MULTIWALL STEEL TUBE
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United States of America Patent
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Issued Date -
Dec 2, 2010
app pub date -
Nov 26, 2007
filing date -
Nov 29, 2007
priority date (Note) -
Abandoned
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Abstract
This aims to provide a multiplex-wound steel pipe which can be sufficiently supplied in its manufacturing procedure with copper needed when brazed, which has its surface freed from any re-solidification of copper, and which has a satisfactory fillet formed at its seamed portion. A steel plate includes one face having a copper-plated film thickness (t1) and the other face having a copper-plated film thickness (t2) such that the copper-plated film thickness (t1) of that one face is smaller than the copper-plated film thickness (t2) of the other face, and such that the steel plate is formed into a tubular shape having that one face positioned on the outer side face of the multiplex-wound steel pipe.
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