Low-cost lightweight 600mpa-grade automobile body steel and production method thereof

Abstract

A low-cost lightweight 600MPa-grade automobile body steel, its chemical composition and mass percentage are: C: 0.050-0.090%, Si≤0.12%, Mn: 1.00-1.30%, P≤0.016%, S≤0.005%, Als: 0.015~0.045%, Ti: 0.070~0.100%, the balance is Fe and unavoidable impurities; the preparation methods include converter, refining, continuous casting, heating, rolling, cooling, coiling, feeding Storage stacking and leveling process; continuous casting process, the steel flow from the ladle to the tundish is sealed with argon gas at the long nozzle, the process adopts a dynamic light reduction of 8mm, and the solidification end increases the reduction by 0.5mm; Gas N content ≤ 0.0055wt%. The invention has the advantages of low production cost, thin product thickness specification, uniform and stable mechanical properties, good cold bending performance and excellent plate shape quality.

Description

technical field [0001] The invention relates to a low-cost and light-weight 600MPa grade automobile body steel and a production method thereof, belonging to the technical field of hot-rolled high-strength steel production. Background technique [0002] The number of commercial vehicles in the domestic market accounts for 20% to 25% of the total number of cars, but fuel consumption accounts for 50% to 70% of the total fuel consumption of cars. Lightweight commercial vehicles are particularly urgent to reduce energy consumption and exhaust emissions. Many manufacturers have begun to prefer to use thinner, higher-strength automotive steel to achieve greater energy conservation and emission reduction on the basis of ensuring vehicle safety performance. Automobile body steel is mainly used to manufacture commercial vehicle compartments. At present, it is mainly through the Nb, V, Ti microalloying composition system, combined with the corresponding TMCP controlled rolling and cont...

AI Technical Summary

Problems solved by technology

The patent proposes that the strength level of the product is low, and the effect on the lightweight design of the car body is relatively small

[0005] In addition, in the actual production of steel strips for high-strength car bodies, there are problems such as unstable plate shape quality and large residual stress of products.

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