용융 아연 도금 강판

• Main Authors: KANETO TAIHEI, MORISHITA ATSUSHI, UCHIDA SATOSHI, NAKADA TATSUYA, YAMAGUCHI YUJI
• Format: Patent
• Language: Korean
• Published: 26.02.2020
• 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

모재 강판의 표면으로부터 1/4 두께를 중심으로 한 특정한 두께 범위에 있어서, 페라이트상이 체적분율로 0％ 이상 50％ 미만, 베이나이트 조직과 베이니틱 페라이트상과 프레시 마르텐사이트상과 템퍼링 마르텐사이트상 중 1종 이상으로 이루어지는 경질 조직의 합계가 체적분율로 50％ 이상, 잔류 오스테나이트상이 체적분율로 0％ 내지 8％, 펄라이트상과 조대 시멘타이트상의 합계가 체적분율로 0％ 내지 8％이고, 도금층과 모재 강판의 계면에, 평균 두께가 0.1㎛ 내지 2.0㎛이고, 강판 폭 방향에 있어서의 최대 두께와 최소 두께의 차가 0.5㎛ 이내인 Fe-Al 합금층을 갖고, Fe-Al 합금층에 직접 접하는 미세화층에 있어서, 강판 폭 방향에 있어서의 상기 미세화층의 최대 두께와 최소 두께의 차가 2.0㎛ 이내이다. In a specific thickness range of which center is a 1/4 thickness from the surface of a base steel sheet, a volume fraction of a ferrite phase is 0% or more and less than 50%, a volume fraction of the total of a hard structure composed of one or more of a bainite structure, a bainitic ferrite phase, a fresh martensite phase, and a tempered martensite phase is 50% or more, a volume fraction of a retained austenite phase is 0% to 8%, and a volume fraction of the total of a pearlite phase and a coarse cementite phase is 0% to 8%, at an interface between a plating layer and the base steel sheet, a Fe-Al alloy layer is provided, the Fe-Al alloy layer having an average thickness of 0.1µm to 2.0µm and a difference between a maximum thickness and a minimum thickness in the width direction of the steel sheet being within 0.5µm, and in a fine-grain layer directly in contact with the Fe-Al alloy layer, the difference between a maximum thickness and a minimum thickness of the fine-grain layer in the width direction of the steel sheet is within 2.0µm.