SEDL / STP / STP987-EB / STP26246S

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

Baum, R
Director of process technology, Thyssen Edelstahl Werke AG, Krefeld,

Böhnke, K
Manager of quality control, Thyssen Edelstahl werke AG, Witten,

Boeckers, T
Manager of quality control, Thyssen Stahl AG, Duisburg,

Klemp, H
Manager of quality control, Wälzlagerrohr GmbH, Krefeld,

Pages: 15    Published: Jan 1988

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Abstract

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.