| 摘要 |
The present invention related to a process for manufacturing plaintive steel for hot forging with excellent machinability to control component of steel hot processing condition and cooling condition.The present invention comprised a process for destroying casting tissue by hot rolling steel which composed C:0.30-0.45%, Si:0.40-0.80%, Mn:0.8-1.3%, Mo:0.01-0.1%, V:0.05-0.20%, Ti:0.01-0.04%, AL:0.01-0.10%, N:0.005-0.030%, P:0.030% below, S:0.01-0.10%, remainder Fe, the rest impurities contained inevitably with the shape of cycle rod or square rod; a process of finish forging in the temperature of over 1000 deg. C by operating drop forging in hot after reheating in 1200-1300 deg. C; a process of air cooling after cooling with the cooling rate of 10-200 deg. C/min to 400 deg. C.
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