Alloy steel precision casting/investment casting 1.ISO 9001 2.Strict QC ... of water glass precision castings ,including carbon , alloy and stainless steel .We cast especially large parts as per drawing,to meet ... inspection,Material, Dimensions ,heat treatment report ,UT ,MT, X-ray .Mechanical Properties, ect 7 Quality control :ISO 9001:2008, CE ,inner control ...