Patent ID: 7673485

Claim:
A method of forming a galvannealed steel material into a shape by first heating the galvannealed steel material and then hot pressing it, wherein the galvannealed steel material is heated to a temperature of 700 to 1000° C. in the first heating step and a temperature of 700 to 1000° C. is employed for the hot pressing step, wherein the galvannealed steel material comprises of a Fe—Zn alloy layer formed on a surface of a base steel material and an oxide layer comprised of an oxide of zinc being provided on a surface of the Fe—Zn alloy layer, the oxide layer preventing vaporization of zinc during the first heating step of the galvannealed steel material, the oxide layer having a weight of at least 10 mg/m 2 of Zn, the oxide layer being present on the surface of the Fe—Zn alloy layer prior to the first heating step.