Director of process technology, Thyssen Edelstahl Werke AG, Krefeld,
Manager of quality control, Thyssen Edelstahl werke AG, Witten,
Manager of quality control, Thyssen Stahl AG, Duisburg,
Manager of quality control, Wälzlagerrohr GmbH, Krefeld,
Pages: 15 Published: Jan 1988
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.
melting procedures, aluminium deoxidation, calcium treatment, macroinclusions, microinclusions, rating methods, fatigue behavior, machinability, ingot and continuous casting, segregation, basic oxygen furnace (BOF)
Paper ID: STP26246S