Method for manufacturing hot-press formed steel-member, and the hot-press formed steel-member

A method for manufacturing a hot-press formed steel-member, the method comprising:

• providing a galvanized steel sheet comprising a base steel having a chemical composition comprising
• from 0.010 mass % to 0.35 mass % of C,
• from 1.0 mass % to 3.5 mass % of Mn,
• from 0.1 mass % to 2.5 mass % of Si, and
• from greater than 0 mass % to 0.5 mass % of Al,
• with the balance being iron and unavoidable impurities;
• heating the galvanized steel sheet to not lower than an Ac3 transformation-point;
• and
• executing hot-press forming at least twice after the heating,
• wherein every hot-press forming is executed so as to satisfy the following expression (1):
• R
• t
• >
• a
• ·
• (
• T
• -
• b
• )
• ,
• (
• 1
• )
• wherein
• “R” is a curvature radius (mm) of a shoulder of a tool used in the hot-press forming,
• “t” is a thickness (mm) of the galvanized steel sheet,
• “T” is a forming-start temperature (° C.) of the hot-press forming,
• “a” is a constant 0.2984, and
• “b” is a constant 590.