Steel material for thermal punching formation, thermal punching formation process and thermal punching formation component

Abstract

The invention provides a steel material for thermal punching formation, a thermal punching formation process and a thermal punching formation component. The steel material contains the following components in percentage by weight: 0.2%-0.4% of C, 0-0.8% of Si, 0-1.0% of Al, 0-0.005% of B, 0.5%-3.0% of Mn, 0-1% of Mo, 0-2% of Cr, 0-5% of Ni, 0-0.4% of V, 0-0.2% of Nb, Ti less than or equal to 0.01%and the balance of following unavoidable impurity elements such as P, S and N during smelting, wherein when B is less than or equal to 0.0005%, a formula 29*Mo+16*Mn+14*Cr+5.3*Ni is more than or equal to 30%; and when B is more than 0.0005% and less than or equal to 0.005%, the steel material contains 0.4%-1.0% of Al.

Description

technical field [0001] The invention relates to a steel material for hot stamping forming, a hot stamping forming process and a hot stamping forming component. Background technique [0002] Lightweight is an important way to achieve energy saving and emission reduction in the automotive industry. Every 10% reduction in the mass of the car body can reduce fuel consumption by 5-10%. Steel materials generally account for more than 60% of automobile body materials. The use of advanced high-strength steel can reduce the thickness of parts, reduce the use of materials, and reduce the weight of the car body while ensuring the safety of the car. However, as the strength of steel materials increases at room temperature, the formability decreases, and room temperature forming of high-strength steels faces problems such as springback and abrasive wear. Therefore, cold stamping at room temperature can generally only be used for steel materials with a strength below 1000 MPa. . [0003...

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Problems solved by technology

[0011] However, Patent Document 2 needs to cool the steel to M s and M f Among them, according to the steel composition of Patent Document 2, the temperature is higher than room temperature, and it is difficult to accurately control the temperature when the steel plate is hot-stamped and cooled in the grinding tool, and it needs to be heated immediately to the bainite transformation temperature range. Industrial hot stamping process equipment is difficult to realize

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