Improved High Tensile Strength Stainless Steel Fine Wire for Spring

Abstract

Recently, the high tensile strength fine wire for precise spring is required more higher strength, because the spring for mechanical parts of electrodevice and electronic instrument demanded more compact in its design.
Usually, the fine wire for precise spring had to high elasticity, fatigue, especially anti-corrosive properties.
Typical hard drawn stainless steel fine wire has superior the anti-corrosive and heat resistant properties but some limitation to allow high design stress for spring resulted from lower yield strength compared with typical piano wire.
The main concern of this paper is to make a series of mechanical, fatigue, anti-corrosive properties of the improved hard drawn high tensile strength stainless steel wire (New type wire) made from special wire drawing method compared with typical SUS 304-WPB grade wire and typical piano wire.
In conclusion:
(1) The new type wire has equivalent the value as the tensile strength of SWP-B grade of piano wire in JIS.
(2) The spring of the new type wire has more improvement of the spring properties after stress-relieved (bluing).
(3) The spring of the new type wire has remarkable progress in the endurance limit of fatigue and the deformation of the tested spring compared with typical SUS 304-WPB spring.