SEAMLESS STEEL PIPE FOR HOLLOW SPRING

A seamless steel pipe for a hollow spring includes C: 0.2 to 0.7 mass%, Si: 0.5 to 3 mass%, Mn: 0.1 to 2 mass%, Cr: 3 mass% or less (excluding 0 mass%), Al: 0.1 mass% or less (excluding 0 mass%), P: 0.02 mass% or less (excluding 0 mass%), S: 0.02 mass% or less (excluding 0 mass%) and N: 0.02 mass% o...

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Bibliographische Detailangaben
Hauptverfasser:	TAMURA, Eiichi, HATANO, Hitoshi, TOYOTAKE, Kotaro, KOCHI, Takuya
Format:	Patent
Sprache:	eng ; hun
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	A seamless steel pipe for a hollow spring includes C: 0.2 to 0.7 mass%, Si: 0.5 to 3 mass%, Mn: 0.1 to 2 mass%, Cr: 3 mass% or less (excluding 0 mass%), Al: 0.1 mass% or less (excluding 0 mass%), P: 0.02 mass% or less (excluding 0 mass%), S: 0.02 mass% or less (excluding 0 mass%) and N: 0.02 mass% or less (excluding 0 mass%). A residual austenite content in an inner surface layer part of the steel pipe is 5 vol.% or less. An average grain size of a ferrite-pearlite structure in the inner surface layer part of the steel pipe is 18µm or less. A number density of a carbide having a circle equivalent diameter of 500 nm or more and being present in the inner surface layer part of the steel pipe is 1.8×10 -2 particles/µm 2 or less.