| 摘要 |
PROBLEM TO BE SOLVED: To improve the corrosion resistance, brazing property and resistance wealability by forming alloy composed of one or more kinds of metallic elements such as Zn or Zn and Ni, etc., on both surfaces of a steel sheet, and a chromate film layer on the using surface at the inner surface side of a vessel and further, and organic resin film containing metallic powder on this upper layer by specific quantity to each layer. SOLUTION: Firstly, the alloy composed of one or more kinds of Zn or Zn and Ni, Sn, Al, Fe, Co, Mg, Mn is formed so that the coating quantity becomes 20-60 g/m<2> . On this surface, the chromate film layer is formed so as to become 10-100 mg/m<2> expressed in terms of Cr. Further, on the upper layer, the organic resin film composed of 20-70 wt.% one or more kinds of powder of Zn, Al, Ni, Mg, Sn, stainless steel or these alloys and the balance one or more kinds of epoxy base, phenol base, polyester base, polyurethane base, polyethylene base, phthalic acid base, fluorine base and silicone base is coated in 2-20μm thickness.
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