B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
13/13
B23K 20/00 (2006.01) B21C 37/09 (2006.01) B23K 31/02 (2006.01) B32B 15/01 (2006.01)
Patent
CA 1079463
Title of the Invention: Overlapped Plated Steel Strip for Making Anticorrosive Double Wall Steel Pipes Abstract of the Disclosure: A double wall small diameter steel pipe so far obtained from a steel strip is made by using a steel strip copper-plated on both side surfaces or one side surface. The double wall steel pipe thus made is provided with a plating layer on each or either of the inside and outside surfaces. However, the copper-plated layer applied to obtain such double wall steel pipe is poor in the anticorrosion and is desired to be improved in the anticorrosion today. The present invention is made by providing an over- lapped plated layer having a plated layer consisting of an Ni base - Cu alloy as a lower layer and a plated layer con- sisting of copper or a Cu base - Sn alloy as an upper layer on each or one of both side surfaces of a steel strip. Ac- cording to the present invention, a double wall steel pipe having a coating higher in the anticorrosion than an Ni base - Cu alloy layer which is high in the anticorrosion but has not been so far used because its melting point is high can be obtained at or below the same temperature as in the conven- tional method. - 1 -
293314
Na
Usui Kokusai Sangyo Kabushiki Kaisha
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