Special hardened steel used in fabrication of centrifuge rotors and rocket motors. Typically, gas centrifuge programs seek a controlled 350 grade maraging steel.

Extremely hard alloy commonly used in woods as face inserts.

A high alloyed steel that is hardened by both martensite transformation and by age hardening. See Age Hardening, Martensite.

Maraging steel is an iron alloy which is known for possessing superior strength without losing malleability. The iron base is alloyed principally with a large percentage of nickel to produce a very specific heat-treatment product. Other alloying elements include molybdenum, aluminum, copper and titanium and are added to produce intermetallic precipitates.