METHOD FOR MANUFACTURING A STEEL PRODUCT HAVING DIFFERENT STRENGTHS THROUGH LASER QUENCHING AND QUENCHED STEEL USED FOR THE SAME

摘要

PURPOSE: A method for manufacturing a steel product having different strengths through laser quenching and quenched steel used for the same are provided to easily reinforce a portion of a material without a pre-process.;CONSTITUTION: A method for manufacturing a steel product having different strengths through laser quenching is as follows. A material, which comprises C of 0.1~0.5%, Si of 0.1~0.5%, Mn of 0.5~3.0%, P of 0.1%, S of 0.05% or less (except 0), Cr of 0.01~1.0%, Al of 0.1% or less (except 0), Ti of 0.2% or less (except 0), B of 0.0005~0.08%, and Fe and inevitable impurities of the remaining amount, is prepared. Selected one among an Al plating layer, an Al-Si plating layer, a Zn-Ni plating layer, a Zn plating layer, a Zn-Al plating layer, and a high-temperature oxidation resistant resin layer is formed on the surface of the material. The material is molded into a molded product(201) of a desired shape. The portion of the molded product, which requires high strength, is reinforced through laser quenching.;COPYRIGHT KIPO 2012