Steel for stamping formation and forming component and heat treatment method thereof

Abstract

The invention relates to steel for stamping formation. The steel is characterized by comprising the following components in percentage by weight: 0.22-0.48% of C, 5-9.5% of Mn, 0.5-3.0% of Si+Al and the balance of Fe and inevitable impurities, wherein the steel is a hot-rolled, or hot-rolled and acid-washed, or hot-rolled, acid-washed and plated steel coil or steel plate, or is a cold-rolled and annealed or cold-rolled and plated steel coil or steel plate. The invention further relates to a stamping formation process and a stamping formation component based on the steel, which are mainly applied to but not limited in a vehicle structural part. The steel coil or steel plate or the formation component is obtained by heating up to a temperature of 650-780 DEG C and keeping the temperature by 0.5-60 minutes, and contains residual austenite above 30% (calculated by volume fraction). The mechanical performances reach the following conditions: 0.5-1.2 GPa of yield strength, 1.0-1.5 GPa of tensile strength, and strength and ductility production (tensile strength multiplied by ductility) above 25 GPa%. The invention further relates to a forming component and a heat treatment method of the steel.

Description

technical field [0001] The present invention relates to a steel material for stamping, and a stamping component based on the steel and a heat treatment method. Background technique [0002] Energy saving and emission reduction has become an important indicator of automobiles, and the important means to achieve these goals is the lightweight of automobiles. Reducing vehicle weight improves fuel efficiency and reduces exhaust emissions. To reduce weight while ensuring safety, the use of high-strength steel has become an inevitable trend. At present, such as dual-phase (DP) steel, multi-phase (CP) steel, phase transformation induced plasticity (TRIP) steel, martensitic steel and other first-generation advanced high-strength steels (the strength-plastic product is tensile strength × total elongation 15~20GPa%) has been widely used in the automotive field, and has played an important role in the lightweight of automobiles. However, the formability and strength of the first gen...

AI Technical Summary

Problems solved by technology

The grain enlargement of austenite will provide more nucleation sites of stacking faults and the interaction of shear bands, but at the same time, it will cause the decrease of the elastic strain energy of the lattice cutting edge and the strain energy of shear deformation, which will cause horses. Densitic transformation

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