... . surface: mirror polishing. 3. process: lost wax processing. 4. material:201,304,316,316L. We are an investment casting manufacturer.My ... quality.Material: stainless steel ,carbon steel, and alloy steel.such as 301,303,304,316,316L.Process: lost wax processing, wax ... processing Material stainless steel,carbon steel,and alloy steel,such as 201,304,316,316L,303,CF8M.etc. Certification ISO9000,BCC,CQGC ...