Method for manufacturing hot press molded product and hot press molded product

• Main Authors: MORINO MASAKI, NAKAGAITO TATSUYA, TAMAI YOSHIKIYO, MINOTE TORU, KOBIKI HIDEAKI, TOKITA YUICHI
• Format: Patent
• Language: Chinese; English
• Published: 01.08.2017
• Subjects: APPARATUS THEREFOR; CHEMISTRY; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; PERFORMING OPERATIONS; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; PUNCHING METAL; TRANSPORTING; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

A method for manufacturing a hot press molded product comprises a step for preparing a member for hot pressing with a one sheet part and a two sheet layered part wherein a second surface treated steel sheet on the surface of which is formed a Zn-Ni plating layer is welded to a first surface treated steel sheet on the surface of which is formed a Zn-Ni plating layer, a step for heating the member for hot pressing to a temperature range from the Ac3 transformation point for the base steel sheet for the first surface treated steel sheet to 1000 DEG C, a step for obtaining a molded body by setting the temperature of both the one sheet part and the two sheet layered part of the member for hot pressing to less than or equal to the solidification point of the Zn-Ni plating layer of the first and second surface treated steel sheets and greater than or equal to the Ar3 transformation point for the base steel sheet for the first surface treated steel sheet and initiating press molding of the member for hot pressing, an