TWI807791B

• Main Authors: TOBIYAMA, YOICHI, OOI, TOSHIHIKO, SHIN, OSAMU, FUJISAWA, HIDESHI, ASHIKARI, ICHIRO
• Format: Patent
• Language: Chinese
• Published: 01.07.2023
• Subjects: 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; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

Provided is a molten Al-Zn-based plated steel sheet that has excellent bending processability and non-aging property of yield elongation, and that also has good formability.　In order to achieve the above purpose, the present invention provides a molten Al-Zn-based plated steel sheet in which a plating layer has a composition containing 40 to 70 mass% of Al and 0.5 to 3.0 mass% of Si, the balance being Zn and unavoidable impurities, characterized in that: when, in a bending test in conformity with the plating adhesion test described in JIS G 3321(2019), a test piece is bent by 180° with an inner spacing nt (where t is the plate thickness of the plated steel sheet, and n is the number of the plated steel sheets) after an accelerated aging test, and the outer surface of the bent portion is observed with a 10x magnifying glass, the bending processability indicated by a minimum nt at which no cracking is recognized is less than or equal to 6t, and the yield elongation (YEL) after the accelerated aging test is less