... stainless steel (304, 316, 304L, 316L. 321)Hastalloy B & C & Alloy 20 for sizes 15 mm to 50 mm.(b ... to ASTM A 216 Gr. WCB, WCC, LCB, LCC.(c) Casting in stainless steel to ASTM A 351 Gr. CF 8 ... CF 3/CF 3M Alloy 20.Hastalloy B & C.(d) Castings in C.I. to I.S. 210 G.R.20.(e) Castings ... to lubricate.2. Body and bonnet made from high quality casting with liberal sections.3. Seatring screwed into the body ...