SYMPOSIA PAPER Published: 01 January 1988

Properties of Through-Hardening Bearing Steels Produced by BOF Blowing Metallurgy and by Electric Arc Furnace with Ladle Metallurgy


This paper discusses the cleanliness of through-hardening bearing steels produced by different melting and deoxidation processes. Macroscopic cleanliness is tested by the step-down and blue fracture test, and microscopic cleanliness is classified according to three rating methods. Cleanliness values of the air-melted heats are compared with remelted steels. Oxide inclusions are related to the oxygen contents of the heats, titanium-carbonitrides to the titanium contents, and sulfide inclusions to the sulfur contents of the heats. Machinability is effected more by carbide grain sizes than by sulfur contents. Ingot- and continuous cast steels are compared on cleanliness and segregation.

Author Information

Baum, R
Thyssen Edelstahl Werke AG, Krefeld, Federal Republic of Germany
Böhnke, K
Thyssen Edelstahl werke AG, Witten, Federal Republic of Germany
Boeckers, T
Thyssen Stahl AG, Duisburg, Federal Republic of Germany
Klemp, H
Wälzlagerrohr GmbH, Krefeld, Federal Republic of Germany
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Developed by Committee: A01
Pages: 360–374
DOI: 10.1520/STP26246S
ISBN-EB: 978-0-8031-5056-0
ISBN-13: 978-0-8031-0999-5