SEDL / STP / STP987-EB / STP26242S

New Developments in the Production and Testing of Bearing Steels

Dressel, PG
Department of Research, Quality Control, and Customer Services, Long-Products, Krupp Stahl AG, Siegen,

Kremer, K-J
Department of Research, Quality Control, and Customer Services, Long-Products, Krupp Stahl AG, Siegen,

Spitzer, H
Department of Research, Quality Control, and Customer Services, Long-Products, Krupp Stahl AG, Siegen,

Vöge, H
Department of Research, Quality Control, and Customer Services, Long-Products, Krupp Stahl AG, Siegen,

Weber, L
Department of Metallurgy, Flat-Products, Krupp Stahl AG, Duisburg,

Pages: 15    Published: Jan 1988

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Abstract

The production routes for bearing steels, available in the works of Krupp Stahl AG, and developments to improve product quality and to lower production costs are described. The requirements for chemical composition, nonmetallic inclusions, and microstructure are discussed in respect to machinability and rolling contact fatigue life of bearings. Melting and refining of the bearing steel AISI 52100 (DIN 100 Cr 6) and its processing to billets, bars, and wire-rods are illustrated under the aspect of process technology developments and economical factors. The introduction of the continuous casting process and improvements in manufacturing technology will render the production of bearing steels less expensive at a high quality level. This, however, requires further research and development which should be assisted by appropriate requirements for bearing steel products.