A kind of low-density, high-strength and toughness automobile steel plate and its preparation process

Abstract

The invention belongs to the field of metal materials, and relates to a novel high strength steel board low in density, high in strength and good in anti-corrosion performance, in particular to component design and a preparation method of the novel automobile-used steel. The automobile-used steel board is characterized by comprising the following specific chemical compositions by mass percentage: 0.60-0.70 percent of C, 0.30-0.40 percent of Si, 10.0-15.0 percent of Mn, 5.0-10.0 percent of Al, less than 0.005 percent of P, less than 0.003 percent of S and Fe and unavoidable impurities in balancing amount. The preparation process comprises the following steps: performing smelting according to the chemical compositions, and forging casting blank material into a steel blank; heating the steel blank to 1,130-1,170 DEG C, keeping the temperature for 2 hours, and performing multi-pass hot-rolling deformation, wherein the rolling starting temperature ranges from 1,030-1,070 DEG C, the rolling stopping temperature ranges from 850-900 DEG C, the accumulated deformation amount ranges from 80 percent to 85 percent, and the rolling temperature is from 200 DEG C to 250 DEG C; after hot rolling, further performing solution treatment of the steel board, keeping the temperature at 1,000-1,050 DEG C for 0.5-1 hour, and performing water quenching treatment; taking a dual-phase organization combining austenite and ferrite, and obtaining the lower density and high toughness automobile-used steel board.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to the composition design and preparation process of hot-rolled low-density steel, which is used for preparing low-density, high-strength and toughness steel plates for automobiles. Background technique [0002] Reducing energy consumption, reducing environmental pollution and saving limited resources is a very important and urgent problem that people are facing today. Reducing the weight of automobiles is one of the important measures to improve the fuel economy and save energy consumption of automobiles. At present, the development and research of automobile lightweight projects at home and abroad, and the development of high-strength or ultra-high-strength steel plates, reduce the weight of cars by reducing the thickness of the steel plates used. [0003] Low-density, high-strength and tough steel is designed with reasonable composition. This steel has a certain content of Mn, Al, ...

AI Technical Summary

Problems solved by technology

[0004] Currently developed advanced steel materials for automobiles include TRIP and TWIP steels, as well as developed high-manganese and high-aluminum steels, all of which ensure the strength, toughness and impact resistance of steel plates. Improve the welding performance of steel, gradually develop medium-manganese high-strength steel, and add certain light elements at the same time to effectively reduce the density of the steel plate

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