Preparation method for low-density steel with strength and elongation product larger than 50 GPa.%

A low-density steel, strong plastic product technology, applied in the field of low-density steel preparation, can solve problems such as inability to meet demand, achieve high strength, good plasticity, and prevent laminar tearing.

Active Publication Date: 2018-02-09
马鞍山学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its strong plasticity is only 40GPa·%, which cannot meet the future demand of the market.

Method used

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  • Preparation method for low-density steel with strength and elongation product larger than 50 GPa.%
  • Preparation method for low-density steel with strength and elongation product larger than 50 GPa.%

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A preparation method of a low-density steel with a strength-plastic product greater than 50GPa·% in this embodiment, the chemical composition mass percentage of the low-density steel is: Mn: 19.4%, Al: 9.82%, C: 0.99%, P: 0.003 %, S: 0.003%, the rest are Fe and other unavoidable impurities, and the sum of the mass percentages of Mn and Al in the low-density steel>28%, which is 29.22% in this embodiment; and the mass percentage of Mn in the low-density steel The percentage is 19.40~20%, the ratio of Mn to Al mass is 1.8~2.0, the mass percentage of Mn of this embodiment is 19.4%, the ratio of Mn to Al mass is 1.98; In addition, it is worth noting that the low density of this method The mass ratio of Al to C in the steel is 9.5-10.5, and it is 9.9 in this embodiment. like figure 1 Shown, concrete preparation method is as follows:

[0040] Step (1) smelting: use low-carbon Mn-Fe as the matrix, add Al-Fe alloy and carbon powder, smelt through the vacuum induction melting f...

Embodiment 2

[0048] A preparation method of a low-density steel with a strength-plastic product greater than 50GPa·% in this embodiment, the chemical composition mass percentage of the low-density steel is: Mn: 19.00%, Al: 9.80%, C: 0.98%, P: 0.003 %, S: 0.003%, the rest are Fe and other unavoidable impurities, and the preparation method is basically the same as in Example 1. Then the tensile strength, elongation after fracture and strong-plastic product of the low-density steel were tested, and the test results were recorded in Table 1.

Embodiment 3

[0050] A preparation method of a low-density steel whose strength-plasticity product is greater than 50GPa·% in this embodiment, the chemical composition mass percentage of the low-density steel is: Mn: 19.8%, Al: 9.97%, C: 1%, P: 0.003 %, S: 0.003%, the rest are Fe and other unavoidable impurities, and the preparation method is basically the same as in Example 1. Then the tensile strength, elongation after fracture and strong-plastic product of the low-density steel were tested, and the test results were recorded in Table 1.

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Abstract

The invention relates to a preparation method for low-density steel with the strength and elongation product larger than 50 GPa.%, and belongs to the field of low-density steel. The preparation methodincludes the following steps of smelting, specifically, raw materials are put into a smelting furnace for smelting; casting, specifically, obtained molten steel is poured into a mold, and low-densitysteel ingots are obtained after cooling; hot rolling, specifically, the obtained low-density steel ingots are heated to 1150-1250 DEG C, heat preservation is carried out, and then at least two timesof hot rolling are carried out; solution treatment, specifically, the obtained low-density steel is subjected to heat preservation at the temperature of 1000-1100 DEG C, and quenching treatment is carried out; cold rolling, specifically, the obtained low-density steel is subjected to at least two times of cold rolling; and cooling after annealing treatment. In this way, the low-density steel is obtained. Through regulation of alloy elements and the machining process, the Fe-Mn-Al-C system low-density steel is obtained, and the morphology of the low-density steel is of a multi-phase structure including austenite, ferrite and kappa carbide, so that the low-density steel has high strength and good plasticity, and the strength and elongation product is larger than 50 GPa.%.

Description

technical field [0001] The invention belongs to the field of low-density steel, and more specifically relates to a preparation method of low-density steel whose strength-plastic product is greater than 50GPa·%. Background technique [0002] With the increasingly serious problems of resources, energy and the environment, the rise of people's awareness of environmental protection and the objective requirements of sustainable development strategies, automobile lightweight has become the future development trend. There are two main ways to achieve lightweight automobiles: one is to choose lightweight materials, such as low-density aluminum and aluminum alloys, magnesium and magnesium alloys, engineering plastics or carbon fiber composite materials, mainly aluminum alloys; It uses high-strength steel plates instead of ordinary steel plates, and reduces the thickness of steel plates to achieve light weight, mainly including martensitic steel, CP steel, TRIP steel, TWIP steel, DP s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22C33/06C22C38/04C22C38/06B22D11/111B22D11/124
CPCB22D11/111B22D11/124C21D8/0226C21D8/0236C21D8/0247C21D2211/001C21D2211/005C22C33/06C22C38/04C22C38/06
Inventor 施琦黄贞益章小峰侯清宇王萍
Owner 马鞍山学院
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