Title:
MANUFACTURE OF MARTENSITIC STAINLESS STEEL TUBE EXCELLENT IN TOUGHNESS AT LOW TEMPERATURE
Document Type and Number:
Japanese Patent JP3921809
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacturing a martensitic stainless steel tube having high strength of which the yield stress exceeds 650 MPa and also having excellent toughness at a low temperature.
SOLUTION: After martensitic stainless steel which has a composition consisting of, by weight, 0.10-0.18% C, ≤0.5% Si, 0.1-1.5% Mn, ≤0.02% P, ≤0.01% S, 12-14% Cr, 1-3% Ni, ≤0.3% Al, 0.001-0.08% N and the balance Fe with inevitable impurities and further, containing, if necessary, one or ≥2 kinds among ≤0.5% Mo, ≤1.5% Cu, 0.001-0.05% Ti and 0.001-0.01% Ca, is formed into a tube by hot rolling, is if necessary, heated up to a temperature region between an Ac3 point and 950°C and successively cooled down to a room temperature at a velocity not lower than an air cooling velocity, heated up to a temperature between the Ac1 point and the Ac3 point, successively cooled down to the room temperature and then, tempering-treated at a temp. not higher than the Ac1 point.
More Like This:
| WO/1997/033707 | METHOD AND DEVICE FOR PRODUCING A HOLLOW BODY FROM SOLID ROUND STEEL |
| WO/2005/115650 | PROCESS FOR PRODUCING SEAMLESS STEEL PIPE |
Inventors:
Masaharu Oka
Shunji Sakamoto
Kazushi Maruyama
Shunji Sakamoto
Kazushi Maruyama
Application Number:
JP12065098A
Publication Date:
May 30, 2007
Filing Date:
April 30, 1998
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21B19/04; C21D9/08; C22C38/00; C22C38/40; C22C38/50; (IPC1-7): C21D9/08; B21B19/04; //C22C38/00; C22C38/40; C22C38/50
Domestic Patent References:
| JP8035009A | ||||
| JP7150251A | ||||
| JP6299301A |
Attorney, Agent or Firm:
Chihara
Terutada Hogami
Mikiji Sugioka
Terutada Hogami
Mikiji Sugioka