Abstract
Using an accelerated service-simulation test, the role of nitrogen content on the rolling contact fatigue resistance of a range of En31 ball bearing steels was assessed. Nitrogen content appears to be a significant factor in steel performance. Air-melted neutral open hearth and acid open hearth materials, which were superior to air-melted basic electric arc steels, were comparatively low in nitrogen. With the basic electric arc materials there was a trend towards reduced rolling contact fatigue life with increased nitrogen content.
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