Title:
PRODUCTION OF HIGH STRENGTH MARTENSITIC STAINLESS STEEL TUBE EXCELLENT IN LOW TEMPERATURE TOUGHNESS
Document Type and Number:
Japanese Patent JP3921808
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a martensitic stainless steel tube having high strength of >650 MPa yield stress and having excellent low temp. toughness.
SOLUTION: Martensitic stainless steel having a compsn. contg., by weight, 0.15 to 0.22% C, ≤0.5% Si, 0.1 to 1.5% Mn, <0.008% P, ≤0.005% S, 12 to 14% Cr, ≤0.3% Al and 0.001 to 0.08% N, furthermore contg., at need, one or ≥ two kinds among 0.05 to 0.5% Ni, 0.05 to 0.5% Mo, 0.05 to 0.5% Cu, 0.001 to 0.05% Ti and 0.001 to 0.01% Ca, and the balance Fe with inevitable impurities is made a tube by a hot rolling method, which is thereafter heated to a temp. region of the Ac3 to 950°C, is succesively cooled to a room temp. at a rate of air cooling or above and is subsequently subjected to tempering treatment at ≤Ac1 point.
Inventors:
Masaharu Oka
Shunji Sakamoto
Kazushi Maruyama
Shunji Sakamoto
Kazushi Maruyama
Application Number:
JP12064998A
Publication Date:
May 30, 2007
Filing Date:
April 30, 1998
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
B21B19/04; C22C38/00; C21D9/08; C22C38/18; C22C38/50; (IPC1-7): C21D9/08; B21B19/04; //C22C38/00; C22C38/18; C22C38/50
Domestic Patent References:
| JP3075308A | ||||
| JP8060238A | ||||
| JP4210453A |
Attorney, Agent or Firm:
Chihara
Terutada Hogami
Mikiji Sugioka
Terutada Hogami
Mikiji Sugioka