... Silica sol shelling-making process b) excellent quality and cheap stainless steel investment casting partfeatures:1) Process:a) Silica sol shelling- ... wax processc) Complex shelling processd) Soluble glass process2) Materials:a) Stainless steel:i) 304, 316, 316L, 309, 310, 312, 347, ... lathes, milling, drilling, planning, grinding machines and testing facilities Stainless Steel Investment Casting Part