ADVANCED HIGH STRENGTH ZINC PLATED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND ELECTRICAL RESISTANCE SPOT WELDABILITY AND MANUFACTURING METHOD THEREOF

• Main Authors: LEE, Chung-Hwan, KANG, Ki-Cheol, LEE, Kang-Min, LEE, Kyoo-Young, KIM, Yong-Joo
• Format: Patent
• Language: English; French; Korean
• Published: 24.06.2021
• 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

The present invention relates to a high-strength hot-dip galvanized steel sheet with excellent surface quality and electric resistance spot weldability, and a method for manufacturing same. A galvanized steel sheet, according to one aspect of the present invention, is a galvanized steel sheet comprising a base steel sheet and a zinc-based plated layer formed on the surface of the base steel sheet, wherein the ratio (a/b) of surface hardness (a) to internal hardness (b) of the base steel sheet may be less than 0.95. La présente invention concerne une tôle d'acier à haute résistance galvanisée par immersion à chaud présentant une excellente qualité de surface et une excellente aptitude au soudage par points par résistance électrique, et son procédé de fabrication. Une tôle d'acier galvanisée, selon un aspect de la présente invention, est une tôle d'acier galvanisée comprenant une tôle d'acier de base et une couche plaquée à base de zinc formée sur la surface de la tôle d'acier de base, le rapport (a/b) d'une dureté de surface (a) à une dureté interne (b) de la tôle d'acier de base pouvant être inférieur à 0,95. 본 발명은 표면품질과 전기저항 점 용접성이 우수한 고강도 용융아연도금 강판 및 그 제조방법에 관한 것이다. 본 발명의 한가지 측면에 따른 아연도금강판은 소지강판 및 상기 소지강판의 표면에 형성된 아연계 도금층을 포함하는 아연도금강판으로서, 상기 소지강판의 표층부 경도(a)와 내부 경도(b)의 비율(a/b)이 0.95 미만일 수 있다.