METHOD FOR HEAT TREATMENT OF CONNECTING ROD FORGINGS FROM ALLOYED STEELS

FIELD: metallurgy. SUBSTANCE: method includes heating of forgings up to authentication temperature, hardening, high-temperature tempering and descaling. Heating is carried out up to temperature of 860-960 C in oxidizing atmosphere with excess air coefficient of 1.25-2.25 for 60-180 min. Hardening is...

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Hauptverfasser:	MOKROUSOV JU.M, VOLODIN I.M
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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Zusammenfassung:	FIELD: metallurgy. SUBSTANCE: method includes heating of forgings up to authentication temperature, hardening, high-temperature tempering and descaling. Heating is carried out up to temperature of 860-960 C in oxidizing atmosphere with excess air coefficient of 1.25-2.25 for 60-180 min. Hardening is carried out by cooling with cooled compressed air for 6-20 min down to temperature below 320 C. Heating of connecting rod forgings from steel 40XH2MA is carried out to temperature of 900 10 C for 144 5 min with excess-air coefficient of 1.4 0.1. Cooling is lasted for 10-12 min to temperature below 320 C, and tempering is conducted at temperature of 560 10 C for 240 min. EFFECT: higher quality of articles and reduced expenditures for heat treatment. 2 cl, 1 tblf