Zn-coated stainless steel welded pipe

Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...

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138143, 138146, 138171, 428659, F16L 902

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active

048852155

ABSTRACT:
An exterior stainless steel sheet is provided comprising a stainless steel substrate and a coating layer formed on one surface of the steel substrate from Al, Al alloy, Zn or Zn alloy to a thickness of 0.1 to 70 .mu.m, preferably 1 to 70 .mu.m. A Zn or Zn-Ni alloy plated stainless steel strip is prepared by degreasing a stainless steel strip, substantially activating the surface of the strip, and electroplating the strip in a zinc or zinc-nickel alloy plating bath at pH 3.5 or lower. During electroplating of one side, the other side of the strip not to be plated is covered with a protective film. A stainless steel sheet comprising a stainless steel substrate and a coating layer formed on one surface of the steel substrate from Zn or Zn alloy to a thickness of 0.1 to 50 .mu.m, preferably 1 to 50 .mu.m is useful in preparing welded pipes.

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patent: 3536459 (1970-10-01), Bates
patent: 3556745 (1971-01-01), Zaremski
patent: 3637354 (1972-01-01), Zaremski
patent: 3830634 (1974-08-01), Zaremski et al.
patent: 4079157 (1978-03-01), Yagi et al.
patent: 4672007 (1987-06-01), Teng et al.

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