Invention Grant
- Patent Title: Process for producing stainless steel pipe
- Patent Title (中): 不锈钢管生产工艺
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Application No.: US12247923Application Date: 2008-10-08
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Publication No.: US08047039B2Publication Date: 2011-11-01
- Inventor: Yasuyoshi Hidaka , Satoshi Matsumoto , Toshihide Ono , Kouji Nakaike , Sumio Iida , Hiroshi Nogami
- Applicant: Yasuyoshi Hidaka , Satoshi Matsumoto , Toshihide Ono , Kouji Nakaike , Sumio Iida , Hiroshi Nogami
- Applicant Address: JP Osaka-shi
- Assignee: Sumitomo Metal Industries, Ltd.
- Current Assignee: Sumitomo Metal Industries, Ltd.
- Current Assignee Address: JP Osaka-shi
- Agency: Marshall, Gerstein & Borun LLP
- Priority: JP2006-126315 20060428
- Main IPC: B21B17/10
- IPC: B21B17/10 ; B21D37/16

Abstract:
A process for stainless-steel pipe production which comprises piercing 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.
Public/Granted literature
- US20090064749A1 PROCESS FOR PRODUCING STAINLESS STEEL PIPE Public/Granted day:2009-03-12
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