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