Environment-friendly steel for ultrahigh strength automotive structural part and production method of environment-friendly steel

Abstract

The invention discloses an environment-friendly steel for an ultrahigh strength automotive structural part and a production method of the environment-friendly steel. The environment-friendly steel isprepared from the following chemical components in percentage by weight: 0.11-0.50 percent of C, 0.15-0.65 percent of Si, 0.60-2.50 percent of Mn, smaller than or equal to 0.020 percent of P, smallerthan or equal to 0.010 percent of S, 0.015-0.080 percent of Als, 0.15-0.80 percent of Cr, 0-0.80 percent of Mo, 0-0.80 percent of Ni, 0-0.10 percent of Ti, 0-0.10 percent of Nb, 0-0.10 percent of V, 0.001-0.005 percent of B, smaller than or equal to 0.008 percent of N and the balance of Fe and inevitable impurities. The method comprises the following steps of performing molten iron desulphurization, conventional electric furnace or converter smelting, continuous casting, descaling treatment, casting billet soaking, rolling, cooling treatment, coiling, steel coil uncoiling treatment, blanking treatment, austenization, die stamping forming and quenching to obtain the steel for the ultrahigh strength automotive structural part. For the environment-friendly steel for the ultrahigh strength automotive structural part and the production method of the environment-friendly steel, the comprehensive energy consumption of ton steel is lowered by 71.5 percent, the environmental impact index is lowered by 55.2 percent, the demand on the steel for the ultrahigh strength automotive structural part for automotive body lightweight design is met, and the steel can be expandedly applied to other ultrahigh strength steel fields at the same time.

Description

technical field [0001] The invention relates to ultra-high-strength steel for automobiles, in particular to an environment-friendly ultra-high-strength automobile structural steel and a production method thereof. Background technique [0002] With the development of the automobile industry and the country's stringent requirements for energy consumption, emissions and the life cycle assessment of automobile manufacturing. For example, the development goals of the automobile industry plan clearly stated that by 2020, the overall fuel consumption level of new passenger cars in my country will reach 5.0 liters per 100 kilometers, and the fuel consumption of energy-saving passenger cars will fall below 4.5 liters per 100 kilometers. To reach about 400 kilometers, an important way to meet the above requirements is to reduce the weight of the body. Therefore, under the premise of ensuring the safety of the body, the materials for the body will definitely develop in the direction of ...

AI Technical Summary

Problems solved by technology

[0007] To sum up: many ultra-high-strength steels for automobiles have been developed in the existing technology, but the alloy costs are high, the manufacturing process is long, the energy consumption and emissions in the manufacturing process are high, and the impact on the environment is great

In addition, the existing cold-formed ultra-high-strength steel has poor formability. For complex parts, there are often problems such as springback, stamping cracks, and dimensional accuracy of parts that cannot meet the requirements; for hot-formed ultra-high-strength steel, its bending properties, Poor resistance to hydrogen-induced delayed cracking and corrosion resistance

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