... .4.Assembling:assembly lines for complex product5.Heat Treatment:Include quenching,High-frequency hardening,quenched and tempered,tempering,carburizing, ... nitriding,carbonitriding and so on.6.Surface Treatment:Include plating of Ni,Cr3+,Zn-Ni,Dacromet,No chrome ... :common carbon steel, special steel, stainless steel, brass, bronzs ,aluminum and so on . 3)Lead time the samples will be ...