casting: 1.stainless steel valve discs 2. 20 years casting experiences 3. ISO9001 4."Excellent Supplier of Sulzer" : High manganese steel castings:MaterialHigh manganese steel castingsProcessInvestment casting, ... sand blasting, t6-heat treatment, painting, powder coating, anodizing, electroplating, mirror polishing.Testing ability spectrograph,heat treatment ,Mechanical properties test.Service OEM ...