Title:
TUBE STOCK FOR MANUFACTURING SEAMLESS STEEL TUBE AND METHOD OF MANUFACTURING THE SAME
Document Type and Number:
WIPO Patent Application WO/2004/112977
Kind Code:
A1
Abstract:
A austenitic stainless steel bored tube stock having excellent inner surface properties and a method capable of mass-producing sound stainless seamless steel tube on an industrial scale. Austenitic stainless steel billets with P of 0.040% or less and S of 0.020% or less are drilled and rolled so that the extending ratio H thereof (outer diameter of tube stock/diameter of raw material billets) can meet the requirement of the following equation. &lcub P(%)/(0.025 × H -0.01)&rcub 2 + &lcub S(%)/(0.015 × H - 0.01)&rcub 2 ≤ 1 Also, when the austenitic stainless steel seamless tube is manufactured, the tube stock is rolled.
Inventors:
Shimoda, Kazuhiro c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Yamakawa, Tomio c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Semba, Hiroyuki c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Hori, Hirofumi c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Kondo, Tsuneo c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Yamakawa, Tomio c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Semba, Hiroyuki c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Hori, Hirofumi c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Kondo, Tsuneo c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Application Number:
PCT/JP2004/009078
Publication Date:
December 29, 2004
Filing Date:
June 22, 2004
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Shimoda, Kazuhiro c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Yamakawa, Tomio c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Semba, Hiroyuki c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Hori, Hirofumi c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Kondo, Tsuneo c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Shimoda, Kazuhiro c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Yamakawa, Tomio c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Semba, Hiroyuki c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Hori, Hirofumi c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
Kondo, Tsuneo c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-k, Osaka-shi Osaka 41, 54100, JP)
International Classes:
B21B19/04; B21B3/02; B21B19/00; B21B3/02; (IPC1-7): B21B19/04; C22C38/00
Attorney, Agent or Firm:
Hirose, Shoichi (Tozan Building, 4-2 Nihonbashi Honcho 4-chom, Chuo-ku Tokyo 23, 10300, JP)
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