Lightweight high-strength dual-phase steel formula and galvanizing production process thereof

Abstract

The invention discloses a lightweight high-strength dual-phase steel formula and a galvanizing production process thereof, and belongs to the field of steel production and processing. Lightweight high-strength dual-phase steel is prepared from the compositions in percentage by mass: 0.103% of carbon, 0.44% of silicon, 1.8% of manganese, 0.011% of phosphorus, 0.003% of sulfur, 0.34% of chromium, 0.028% of niobium, and the balance of scrap steel; high temperature heating, rapid cooling, and low alloying temperature are adopted in the galvanizing production process, the produced dual-phase steelhas excellent properties such as large tensile strength, large elongation, and lightweight; the galvanizing production process is optimized by adjusting the proportion of elements in the dual-phase steel so that the produced steel can meet the requirements of the automobile industry for stiffness and crash performance, safety performance of an automobile is greatly improved, the manufacturing requirements of modern automobiles for lightweight and low energy consumption are met, and the application range is very wide.

Description

technical field [0001] The invention belongs to the field of steel production and processing, in particular to a lightweight high-strength dual-phase steel. Background technique [0002] Dual-phase steel (dual-phase, DP steel for short), also known as multi-phase steel. A steel composed of a two-phase structure of martensite, austenite or bainite and a ferrite matrix. Generally, the steel composed of ferrite and austenite phase structure is called duplex stainless steel, and the steel composed of ferrite and martensite phase structure is called duplex steel. Dual-phase steel is obtained by low-carbon steel or low-alloy high-strength steel after critical zone heat treatment or controlled rolling. The yield strength σs of a typical dual-phase steel is 310MPa, and the tensile strength σb is 655MPa. Duplex steel is used to manufacture complex components of cold stamping and deep drawing, and can also be used as pipeline steel, chain, cold drawn steel wire, prestressed steel b...

AI Technical Summary

Problems solved by technology

[0005] Under the current production process, no high-strength galvanized alloyed automobile sheet with a tensile strength of 780MPa has been produced, and the 780MPa-grade galvanized dual-phase steel that meets the performance requirements can be used for structural parts and reinforcements of automobiles, etc. Manufacture to meet the requirements of automobile lightweight trend, therefore, there is an urgent need for a lightweight high-strength dual-phase steel formulation and its galvanized production process to solve the above problems

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