METHOD FOR PRESS WORKING, PLATED STEEL PRODUCT FOR USE THEREIN AND METHOD FOR PRODUCING THE STEEL PRODUCT

摘要

A steel product for use in hot press working which comprises a steel base product,a zinc or zinc alloy plating layer formed on the surface thereof and,formed on the Zn plating layer,a barrier layer capable of preventing the vaporization of zinc even when heated to 700 to 1000°C.The barrier layer can be formed by an upper layer plating method,a surface oxidation method,an oxidizing agent contacting method,a method of contacting a Zn ion and an oxidizing agent,an anode electrolysis method,a cathode electrolysis method or a ZnO sol application.The steel product can be subjected to hot press working without suffering oxidation of its surface,and needs no after−treatment for securing corrosion resistance.The above technique can be applied to a high tensile steel plate and a stainless steel plate.