| 摘要 |
PROBLEM TO BE SOLVED: To prevent brittleness of a copper layer as brazing filler metal and a base metal due to high temperature in heating process, and improve a recycling property. SOLUTION: This steel pipe is made by plastic-deforming the hoop material composed of stainless steel sheet wherein a brazing filler metal is applied on the surface into a pipe, melting the filler metal between the walls of the multi- wound pipe, and then cooling the molten filler metal. In this case, the stainless steel sheet, wherein Ni group alloy plating of 3% base metal thickness of 1μm or more film thickness is applied on the surface is used as a hoop material.
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