thereof

An automobile steel plate and ultra-high strength technology, which is applied in the field of ultra-high strength medium manganese automobile steel plate and its preparation, and can solve problems such as hindering the lightweight of automobiles.

Active Publication Date: 2016-11-16
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen from the above that although the medium manganese TRIP steel can obtain good plasticity through the composition of no more than 9% Mn content, and the strong plastic product reaches more th

Method used

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  • Super-high-strength medium-Mn automobile steel plate with excellent plasticity and preparing method thereof
  • Super-high-strength medium-Mn automobile steel plate with excellent plasticity and preparing method thereof
  • Super-high-strength medium-Mn automobile steel plate with excellent plasticity and preparing method thereof

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Embodiment

[0026] The technical solutions of the present invention will be further described below with regard to the embodiments.

[0027] Table 1 Chemical Composition of Invention Steel

[0028] Element

C％

Mn%

Al％

P％

S％

V％

Nb%

A

0.47

9.97

1.85

<0.005

<0.005

0.7

-

B

0.38

11.69

3.14

<0.005

<0.005

0.72

0.1

C

0.30

8.96

2.5

<0.005

<0.005

0.3

-

D

0.35

8.21

2.56

<0.005

<0.005

0.31

0.03

[0029] 1. Smelting and casting: the embodiment adopts the chemical composition percentage shown in Table 1 to weigh the raw materials, and after being smelted and poured into an ingot by an induction furnace, it is hot forged into a slab with a thickness of 50 mm;

[0030] 2 Rough rolling: the hot-forged slab is solidified at 1150°C for 2.5 hours, the starting rolling temperature is 1000°C, 4-7 passes are completed, the final rolling temperature is 800°C (4mm thick),...

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Abstract

The invention provides a super-high-strength medium-Mn automobile steel plate with excellent plasticity and a preparing method thereof and belongs to the technical field of production of third-generation steel plate rolls for automobiles. The super-high-strength medium-Mn automobile steel plate comprises the following chemical components in a percent: 0.3-0.5wt% of C, 8-12wt% of Mn, 1.8-3.5wt% of Al, 0.25-0.7wt% of V, smaller than or equal to 0.008wt% of P, smaller than or equal to 0.08wt% of S and the balance of Fe and unavoidable impurities. Through reasonable chemical components and technical design, a comprehensive application strengthened by various mechanisms, such as precipitation strengthening, deformation induced phase change strengthening and twinning strengthening, is realized, thereby obtaining super-high strength. Through hot rolling, acid pickling, warm rolling and cover annealing technologies, the steel plate with more than 1500MPa tensile strength and 20-40GPa.% static toughness can be obtained; and otherwise, the cold-rolled steel plate with more than 1200MPa tensile strength and 35-65GPa.% static toughness can be obtained through hot rolling, hot rolling annealing, acid pickling, cold rolling and continuous annealing technologies.

Description

technical field [0001] The invention belongs to the production technical field of the third-generation high-strength steel sheet coil for automobiles, and in particular provides an ultra-high-strength medium-manganese automobile steel sheet with excellent plasticity and a preparation method. It is a new steel grade developed based on a variety of strengthening mechanisms and the design concept of combining composition and structure control. It focuses on obtaining ultra-fine grains and submicron precipitates through different rolling process control and composition design, and adopts suitable The critical zone annealing treatment obtains ferrite and austenite and other multiphase structures, and the preparation process of a new type of ultra-high-strength automotive steel plate with excellent plasticity is obtained by means of precipitation strengthening, deformation-induced phase transformation strengthening and twinning strengthening. Background technique [0002] With the...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/04C22C38/06C22C38/12
CPCC21D8/0226C21D8/0231C21D8/0236C21D8/0247C22C38/04C22C38/06C22C38/12
Inventor 罗海文董瀚
Owner CENT IRON & STEEL RES INST
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