METHOD OF QUENCHING SHEARED PORTION, STEEL PRODUCT INCLUDING SHEARED PORTION THAT IS QUENCHED AND METHOD OF MANUFACTURING STEEL PRODUCT INCLUDING SHEARED PORTION THAT IS QUENCHED

摘要

A method of quenching a sheared portion includes a heating process heating a steel product to a temperature equal to or greater than an austenitizing temperature, a shearing process shearing the steel product which is heated in the heating process to form a sheared portion at the steel product while the steel product is maintained at the temperature equal to or greater than the austenitizing temperature, and a cooling process cooling the steel product at which the sheared portion is formed in the shearing process to a temperature equal to or smaller than a martensitic transformation start point.