Steel plate for hot stamping, hot stamping process and hot-stamped member

Abstract

The invention relates to a steel plate for hot stamping, a hot stamping process and a hot-stamped member. The steel plate for hot stamping is characterized by comprising, by weight, 0.18 to 0.42% of C, 4 to 8.5% of Mn and 0.8 to 3.0% of Si and Al, with the balance being Fe and avoidable impurities, wherein the alloy component of the steel plate satisfy the condition that the actual measured value of martensite phase transformation beginning temperature is no more than 280 DEG C. A manufacturing method for the hot-stamped member comprises the following steps: heating a material to 700 to 850 DEG C and carrying out stamping; then carrying out cooling in a die or air cooling or cooling in other manners to 150 to 260 DEG C below the martensite phase transformation beginning temperature; and heating the stamped member to 160 to 450 DEG C, maintaining the temperature for 1 to 100,000 s, carrying out tempering heat treatment and cooling the stamped member to room temperature. The hot-stamped member prepared in the invention has yield strength of no less than 1200 MPa, tensile strength of no less than 1600 MPa and total elongation percentage of no less than 10%.

Description

technical field [0001] The present invention relates to a new steel plate for hot stamping forming, a hot stamping forming process, and an ultra-high-strength and toughness formed member made therefrom, and more specifically, to a new steel plate for hot stamping forming. The forming process produces high-strength and high-toughness components, which are used for safety structural parts and reinforcement components for automobiles, and other high-strength and tough components for automobiles. Background technique [0002] Energy saving, safety, and environmental protection are the themes of automobile development in the world today, and automobile lightweight plays an important role in resource conservation, environmental protection, and promotion of automobile safety. In order to ensure safety while reducing weight, the use of high-strength steel has become an inevitable trend. However, the increase in the strength of steel materials usually leads to a decrease in formabil...

AI Technical Summary

Problems solved by technology

In this method, the component must be cooled to a specific temperature of 150-280°C and then raised to 150-450°C for heat preservation, which makes it difficult to control the temperature accuracy and uniformity of the component, or requires a complex production process to control it. Quenching temperature is not conducive to the actual production of hot stamping forming components

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