Alloy 250/UNS K92890 / Maraging 250/UNS K92940 Alloy 250 (UNS K92890 / Maraging 250) is an age-hardenable iron-nickel steel. Alloy 250 combines ultra-high strength (1800MPa), good toughness, readily machinable in pre-aged condition, excellent transverse properties and resistance to crack propagation. Maraging 250 (also referred to as Maraging C250 and Vascomax 250) is a vacuum induction melted and vacuum arc melted, low-carbon, nickel-cobalt-molybdenum high temperature alloy. This maraging steel can attain yield strengths in excess of 240 ksi (1655 MPa) through a simple, low temperature heat treatment. Maraging 250 exhibits good ductility at high strength levels and is readily welded.