BEARING STEEL MATERIAL WITH EXCELLENT ROLLING FATIGUE PROPERTY AND BEARING PART

Title:

BEARING STEEL MATERIAL WITH EXCELLENT ROLLING FATIGUE PROPERTY AND BEARING PART

Document Type and Number:

WIPO Patent Application WO/2014/017362

Kind Code:

A1

Abstract:

A bearing steel material which contains 0.8-1.1 mass% C, 0.15-0.8 mass% Si, 0.1-1.0 mass% Mn, 1.3-1.8 mass% Cr, up to 0.05 mass% P (0 mass% is excluded), up to 0.015 mass% S (0 mass% is excluded), 0.0002-0.005 mass% Al, 0.0002-0.0020 mass% Ca, 0.0005-0.010 mass% Ti, up to 0.0080 mass% N (0 mass% is excluded), and up to 0.0025 mass% O (0 mass% is excluded). The steel material contains oxide inclusions which have an average composition that comprises, in terms of mass%, 20-50% CaO, 20-50% Al2O3, 20-70% SiO2, and 3-10% TiO2.

Inventors:

SHIMAMOTO MASAKI
SHINDO YOSUKE
KAIZUKA MASAKI
OWAKI AKIHIRO
KIMURA SEI
DEURA TETSUSHI
SUGIMURA TOMOKO

Application Number:

PCT/JP2013/069445

Publication Date:

January 30, 2014

Filing Date:

July 17, 2013

Export Citation:

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Assignee:

KOBE STEEL LTD (JP)

International Classes:

C22C38/00; C22C38/28; F16C33/32; F16C33/34; F16C33/62; C21D9/40

Foreign References:

JP2010007092A	2010-01-14
JPS62130258A	1987-06-12
JP2009030145A	2009-02-12
JP2009174033A	2009-08-06
JP2009007643A	2009-01-15
JP2002194497A	2002-07-10
JP2009030145A	2009-02-12
JP2010202905A	2010-09-16
JP2009052111A	2009-03-12

Other References: