Title:
METHOD OF PRODUCING HIGH TENSILE STRENGTH STEEL TUBE HAVING EXCELLENT WELDABILITY AND C-DIRECTION TOUGHNESS
Document Type and Number:
Japanese Patent JP3797172
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a high tensile strength steel sheet which has satisfactory toughness, has excellent strength and toughness, in particular, toughness in a direction orthogonal to a rolling direction, and has a satisfactory balance in the characteristics and cost effectiveness.
SOLUTION: The high tensile strength steel sheet for welding has a composition containing, by mass, 0.02 to 0.10% C, 0.05 to 0.65% Si, 0.40 to 2.00% Mn, ≤0.003% S, 0.50 to 2.00% Cu, and ≤0.005% Si, and, the pole density of each direction in a reversed pole figure to the direction of the normal of the sheet face is ≤3.2. In the method of producing the high tensile strength steel sheet for welding, a steel slab of a rolling stock is subjected to rolling in a width direction at ≤1,250°C so as to control the draft in the process of the rolling to ≥30%, and is hot-rolled at a finishing temperature of an Ar3 point-30°C or higher, so that the pole density of each direction in a reversed pole figure to the direction of the normal of the sheet face is controlled to ≤3.2.
Inventors:
Tomoya Kawabata
Akihiko Nagayoshi
Atsushi Furukawa
Hiroshi Nakamura
Ichiro Seta
Akihiko Nagayoshi
Atsushi Furukawa
Hiroshi Nakamura
Ichiro Seta
Application Number:
JP2001292312A
Publication Date:
July 12, 2006
Filing Date:
September 25, 2001
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
C21D8/02; C22C38/00; C22C38/60; (IPC1-7): C22C38/00; C21D8/02; C22C38/60
Domestic Patent References:
| JP1230713A |
Attorney, Agent or Firm:
Terutada Hogami
Mikiji Sugioka
Mikiji Sugioka