SYMPOSIA PAPER Published: 01 January 1998

What Happens to the Fatigue Limit of Bearing Steel Without Nonmetallic Inclusions? : Fatigue Strength of Electron Beam Remelted Super Clean Bearing Steel


This paper has two objectives. The first is to propose a new inclusion rating method based on statistics of extreme. The new inclusion rating method is applied to the evaluation of inclusions contained in two super clean bearing steels with a total oxygen level of 5ppm and 8ppm.

The second objective is to investigate the critical lower bound of inclusion size which influences the fatigue limit. For this purpose, a special steel with extremely low inclusion content, the electron beam remelted super clean bearing steel(EB-CHR), was prepared. It is shown that by decreasing the size of inclusions, the detrimental effect of inhomogeneities larger in size than inclusions, becomes more important. The small inhomogeneity is thought to be a local imperfectly heat- treated structure, bainite.

Author Information

Murakami, Y
Toriyama, T
Kyushu University, Fukuoka, Japan
Tsubota, K
Sanyo Special Steel Co., Himeji, Japan
Furumura, K
Material Research Center, NSK Ltd., Fujisawa, Japan
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Developed by Committee: A01
Pages: 87–105
DOI: 10.1520/STP12122S
ISBN-EB: 978-0-8031-5381-3
ISBN-13: 978-0-8031-2421-9