... quenching,High-frequency hardening,quenched and tempered,tempering,carburizing,nitriding,carbonitriding and so on.6.Surface Treatment:Include plating ... special steel, stainless steel, brass, bronzs ,aluminum and so on . 3)Lead time the samples will be around ... assembly workshop,power supply& machine maintain workshop,store and so on),excellent workers, strict quality management system. Jademetal ...