STEEL FOR NITRIDED SPRING EXCELLENT IN FATIGUE STRENGTH AND NITRIDED SPRING

PURPOSE:To produce a steel for nitrided spring excellent in fatigue strength and the spring by subjecting a low alloy steel material, in which the size of non-metallic inclusions in the cross section in a rolling direction is specified, to nitriding treatment. CONSTITUTION:A steel material, which ha...

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Bibliographische Detailangaben
Hauptverfasser:	KURAMOTO HIROSHI, KAWAGUCHI YASUNOBU, SATO HITOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PURPOSE:To produce a steel for nitrided spring excellent in fatigue strength and the spring by subjecting a low alloy steel material, in which the size of non-metallic inclusions in the cross section in a rolling direction is specified, to nitriding treatment. CONSTITUTION:A steel material, which has a composition containing, by weight, 0.3-0.7% C, 0.8-4% Si, 0.2-1.5% Mn, 0.4-3% Cr, 0.02-0.7% sol.Al, and