Title:
HIGH CARBON STEEL PIPE EXCELLENT IN COLD FORMABILITY AND HIGH FREQUENCY HARDENABILITY AND METHOD FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2001/096624
Kind Code:
A1
Abstract:
A high carbon steel pipe excellent in cold formability and high frequency hardenability, characterized in that it has a chemical composition, in mass %: C: 0.3 to 0.8 %, Si: 2 % or less, Mn: 3 % or less, and balance: Fe and inevitable impurities, and a structure wherein cementite has a particle diameter of 1.0 µm or less; and a method for producing the high carbon steel pipe which comprises subjecting a material steel pipe having the above composition to a heating or soaking treatment and then subjecting the treated material tube to a stretch reducing wherein a cumulative diameter reduction percentage is 30 % or more. The method can be employed for producing a high carbon electric welded steel pipe excellent in cold formability and high frequency hardenability.
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Inventors:
TOYOOKA TAKAAKI (JP)
KAWABATA YOSHIKAZU (JP)
YORIFUJI AKIRA (JP)
NISHIMORI MASANORI (JP)
ITADANI MOTOAKI (JP)
OKABE TAKATOSHI (JP)
ARATANI MASATOSHI (JP)
KOYAMA YASUE (JP)
KAWABATA YOSHIKAZU (JP)
YORIFUJI AKIRA (JP)
NISHIMORI MASANORI (JP)
ITADANI MOTOAKI (JP)
OKABE TAKATOSHI (JP)
ARATANI MASATOSHI (JP)
KOYAMA YASUE (JP)
Application Number:
PCT/JP2001/005054
Publication Date:
December 20, 2001
Filing Date:
June 14, 2001
Export Citation:
Assignee:
KAWASAKI STEEL CO (JP)
TOYOOKA TAKAAKI (JP)
KAWABATA YOSHIKAZU (JP)
YORIFUJI AKIRA (JP)
NISHIMORI MASANORI (JP)
ITADANI MOTOAKI (JP)
OKABE TAKATOSHI (JP)
ARATANI MASATOSHI (JP)
KOYAMA YASUE (JP)
TOYOOKA TAKAAKI (JP)
KAWABATA YOSHIKAZU (JP)
YORIFUJI AKIRA (JP)
NISHIMORI MASANORI (JP)
ITADANI MOTOAKI (JP)
OKABE TAKATOSHI (JP)
ARATANI MASATOSHI (JP)
KOYAMA YASUE (JP)
International Classes:
B21C37/06; B21C37/08; B21C37/16; B21C37/30; C21D8/10; C22C38/00; C22C38/02; C22C38/04; C22C38/58; B21B17/14; (IPC1-7): C22C38/00; C21D8/10; B21B17/14; B21C37/08
Foreign References:
| JPH10175027A | 1998-06-30 | |||
| JPH0641689A | 1994-02-15 | |||
| JP2000212694A | 2000-08-02 | |||
| JP2001162305A | 2001-06-19 | |||
| JP2001214218A | 2001-08-07 | |||
| JPH1058161A | 1998-03-03 | |||
| JP2000096143A | 2000-04-04 | |||
| JP2000096142A | 2000-04-04 | |||
| EP0924312A1 | 1999-06-23 |
Other References:
KAWABATA ET AL.: "Shukukei atsuen ni yoru koukan shuugou soshiki no keisei kikou", ZAIRYOU TO PROCESS, vol. 14, no. 2, 1 March 2001 (2001-03-01), pages 438, XP002945949
See also references of EP 1293580A4
See also references of EP 1293580A4
Attorney, Agent or Firm:
Ochiai, Kenichiro c/o Tokyo Head Office Kawasaki Steel Corporation Hibiya Kokusai Building 2-3 (Uchisaiwaicho 2-chome Chiyoda-ku, Tokyo, JP)
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