发明名称 |
PROCESS FOR PRODUCING STAINLESS-STEEL PIPE |
摘要 |
<p>A process for stainless-steel pipe production which comprises piercing and rolling a raw material stainless steel containing, by mass, Cr: 10-30%, to give a hollow shell, elongating rolling the hollow shell using a mandrel bar, together with a graphite-free lubricant, to give a finishing rolling blank pipe and heating the blank pipe in a reheating furnace and subjecting the same to finishing rolling by sizing rolling to produce a hot-finished pipe, and then subjecting this pipe as a mother pipe to cold working to produce a stainless-steel pipe. In the reheating furnace, the finishing rolling blank pipe is heated to 1000°C or more and subjected to heating in which an oxidizing gas is blown into the pipe inside, whereby a stainless-steel pipe which is inhibited from forming a carburized layer in the pipe inner surface can be produced. When the finishing rolling by sizing rolling to give a cold working mother pipe is carried out by stretch reducer rolling at 860-1050°C, an annealing heat treatment of the mother pipe for cold working can be omitted. Thus, a stainless-steel pipe having excellent surface quality can be efficiently produced.</p> |
申请公布号 |
EP2014378(B1) |
申请公布日期 |
2013.12.25 |
申请号 |
EP20070742507 |
申请日期 |
2007.04.26 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
HIDAKA, YASUYOSHI;MATSUMOTO, SATOSHI;ONO, TOSHIHIDE;NAKAIKE, KOUJI;IIDA, SUMIO;NOGAMI, HIROSHI |
分类号 |
B21B17/14;B21B23/00;B21B25/04;C21D8/10;C22C38/00;C22C38/18;C22C38/58 |
主分类号 |
B21B17/14 |
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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