发明名称 |
Process for manufacturing clad pipe |
摘要 |
Clad pipe having an inner pipe and an outer pipe metallurgically bonded to each other is manufactured by a process comprising the steps of: (a) preparing an inner pipe and an outer pipe made of different metallic materials, the outer pipe having an inner diameter larger than the outer diameter of the inner pipe; (b) forming an Ni-B layer by electroplating or electroless plating on the surface of one of the pipes facing the other pipe when the two pipes are assembled, the Ni-B layer having a thickness of 2-100 mu m and consisting essentially, on a weight basis, of B: 0.5%-7%, Fe: 0%-30%, P: 0%-7%, and a balance of Ni and inevitable impurities; (c) assembling the two pipes by inserting the inner pipe into the outer pipe; (d) subjecting the assembled pipes to cold working for reduction in diameter to such a degree that the outer diameter of the inner pipe is reduced by from 0.5% to 10% to form raw clad pipe in which the inner and outer pipes are in contact; and (e) subjecting the raw clad pipe to heat treatment in the temperature range of 1050 DEG -1250 DEG C. for a time sufficient to metallurgically bond the inner and outer pipes by diffusion bonding.
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申请公布号 |
US5584428(A) |
申请公布日期 |
1996.12.17 |
申请号 |
US19950385543 |
申请日期 |
1995.02.08 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD. |
发明人 |
SATOH, ATSUSHI;OKAMOTO, HIROSHI;FUKUI, KUNIHIRO;UCHIDA, JUN-ICHI;OGAWA, KAZUHIRO;TAKA, TAKAO;FURUGEN, MUNEKATSU;KIMOTO, MASANARI |
分类号 |
B21C37/06;B21C37/15;B23K13/02;C23C26/00;(IPC1-7):B23K20/00 |
主分类号 |
B21C37/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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