STEEL WIRE FOR SPRING EXCELLENT IN FATIGUE PROPERTY AND DRAWING PROPERTY

World Intellectual Property Organization Patent

APP PUB NO WO-2008053884-A1
SERIAL NO

PCTJP2007071113

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Abstract

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A steel wire for springs which shows excellent drawing properties when used not only as a steel wire for springs for cold winding which is to be drawn, subsequently quenched/tempered, and processed into a steel spring, but also as a steel wire for springs for cold winding which is drawn and then directly processed into a steel spring. It gives a spring having excellent fatigue properties. The steel wire for springs, which is excellent in fatigue properties and drawing properties, comprises a steel containing carbon, silicon, manganese, chromium, titanium, boron, etc. in specific amounts and having boron, titanium, and nitrogen contents (wt.%) satisfying the following relationship (1): 0.03≤B/(Ti/3.43-N)≤5.0, the amount of boron in solution being 0.0005-0.0040% and the remainder being iron and incidental impurities. In the steel wire, the boron in solution is present at perlite nodule boundaries in a higher concentration.

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Patent Owner(s)

Patent OwnerAddress
KOBE STEEL LTDJPJAPAN

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Inventor(s)

Inventor Name Address
YOSHIHARA NAO -

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