도금 강판 및 그 제조 방법

• Main Authors: MATSUMURA KENICHIRO, GOTO YASUTO, FUTABA TAKASHI, KOBAYASHI AKINOBU
• Format: Patent
• Language: Korean
• Published: 03.11.2017
• Subjects: ALLOYS; APPARATUS THEREFOR; 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; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; FERROUS OR NON-FERROUS ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

내열성과 생산성이 우수한 도금 강판 및 그 제조 방법을 제공한다. 본 발명의 일 관점에 의하면, 강판과, 강판의 표면에 형성된 합금 도금층을 갖고, 합금 도금층은, 질량％로, Cr을 5∼91％, Fe를 0.5∼10％ 함유하고, 잔부가 Ni 및 불가피 불순물이고, 합금 도금층 중의 Ni 농도가 합금 도금층의 최표면으로부터 강판측을 향해 점감하고, 합금 도금층의 최표면으로부터 300㎚ 이상의 영역에 있어서 Ni 농도와 Cr 농도의 비가 Ni/Cr＞1이고, 합금 도금층 중의 Fe 농도가 강판측으로부터 합금 도금층의 최표면을 향해 점감하고, 합금 도금층의 최표면에 있어서의 Fe 농도가 0.5％ 이하이고, 합금 도금층 중에 형성되고, Cr 및 Fe를 포함하는 합금층의 총 두께가 500∼2000㎚로 되고, 합금 도금층의 강판에의 총 부착량이 4.5∼55.5g/㎡인 것을 특징으로 하는 도금 강판이 제공된다. [Object] To provide a plated steel sheet excellent in heat resistance and productivity and a method for producing the same. [Solution] According to an aspect of the present invention, there is provided a plated steel sheet including: a steel sheet; and an alloy plating layer formed on a surface of the steel sheet, in which the alloy plating layer consists of, in mass%, Cr: 5 to 91%, Fe: 0.5 to 10%, and the balance: Ni and unavoidable impurities, the Ni concentration in the alloy plating layer gradually decreases from an outermost surface of the alloy plating layer to a side of the steel sheet, the ratio of the Ni concentration to the Cr concentration is Ni/Cr > 1 in an area extending 300 nm or more from the outermost surface of the alloy plating layer, the Fe concentration in the alloy plating layer gradually decreases from the side of the steel sheet to the outermost surface of the alloy plating layer, the Fe concentration in the outermost surface of the alloy plating layer is 0.5% or less, the total thickness of an alloy layer formed in the alloy plating layer and containing Cr and Fe is 500 to 2000 nm, and the total amount of the alloy plating layer deposited to the steel sheet is 4.5 to 55.5 g/m 2 .