... weld,sintering ,polishing,sand blast4.bottom case:silver-alloy brazing,tin soldering5.other sizes and types are ... N Material:Brass,CRS,Stainless steel,Kovar,Copper-Nickel-Zinc Alloy,Iron nickel alloyProduction process:Stamping,Forming,Cutting,Punching,Positioning, ... ,electroplate,electroless plating,electrolytic,passivation,etc.Plating Type:Nickel Plating,Tin Plating,Zinc Plating,Gold plating,Coating ...