SPRING STEEL AND METHOD OF MANUFACTURE FOR SAME

Title:

SPRING STEEL AND METHOD OF MANUFACTURE FOR SAME

Document Type and Number:

WIPO Patent Application WO/2011/121887

Kind Code:

A1

Abstract:

Disclosed is a high-strength spring steel which limits the depth of pitting when corroded and possesses superior resistance to pitting corrosion and corrosion fatigue properties; with a chemical composition of C greater than 0.35 wt% and less than 0.50 wt%, Si greater than 1.75 wt% and less than or equal to 3.00 wt%, Mn 0.2-1.0 wt%, Cr 0.01-0.04 wt%, P 0.025 wt% or less, S 0.025 wt% or less, Mo 0.1-1.0 wt% and O 0.0015 or less; which satisfies the condition that the value of PC calculated by PC = 4.2×([C]+[Mn])+0.1×(1/[Si]+1/[Mo])+20.3×[Cr]+0.001×(1/[N]) is greater than 3.3 and equal to or less than 8.0. Also disclosed is a preferred method of manufacture for same.

Inventors:

HONJO MINORU (JP)
HASE KAZUKUNI (JP)
KIMURA HIDETO (JP)

Application Number:

PCT/JP2011/001156

Publication Date:

October 06, 2011

Filing Date:

February 28, 2011

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
HONJO MINORU (JP)
HASE KAZUKUNI (JP)
KIMURA HIDETO (JP)

International Classes:

C22C38/34; C21D8/06; C22C38/54

Foreign References:

JP2001288530A	2001-10-19
JP2007100209A	2007-04-19
JP2007191776A	2007-08-02
JP2009256771A	2009-11-05
JP2932943B2	1999-08-09
JPH10196697A	1998-07-31
JP3896902B2	2007-03-22
JP4280123B2	2009-06-17
JP2008106365A	2008-05-08
JP2009046764A	2009-03-05

Other References: