Title:
METHOD FOR HOT WORKING OF Cr-CONTAINING STEEL
Document Type and Number:
WIPO Patent Application WO/2006/008804
Kind Code:
A1
Abstract:
A method for the hot working of a Cr-containing steel, which comprises holding a newly formed surface of the Cr-containing steel in a steam atmosphere, to thereby form an oxidized scale containing FeO, and then carrying out a subsequent hot working. More specifically, a method for producing a seamless steal pipe which comprises supplying a moisture to the inside of a raw hollow pipe prepared by piercing, to hold the newly formed inner surface of the raw hollow pipe in a steam atmosphere and thereby form an oxidized scale containing FeO, and then carrying out the subsequent drawing. The method allows, by the use of a simple and easy operation method and a simple device, the reduction of the surface defects being caused after a hot working, resulting in markedly prolonging the life of a tool used therein, which contributes greatly to the efficient production of a Cr-containing steel containing 5 to 18 % of Cr being in increasing demand.
More Like This:
Inventors:
Hidaka, Yasuyoshi c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Iida, Sumio c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Anraku, Toshiro c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Nakaike, Hirotsugu c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Iida, Sumio c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Anraku, Toshiro c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Nakaike, Hirotsugu c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Application Number:
PCT/JP2004/010302
Publication Date:
January 26, 2006
Filing Date:
July 20, 2004
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Hidaka, Yasuyoshi c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Iida, Sumio c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Anraku, Toshiro c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Nakaike, Hirotsugu c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Hidaka, Yasuyoshi c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Iida, Sumio c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Anraku, Toshiro c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
Nakaike, Hirotsugu c/o Sumitomo Metal Industries Ltd. (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 54100, JP)
International Classes:
B21B17/02; B21B23/00; (IPC1-7): B21B23/00; B21B17/02
Attorney, Agent or Firm:
Mori, Michio (M. MORI PATENT OFFICE, Amagasaki Building 17-23, Higashinaniwa-cho
5-chome, Amagasaki-sh, Hyogo 92, 66008, JP)
Download PDF: