stainless steel pump impeller parts investment casting: material:stainless steel standard:ASTM.DIN.JJIS.BS ect stainless steel pump impeler parts investment casting:1.Quality standard: ISO9001:20002.Technique ... blasting; Clearing and finishing; Heat treatment; Correction and inspectionMaterialSS:303,304,304L,316,316L,CF8,CF3,CF8M,CF3M,1.4308,1 ...