STEEL SHEET PLATED WITH ALUMINUM OR ALUMINUM - ZINC SUITABLE FOR HIGH-TEMPERATURE FORMING, ACQUIRING HIGH STRENGTH THEREAFTER, AND MANUFACTURING METHOD THEREFOR

• Main Authors: FUDA MASAHIRO, MAKI JUN, EGUCHI HARUHIKO, SUEHIRO MASAYOSHI, TAKADA YOSHIHISA, MIYAKOSHI TOSHIHIRO
• Format: Patent
• Language: English
• Published: 07.02.2003
• Edition: 7
• Subjects: ALLOYS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PROBLEM TO BE SOLVED: To provide an aluminum plated steel sheet or an aluminum - zinc plated steel sheet suitable for high-temperature forming, which acquires high strength after the high-temperature forming. SOLUTION: The aluminum plated steel sheet or the aluminum - zinc plated steel sheet suitable for the high-temperature forming, which acquires the high strength after the high-temperature forming, is characterized by including, by mass%, 0.15-0.55% C, <=0.5% Si, 1.5-3.0% Mn, <=0.04% S, <=0.1% P, 0.01-0.10% Al, preferably an appropriate amount of N, B and Ti, and further one or more of <=1.0% Ni, <=0.5% Cu, and <=0.2% Sn, so as to satisfy (Ni+0.5×Cu+3×Sn)>=0.012. The manufacturing method is also disclosed.