SLOW COOLING METHOD FOR BEARING STEEL BILLET

PURPOSE: To reduce surface hardness and to prevent the occurrence of a ferrite decarburized layer while obviating the necessity of additional costs such as reheating cost at the time of slow cooling for a billet. CONSTITUTION: A billet, prepared by cogging a bearing steel, is cut into regular size,...

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Bibliographische Detailangaben
Hauptverfasser:	KITAMURA YASUFUMI, WAKABAYASHI TOMOFUMI, TORII MIKIHIRO, KUBO YASUSHI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
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Beschreibung
Zusammenfassung:	PURPOSE: To reduce surface hardness and to prevent the occurrence of a ferrite decarburized layer while obviating the necessity of additional costs such as reheating cost at the time of slow cooling for a billet. CONSTITUTION: A billet, prepared by cogging a bearing steel, is cut into regular size, and this bearing steel billet is cooled slowly in order to facilitate cold working in the following stage. In this slow cooling method, the surface of the billet, cut into regular size, is cooled rapidly from a γ-region temp. of 750-900 deg.C down to