Method for manufacturing steel plate component and manufacturing apparatus

Abstract

A method or the like for manufacturing a steel plate component, capable of maintaining the overall strength of the component and preventing a delayed fracture from occurring at the same time is provided. A method for manufacturing a steel plate component is characterized in that the steel plate component is locally heated by a heating electrode, the heating electrode being disposed on one side of the steel plate component, and spaced from and directly opposed to a punched part of the steel plate. The steel plate component is a high-strength steel plate having a tensile strength class of 780 MPa or higher. A heating temperature is 500 to 830° C. The steel plate component is locally heated by high-frequency induction for a short time period of 10 seconds or shorter. The heating electrode is a coil larger than the punched part and has two turns or more for the punched part.

Dependencies are inferred from the claim text.