1)26 years experience on OEM precision casting 2)ISO9001:2008, CE/PED Certified by ... treatment:anneal, quenching, normalizing, carburizing,polishing, platingMachiningCNC and NC machining, turning, milling, drilling, boring, threading, grinding machines and ... defected surface with grinding wheel. Heat treatmentHeat treat the casting by nomalizing, annealing, quench+tempering, induction quenching, case ...