Thermal treatment process of hollow drill rod

The present invention relates to a thermal treatment process of a hollow drill rod, which belongs to the thermal treatment process, and is characterized in that a feeding frame is used, the 40SiMnCrNiMo hollow drill rod with a rolling state is subjected to the processes of preheating, heat penetrati...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	ZHANG XINQI, XIAO DAOCUN, LI MINGSUO
Format:	Patent
Sprache:	chi ; 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:	The present invention relates to a thermal treatment process of a hollow drill rod, which belongs to the thermal treatment process, and is characterized in that a feeding frame is used, the 40SiMnCrNiMo hollow drill rod with a rolling state is subjected to the processes of preheating, heat penetrating, nitrogen cooling and slow cooling by a heating furnace to complete normalizing treatment and cooling control, thereby the drill rod obtains a suitable metallographic structure, and the mechanical properties of impact resistance and fatigue resistance can be improved. The energy can be saved by 30%, and the drilled footage of the drill rod is increased by one time.