Title:
STEEL FOR SPRING HAVING EXCELLENT PERMANENT SET RESISTANCE, STEEL WIRE FOR SPRING AND SPRING
Document Type and Number:
Japanese Patent JP3940263
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide steel for a spring which enables the production of a spring exhibiting permanent set resistance in fatigue capable of sufficiently corresponding to required characteristics in recent years even when used in a high stress load condition as wire-drawn, a steel wire rod for a spring to be made into the stock for a spring, a spring which exhibits the above characteristics or the like.
SOLUTION: The steel has a composition containing 0.5 to <0.8% C, 1.2 to 2.5% Si, 0.5 to 1.5% Mn, 0.05 to 1.5% Cr and 0.05 to 0.25% V. In ferrite in the pearlitic structure, the carbides and carbonitrides of V and Cr and the multiple carbides and multiple carbonitrides of V and Cr of ≤50 nm are present by ≥10 pieces/μm2 in total.
Inventors:
Nobuhiko Ibaraki
Jun Inada
Sumie Suda
Takamura Norito
Tendou Satoru
Fujiwara Tadayoshi
Jimbo Tetsuo
Jun Inada
Sumie Suda
Takamura Norito
Tendou Satoru
Fujiwara Tadayoshi
Jimbo Tetsuo
Application Number:
JP2000387639A
Publication Date:
July 04, 2007
Filing Date:
December 20, 2000
Export Citation:
Assignee:
KABUSHIKI KAISHA KOBE SEIKO SHO
Nippon Barber Co., Ltd.
Shinko Steel Wire Industry Co., Ltd.
Nippon Barber Co., Ltd.
Shinko Steel Wire Industry Co., Ltd.
International Classes:
C22C38/00; F16F1/02; C22C38/34; C22C38/46; (IPC1-7): C22C38/00; C22C38/34; C22C38/46; F16F1/02
Attorney, Agent or Firm:
Kyuichi Ueki
Etsushi Kotani
Etsushi Kotani