| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a hot stamping method which enables the formation of a steel component having a region with selective strength characteristics.SOLUTION: The method comprises the steps of: setting a specific region to a steel sheet so that the specific region in a steel component has a desired microstructure different than a microstructure in remaining regions of the component; setting a corresponding specific region to a die; heating the steel sheet to 850°C or more; stamping the steel sheet heated by the die, thereby forming the steel component; cooling the specific region so that the specific region in the steel component has the desired microstructure different than the microstructure in remaining regions of the component, and contacting the die to the entire surface of the steel component. The steel sheet is coated with an AlSi coating agent. In the step of heating the steel sheet, a part of AlSi coating agent is diffused to the steel sheet, and a layer structure with three phases of Al/Si/Fe is formed on the surface of the steel sheet.</p> |
