... Silica sol shelling-making process b) excellent quality and cheap stainless steel investment casting partfeatures:1) Process:a) Silica sol ... 304C15, 316C12, 316C15b) Heat - resistant steel: HH, HK, HE, HI, HFc) Carbon steel and alloy steel: ASTM 415-205, 80-40, LCA, ... machining: CNC lathes, milling, drilling, planning, grinding machines and testing facilities Stainless Steel Investment Casting Part