MONEL® alloy K-500 (UNS N05500) Ni 65.5 Cu 29.5 Al 2.7, Ti 0.6 Age-hardenable version of MONEL alloy 400 for increased strength and hardness. Good strength and ductility from -423 to 1200°F. Pump shafts, doctor blades and scrapers, oil-well drill collars and instruments, electronic components, springs, valve trim, fasteners.