Steel for ball and roller bearings

US5261975A · kind A · utility

Assignee

• AB SKF · SE

Inventors

• Per-Olof Sorstrom · Kungälv, SE
• Thore Lundh · Hofors, SE
• John Beswick · Montfoort, NL
• Frank Hengerer · Schweinfurt, DE

Key dates

• Filing date: Jun 24, 1992
• Grant date: Nov 16, 1993
• Expiry date: Jun 24, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S384/912
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Steel for ball and roller bearings and similar applications, containing, in % by weight: ______________________________________ 0.70-0.95% Carbon 0.01-0.30% Silicon 0.15-0.50% Manganese 0.5-2.5% Chromium 0.10-1.5% Molybdenum max. 0.25% Vanadium ______________________________________ the rest up to 100% being iron and other residual elements normally present in steel, and with the further proviso that the total area percentage of oxide inclusions must not exceed 0.0012%, that the area percentage of titanium-carbonitrides must not exceed 0.0015%, and that the area percentage of sulphide inclusions must not exceed 0.030%, the respective area percentages being measured according to the inclusion rating method defined in the Swedish Standard SS111116, wherein the field of vision shall be 0.8 mm and the number of fields of vision to be surveyed shall be at least 1000.