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The effects of quenching temperature, cooling pattern. temper temperature and temper times on the structure and properti-es of high speed steel (HSS) rolls have been investigated. The results show that, when the quenching temperature is lower than1050℃ the hardness of HSS increases with the quenching temperature increasing in oil cooling, but when the quenching temperatureexceeds 1100℃ the hardness decreases. In the conditions of salt bath cooling and air cooling, the effect of quenching temperature onthe hardness is similar to the above law, but the quenching temperature obtaining the highest hardness is higher than that in oil cool-ing. When the temper temperature below 350℃ the hardness of HSS has a little change, when above 475℃ the hardness will in-crease with the temper temperature increasing, and the highest hardness is obtained at 525℃. When the temper temperature contin-ues to increase, the hardness decreases. Twice temper has little effect on the hardness, but three times temper decreases
The results of quenching temperature, cooling pattern. Temper temperature and temper times on the structure and properti-es of high speed steel (HSS) increases with the quenching temperature increasing in oil cooling, but when the quenching temperatureexceeds 1100 ° C the hardness decreases. [0005] In the conditions of salt bath cooling and air cooling, the effect of quenching temperature on the hardness is similar to the above law, but the quenching temperature obtaining the highest hardness is higher than that in oil cool-ing. When the temper temperature below 350 ° C the hardness of HSS has a little change, when above 475 ° C the hardness will in-crease with the temper temperature increasing, and the highest hardness is obtained at 525 ° C. When the temper temperature contin-ues to increase, the decrease of hardness. Twice temper has little effect on the hardness, but three times temper decreases