용융 도금 강판, 및 그 제조 방법

• Main Authors: NAKAGAWA YUSAKU, KANETO TAIHEI, AMANO YOKO, MORISHITA ATSUSHI, OOHASHI TOORU
• Format: Patent
• Language: Korean
• Published: 15.11.2022
• Subjects: ALLOYS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS; 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; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

본 발명의 일 양태에 관한 용융 도금 강판은, 모재 강판과, 용융 도금층을 구비하고, 상기 용융 도금층의 화학 성분은, Al: 4.0 내지 22질량％, Mg: 1 내지 10질량％, 및 Si: 0.0001 내지 2질량％를 함유하고, 잔부가 Zn 및 불순물로 이루어지고, 상기 용융 도금층의 부착량은, 양면의 합계로 40 내지 600g/㎡이며, 수직 단면 10mm 길이 시야에 있어서 측정되는, 상기 모재 강판과 상기 용융 도금층의 계면에 존재하는 계면 Mg2Si상의 계면 접촉 길이의 합계가, 상기 시야의 20％ 이하이고, 모재 강판과 용융 도금층의 계면에 존재하는, 원 상당 직경 30㎛ 이상의 계면 Mg2Si상의, 평면으로 보아 측정되는 개수 밀도가 10개/㎟ 이하이다. According to one embodiment, the hot-dip coated steel sheet comprises a parent material steel sheet and a hot-dip coating layer, the chemical composition of the hot-dip coating layer containing 4.0-22 mass% Al, 1-10 mass% Mg, and 0.0001-2 mass% Si, the remainder being Zn and impurities, the total amount of hot-dip coating layer deposited on both sides being 40-600 g/m2, the total interfacial contact length of interfacial Mg2Si phases that are present at the interface between the parent material steel sheet and the hot-dip coating layer as measured in a 10-mm field of view of a vertical cross-section being no more than 20% of the field of view, and, as measured in plan view, the number density of interfacial Mg2Si phases that are present at the interface between the parent material steel sheet and the hot-dip coating layer and have a circle equivalent diameter of at least 30 μm being no more than 10/mm2.