SPRING STEEL WIRE ROD HAVING EXCELLENT WIRE DRAWABILITY AND EXCELLENT FATIGUE CHARACTERISTICS AFTER WIRE DRAWING, AND SPRING STEEL WIRE HAVING EXCELLENT FATIGUE CHARACTERISTICS AND EXCELLENT SPRING FORMABILITY

Title:

Document Type and Number:

WIPO Patent Application WO/2012/132821

Kind Code:

A1

Abstract:

This spring steel wire rod having excellent wire drawability and excellent fatigue characteristics after wire drawing and this spring steel wire having excellent fatigue characteristics and excellent spring formability are characterized by containing 0.50% or more but less than 0.70% of C, 1.0-2.5% of Si, 0.50-1.50% of Mn, 0.5% or less of Cr (including 0%), 0.0010-0.0050% of B, 0.005% or less of N (excluding 0%), 0.020% or less of P (excluding 0%), 0.020% or less of S (excluding 0%), 0.03% or less of Al (excluding 0%) and 0.0020% or less of O (excluding 0%), with the balance made up of iron an unavoidable impurities, and are characterized in that the area ratio of the pearlite structure in the entire structure is 85% or more.

Inventors:

OURA HIROSHI
YOSHIHARA NAO

Application Number:

PCT/JP2012/055994

Publication Date:

October 04, 2012

Filing Date:

March 08, 2012

Export Citation:

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Assignee:

KOBE STEEL LTD (JP)
OURA HIROSHI
YOSHIHARA NAO

International Classes:

C22C38/00; C22C38/34; C22C38/54; F16F1/02; C21D8/06; C21D9/52

Foreign References:

JP2002180199A	2002-06-26
JP2007039800A	2007-02-15
JP2006028619A	2006-02-02
JP2002180200A	2002-06-26
JP2009024245A	2009-02-05

Other References: