... 400, Monel 400 Rod 2. Valves, Pumps, Shafts, Fittings, Fasteners, Heat Exchangers 3. UNS N04400 4. ASTM, GB Monel Alloy 400A nickel ... and hydrocarbon processing equipment, valves, pumps, shafts, fittings, fasteners, and heat exchangers.Limiting Chemcial CompositionNi 63.0min, Mn2.0max, Si0.5max, Cu28 ...