HEAT TREATMENT OF HIGH CARBON VANADIUM HIGH SPEED STEEL FOR ROLLER

The quenching, tempering and hot hardness of the new developed high carbon, vanadium high speed steel (HSS) for roller were studied The results show its peak hardness temperature is about 150 250 ℃ lower than conventional HSS, and it decreases with carbon content increasing, and at the same carbon content it increases with vanadium content increasing The hardness variation after tempering has the same trend as the conventional HSS The second hardening temperature is about 550 ℃, but the deviation of second hardening peak hardness is smaller When the second tempering occurs at the second hardening temperature, the effects of the second hardening disappear The hot hardness increases with carbon and vanadium content increasing According to the requirement of hardness on roller surface, the quenching temperature of high carbon, vanadium HSS is 950 1100 ℃,and the tempering temperature is 530 550 ℃,one tempering treatment is enough to meet the requirement