... ,steel alloy(30CrMnSi,20Cr ,9310,4303and so on)exoit material:brass,bronze,phenolic,nylon,delrin and othersprocessing:machine turning,machining milling ... ·Vibratory Milling & Electropolish·Nickel Plating·Zinc Plating·Painting·Dichromate·Polished Brass·Phosphating available heat treatment:Hardening and temperingHigh Frequency QuenchingCarburizing QuenchingtemperingquenchingAnnealing ...