ASTM A351/A351M:standard specification for stainless steel casting. Because of thermal instability, Grades CE20N, CF3A, CF3MA, CF8M J92900 CF3MN J92804 CF8C J92710 CF10 J92950 Carbon 0.03 0.08 0.03 0.08 0.03 0.08 0.04– 0.1 Manganese 1.50
CF8M stainless steel is the most widely used US standard austenitic stainless steel casting grade. Its equivalent type is cast 316. From the name CF8M, the letter "C" means the alloy is mainly for the purpose of corrosion resistance. The letter "F" is the approximate location on the iron-chromium-nickel (FeCrNi) ternary diagram.
A forged valve body is produced by forging and machining solid steel. The key specifications for cast steel valves body materials are ASTM A216 (WCA, WCB, WCC), ASTM A352 LCB/LCC (low-temperature), and ASTM A351 CF8/CF8M. ASTM A105, A350 and A182 cover body materials for small size (or high pressure) forged valves.
ASTM A351 CF3M. An austenitic stainless steel classified for Castings, Austenitic, for Pressure-Containing Parts. UNS# J92800 A. As with CF8M, the first character (C) means the alloy is intended for "Corrosion Resistant" service. The second character (F) is the
316/316L STAINLESS VALVES. Valves are manufactured in ASTM A182 316/316L forgings and ASTM A351 CF8/CF3 castings. Trim components can also be in UNS S31600 and AISI-SAE 316/316L. Welded end valves can be in 316 but 316L is often preferred due to the lower carbon content which avoids inter granular corrosion in the as-welded state thereby