A kind of high-strength toughness and high-strength plasticity automobile steel and its preparation method

Abstract

The invention relates to a high-strength toughness and high-strength plasticity automobile steel and a preparation method thereof, which belong to the technical field of manufacturing high-toughness, high-strength and high-strength plasticity automobile steel. Chemical composition of steel: C: 0.15‑0.60wt%, Si: 0‑2.0wt%, Ni: 0‑2.0wt%; Mn: 3.0‑6.0wt% and Al: 2.0‑6.0%, the rest is Fe and not Avoid impurity elements. On this basis, one or more of the following microalloying elements can be added, Nb: 0‑0.10wt%; V: 0‑0.10wt%; Ti: 0‑0.10wt% and Mo: 0‑0.10wt%, Cu : 0-0.50wt%, B: 0.0005-0.005wt%. The advantage is that through the alloying of C, Mn and Al, rolling and annealing in the dual-phase region, a multi-phase, multi-layer, and metastable microstructure is formed, and the V-type impact toughness at -40°C is not less than 120J , the strength-plastic product is not less than 50GPa%, and the cost is far lower than the traditional high-manganese steel and the comprehensive mechanical properties are much higher than the low-cost and high-performance of the medium-manganese steel. It can be used in the field of automobile body-in-white and transmission parts manufacturing in the form of rods or plates.

Description

technical field [0001] The invention belongs to the technical field of manufacturing high-toughness, high-strength, plastic-deposited automotive steel, and in particular provides a high-strength, high-strength, high-strength, plastic-deposited automotive steel and a preparation method thereof, namely: a multi-phase, multi-layered and metastable microstructure regulation and control Low-cost, high-strength, toughness and high-strength plasticity automotive steel and its preparation method. [0002] technical background [0003] In response to the requirements of light weight and high collision safety of automobiles, the steel for automobile body-in-white and steel for transmission parts is developing towards higher strength. Countries at home and abroad have carried out a large number of high-strength steel instead of low-strength steel steel development and high-strength steel forming technology research, forming Q&P high-strength plastic automotive steel with quenching and p...

AI Technical Summary

Problems solved by technology

For example, cracks and edge cracks occur in the stamping process of the third-generation automobile steel, which reduces the yield of auto parts and the collision safety during use.

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