Method for manufacturing spring having high nitrided properties

Details Method for manufacturing spring having high nitrided properties Method for manufacturing spring having high nitrided properties

1996-03-07

1997-11-04

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148230, 148580, 148908, C23C 826, C21D 902, C21D 106

Patent

active

056835213

ABSTRACT:
A method for forming a spring which can reduce variations in the surface hardness and the thickness of the hardened layer when the spring is nitrided. Before nitriding the spring, the thickness of an oxide film formed on the surface of the spring is reduced to 1.5 .mu.m or less by electropolishing or any other suitable means so that the residual stress of the spring will be -5 kgf/mm.sup.2 to 5 kgf/mm.sup.2 near its surface. With this arrangement, it is possible to increase the surface hardness and the thickness of the nitrided layer of the spring obtained by nitriding.

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