Mn-TRIP steel plate with product of strength and elongation of 50 GPa% for automobile and preparation method of Mn-TRIP steel plate

A technology of strong plastic products and steel plates, which is applied in the direction of improving process efficiency and can solve the problems of increasing the cost of material alloys

Active Publication Date: 2021-07-06
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of elements such as Cr, Ni, V, Nb, Ti, Cu, B, Mo, Zr, W, Co or R has greatly increased the alloy cost of the material, and its production process still uses the traditional critical process of medium manganese steel. zone annealing process

Method used

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  • Mn-TRIP steel plate with product of strength and elongation of 50 GPa% for automobile and preparation method of Mn-TRIP steel plate
  • Mn-TRIP steel plate with product of strength and elongation of 50 GPa% for automobile and preparation method of Mn-TRIP steel plate
  • Mn-TRIP steel plate with product of strength and elongation of 50 GPa% for automobile and preparation method of Mn-TRIP steel plate

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preparation example Construction

[0027] A kind of preparation method of Mn-TRIP steel plate for automobile with strong plasticity 50GPa%, specifically comprises the following steps:

[0028] 1) Smelting molten steel according to chemical composition requirements, and casting it into slabs;

[0029] 2) Homogenize the structure of the slab, heat it to 1200-1250°C, and hold it for 2-3 hours;

[0030] 3) The slab is subjected to multi-pass hot rolling deformation, the starting rolling temperature is 1150-1180°C, and the final rolling temperature is 900-950°C; the reduction rate of each pass is not less than 30%, and the cumulative reduction rate is ≥95%; after rolling Wait until the temperature reaches 680~750℃ for coiling;

[0031] 4) The hot-rolled and pickled steel plate is subjected to cryogenic rolling treatment. Specifically, the hot-rolled steel plate is soaked in liquid nitrogen for more than 30 minutes to ensure that the temperature of the steel plate is below -196°C; then the steel plate is taken out a...

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Abstract

The invention relates to a Mn-TRIP steel plate with a product of strength and elongation of 50 GPa% for an automobile and a preparation method of the Mn-TRIP steel plate. The steel plate comprises the following chemical components of, in percentage by mass, 0.18%-0.28% of C, 0.3%-1.2% of Si, 2.8%-3.8% of Mn, 0.9%-1.9% of Al, less than or equal to 0.05% of P, less than or equal to 0.05% of S, 0.10%-0.20% of V and the balance of Fe and inevitable impurities. According to the steel plate, the addition amount of alloy elements in the steel plate is greatly reduced compared with that of traditional medium manganese steel, no precious alloy elements such as Cr and Mo needs to be added, and the deep cooling rolling process and the double annealing process are combined to achieve the effect of strengthening and plastification; and the process stability is good, the structure homogenization degree is high, and the production safety is high.

Description

technical field [0001] The invention relates to the field of advanced high-strength steel manufacturing, in particular to a Mn-TRIP steel plate for automobiles with a strength-plasticity content of 50GPa% and a preparation method. Background technique [0002] With the continuous improvement of automobile lightweight requirements, more and more high-strength steels above 980MPa are used in body structures and reinforcements. At present, the mainstream product types of high-strength steel for automobiles above 980MPa mainly include dual-phase steel (DP steel), quenched and partitioned steel (QP steel), martensitic steel (MS steel), etc. However, even the most ductile QP steel has an elongation of only 20%. Low plasticity not only limits the application of high-strength steel in body structural parts, but also increases the difficulty of forming parts. [0003] With the development of medium manganese steel, the concept of strength-plastic product has been mentioned more and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/60C21D8/02C21D1/26C21D1/18
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/60C21D8/0226C21D8/0236C21D8/0247C21D8/0273C21D1/26C21D1/18C21D2211/005C21D2211/001Y02P10/20
Inventor 胡智评刘仁东林利徐鑫
Owner ANGANG STEEL CO LTD
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