STEEL WIRE ROD FOR HARD-DRAWN SPRING, WIRE DRAWING ROD FOR HARD-DRAWN SPRING, HARD-DRAWN SPRING AND METHOD FOR PRODUCING THE HARD-DRAWN SPRING

Japanese Patent JP3940264

B2

PROBLEM TO BE SOLVED: To provide a steel wire rod and a wire drawing rod for a spring for producing a hard-drawn spring which exhibits excellent fatigue strength and permanent set resistance in fatigue equal to those of a spring using an oil tempered steel wire, the hard-drawn spring, a useful method for producing the hard-drawn spring at a low cost and the like.
SOLUTION: The steel wire rod for a hard-drawn spring has a composition containing, by mass, 0.5 to <0.7% C, 1.6 to 3% Si, 0.5 to 1.5% Mn, 0.05 to 0.5% Ni, 0.05 to 1.5% Cr and 0.05 to 0.25% V, and in which the area ratio Rp of the pearlitic structure satisfies the following inequality (1): Rp (area %)≥55×[C]+61...(1); wherein, [C] denotes the content (mass%) of C.

JPH10277773	METHOD OF WELDING EXECUTION FOR STAINLESS STEEL TUBE
WO/2013/002441	HEAT-HARDENED STEEL WITH EXCELLENT CRASHWORTHINESS AND METHOD FOR MANUFACTURING HEAT-HARDENABLE PARTS USING SAME

Nobuhiko Ibaraki
Jun Inada
Sumie Suda
Takamura Norito
Tendou Satoru
Fujiwara Tadayoshi
Jimbo Tetsuo

JP2000387640A

July 04, 2007

December 20, 2000

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KABUSHIKI KAISHA KOBE SEIKO SHO
Nippon Barber Co., Ltd.
Shinko Steel Wire Industry Co., Ltd.

C22C38/00; F16F1/02; C21D7/02; C21D7/06; C21D9/02; C22C38/46; (IPC1-7): C22C38/00; C21D7/02; C21D7/06; C21D9/02; C22C38/46; F16F1/02

Kyuichi Ueki
Etsushi Kotani

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