... wheel axles, roll valve plunger, etc.; Also available for the tempering steel use, such as cold heading bolts or large section ... , air cooling; 2. quench,880°C, water cooling, oil cooling;tempering,200°C water cooling, air coolingE condition of delivery:With ... treatment or heat treatment (annealing, is fire or high temperature tempering) state delivery. Requirements of the state should be in heat ...