... sol shelling-making process b) excellent quality and cheap stainless steel investment casting partfeatures:1) Process:a) Silica sol shelling- ... processc) Complex shelling processd) Soluble glass process2) Materials:a) Stainless steel:i) 304, 316, 316L, 309, 310, 312, 347, 410 ... : 304C15, 316C12, 316C15b) Heat - resistant steel: HH, HK, HE, HI, HFc) Carbon steel and alloy steel: ASTM 415-205, 80-40, LCA ...