Method for manufacturing cold-finished seamless steel pipe for integrally molded drive shaft

Provided is a cold-finished seamless steel pipe for an integrally molded drive shaft, which is obtained by cold-extracting a material pipe hot-rolled by the Mannesmann piercing method. In order to retain the maximum inner face wrinkle depth of 0.1 mm or less of the seamless steel pipe for the drive...

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Bibliographische Detailangaben
1. Verfasser:	YAMAMOTO TADAYUKI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ALLOYS AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL BEARINGS BLASTING CHEMISTRY ELEMENTS OR CRANKSHAFT MECHANISMS ENGINEERING ELEMENTS AND UNITS FERROUS OR NON-FERROUS ALLOYS FLEXIBLE SHAFTS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL ROLLING OF METAL ROTARY BODIES OTHER THAN GEARING ELEMENTS SHAFTS THERMAL INSULATION IN GENERAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	Provided is a cold-finished seamless steel pipe for an integrally molded drive shaft, which is obtained by cold-extracting a material pipe hot-rolled by the Mannesmann piercing method. In order to retain the maximum inner face wrinkle depth of 0.1 mm or less of the seamless steel pipe for the drive shaft and the maximum wrinkle depth of 0.20 mm or less of the inner face at the internal diameter reduction ratio of 30 % or more in the radially reduced portion, the material used is the steel of the kind having specific chemical compositions. This steel material is subjected to a piercing-rollingtreatment by the Mannesmann method, and is adjusted in the hole molding shape in the routine rolling after drawing-rolled, and then adjusted in the thickness treatment in the later cold-extraction. As a result, the seamless steel pipe can retain excellent torsional fatigue characteristics as the integrally molded automotive drive shaft having radially reduced portions at its two end portions, so that it can be used as a h