Title:
PROCESS FOR PRODUCING STAINLESS-STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2007/126005
Kind Code:
A1
Abstract:
A process for stainless-steel pipe production which comprises piercing and rolling a stainless steel containing 10-30 mass% chromium as a raw material to obtain a raw pipe to be finish-rolled, rolling the raw pipe by drawing rolling with a mandrel using a graphite-free lubricant, subsequently heating it in a reheating furnace, finish-rolling the heated pipe by sizing rolling to produce a hot-finished pipe, and then subjecting this pipe as a raw pipe to cold working to produce a stainless-steel pipe. In the reheating furnace, the raw pipe to be finish-rolled is heated to 1,000°C or higher and subjected to a heat treatment in which an oxidizing gas is blown against the inner surface thereof, whereby a stainless-steel pipe can be produced which is inhibited from generating a carburized layer in the inner surface of the pipe. When the finish rolling by sizing rolling is conducted by stretch reducer rolling at 860-1,050°C, a softening heat treatment of the raw pipe for cold working can be omitted. Thus, a stainless-steel pipe having excellent surface quality can be produced.
Inventors:
HIDAKA, Yasuyoshi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
日高 康善 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 住友金属工業株式会社内 Osaka, 5410041, JP)
MATSUMOTO, Satoshi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
松本 聡 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 住友金属工業株式会社内 Osaka, 5410041, JP)
ONO, Toshihide (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
小野 敏秀 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 住友金属工業株式会社内 Osaka, 5410041, JP)
日高 康善 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 住友金属工業株式会社内 Osaka, 5410041, JP)
MATSUMOTO, Satoshi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
松本 聡 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 住友金属工業株式会社内 Osaka, 5410041, JP)
ONO, Toshihide (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
小野 敏秀 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 住友金属工業株式会社内 Osaka, 5410041, JP)
Application Number:
JP2007/059072
Publication Date:
November 08, 2007
Filing Date:
April 26, 2007
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 Osaka, 5410041, JP)
HIDAKA, Yasuyoshi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
日高 康善 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 住友金属工業株式会社内 Osaka, 5410041, JP)
MATSUMOTO, Satoshi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
松本 聡 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 住友金属工業株式会社内 Osaka, 5410041, JP)
ONO, Toshihide (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 Osaka, 5410041, JP)
HIDAKA, Yasuyoshi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
日高 康善 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 住友金属工業株式会社内 Osaka, 5410041, JP)
MATSUMOTO, Satoshi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
松本 聡 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 住友金属工業株式会社内 Osaka, 5410041, JP)
ONO, Toshihide (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
International Classes:
B21B17/14; B21B23/00; B21B25/04; C21D8/10; C22C38/00; C22C38/18; C22C38/58; B21B17/00; B21B23/00; B21B25/00; C21D8/10; C22C38/00; C22C38/18; C22C38/58
Attorney, Agent or Firm:
MORI, Michio (M. MORI PATENT OFFICE, Amagasaki Building 17-23,Higashinaniwa-cho 5-chome, Amagasaki-sh, Hyogo 92, 6600892, JP)
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