... kinds of investment castings per your drawings and samples. investment casting partFeatures:1) Process: a) Silica sol shelling-making process b) Lost ... , CH10, CH20 iii) DIN: 1.3955, 1.4308, 1.4408, 1.4581 iiii) BS: 304C15, 316C12, 316C15 b) Heat - resistant steel: HH, HK, HE, HI ... , milling, drilling, planning, grinding machines and testing facilities Investment stainless steel Casting Part