LESCALLOY NITRALLOY N Vac-Arc is an age hardenable nitriding steel. Core strength is developed by age hardening while the surface is being nitrided. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming and heat treating. Filing Code: SA-445. Producer or source: Latrobe Steel Company.