Title:
STEEL FOR HIGH STRENGTH BOLT
Document Type and Number:
Japanese Patent JP2006118003
Kind Code:
A
Abstract:
To provide a steel for a high strength bolt having excellent delayed fracture resistance and excellent cold workability.
The steel has a composition comprising, by mass, >0.20 to 0.50% C, ≤0.50% Si, <0.90% Mn, ≤0.015% P, ≤0.015% S, 0.05 to 0.50% Cu, 0.02 to 0.30% Ni, ≤0.50% Cr, 0.02 to 0.10% Ti and 0.0003 to 0.0050% B, and the balance Fe with impurities, and in which the content of Ni in the impurities is ≤0.01%.
Inventors:
HIRATA KOSHIRO
OBARA SHIGEO
KAWAZOE KENICHI
OBARA SHIGEO
KAWAZOE KENICHI
Application Number:
JP2004307330A
Publication Date:
May 11, 2006
Filing Date:
October 21, 2004
Export Citation:
Assignee:
SUMITOMO METAL IND
International Classes:
C22C38/00; C21D8/06; C22C38/54
Domestic Patent References:
| JP2004307932A | 2004-11-04 | |||
| JPH11124623A | 1999-05-11 | |||
| JPH11293401A | 1999-10-26 |
Attorney, Agent or Firm:
Shuichiro Ariyoshi