Maraging 350/ Maraging C350/Vascomax C350 Maraging C350 is a nickel-maraging alloy that is relatively soft, but extremely tough. Vascomax C350 can also be readily machined and formed to your specifications. In addition, the aging process of Maraging steel raises the hardness to a level sufficient for many tooling applications. Maraging 350 has excellent mechanical properties, workability and heat treatment characteristics. Maraging 350 is used for missile and rocket motor cases, landing and takeoff gear components, high performance shafting, gears and fasteners.