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 (JP)
YAMAKAWA TOMIO (JP)
SEMBA HIROYUKI (JP)
HORI HIROFUMI (JP)
KONDO TSUNEO (JP)
YAMAKAWA TOMIO (JP)
SEMBA HIROYUKI (JP)
HORI HIROFUMI (JP)
KONDO TSUNEO (JP)
Application Number:
PCT/JP2004/009078
Publication Date:
December 29, 2004
Filing Date:
June 22, 2004
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
SHIMODA KAZUHIRO (JP)
YAMAKAWA TOMIO (JP)
SEMBA HIROYUKI (JP)
HORI HIROFUMI (JP)
KONDO TSUNEO (JP)
SHIMODA KAZUHIRO (JP)
YAMAKAWA TOMIO (JP)
SEMBA HIROYUKI (JP)
HORI HIROFUMI (JP)
KONDO TSUNEO (JP)
International Classes:
B21B19/04; B21B3/02; (IPC1-7): B21B19/04; C22C38/00
Foreign References:
JPS60114554A | 1985-06-21 | |||
JP2001049400A | 2001-02-20 | |||
JPH084811B2 | 1996-01-24 | |||
JP2000301212A | 2000-10-31 | |||
JP2001162306A | 2001-06-19 | |||
JPH01228603A | 1989-09-12 |
Other References:
See also references of EP 1676652A4
Attorney, Agent or Firm:
Hirose, Shoichi (4-2 Nihonbashi Honcho 4-chom, Chuo-ku Tokyo 23, JP)
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