... than silicon controlled, Φ60mm-Φ100mm bar stock through heating 5.chain,chain wheel heat treatment 6.Dia.Φ3m,weight 80ton gear quenching 7 ... . copper bar annealing, wire annealing 10. machine tool guideways gear,chain wheel quenching 11.elbow heating tube end expansion and necking down ... alloy,red copper annealing,welding 7.metal smelting 8.gear, chain wheel quenching