Coil spring resistive to delayed fracture and manufacturing meth

Details Coil spring resistive to delayed fracture and manufacturing meth Coil spring resistive to delayed fracture and manufacturing meth

1998-03-12

2000-01-25

Jones, Deborah

Stock material or miscellaneous articles

All metal or with adjacent metals

148208, 148212, 148215, 148230, 148233, 148580, 148599, 148660, 148901, 148908, 267166, 428592, 428906, B21F 3500, C21D 902

Patent

active

060176415

ABSTRACT:
A coil spring made of an oil-tempered steel wire with internal hardness of more than Hv 550 in cross-section, the surface hardness of the oil-tempered steel wire being determined in an extent between Hv 420 in a minimum value and hardness defined by subtraction of Hv 50 from the internal hardness in a maximum value.

REFERENCES:
Nishimura et al, SAE Technical Paper Series No. 890777, The Engineering Society for Advancing Mobility Land Sea Air and Space, "The Valve Springs Carbo-Nitrided at a High Temperature for High Speed Engines", International Congress and Exposition Detroit, Michigan, Feb. 27-Mar. 3, 1989.

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