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Maraging C250 Plate

Maraging 250™ plate is a vacuum induction melted and vacuum arc melted, low-carbon, nickel-cobalt-molybdenum high temperature alloy.

Maraging steels sheet are supplied in the annealed condition where the microstructure consists of fine martensite. Aging to achieve final properties is a relatively low temperature procedure giving the required high strength and toughness. This low temperature treatment allows for machining close to final size since distortion is minimal. Maraging steels plate also retain their strength up to 450◦C (840◦F), can be nitride and have a corrosion resistance similar to that of standard martensitic stainless steels.

Maraging C250 plate is the lowest strength of the maraging steels stocked by Calico . Typical usage is in jet engine shafts, missile casings, ordinance mounting blocks and tooling.


  • Meets AMS 6512 specifications
  • Meets ASTM A 538 specifications
  • Meets MIL-S-46850D specifications
  • Meets UNS K 92890 specifications
  • Extremely tough
  • Relatively soft
  • Maintains high strength & toughness
  • Ultrahigh tensile strength
  • Resists corrosion & crack propagation
  • Excellent cleanliness & polishability
  • Readily weldable


  • Missile & rocket motor cases
  • Munitions
  • Landing gear components
  • Aerospace
  • Extrusion tooling
  • Die casting
  • High performance shafting, gears & fasteners

Also see 15-5 stainless steel plate


  • UNS : K92890
  • Specifications : AMS 6520

Chemical Composition

Weight% Ni Co Mn Si C Al Mo S P Ti Fe Cr Cu
C250 17.0 / 19.0 7.0 / 8.5 0.10 max 0.10 max 0.03 max 0.05 / 0.15 4.6 / 5.2 0.010 max 0.010 max 0.3 / 0.5 Bal 0.50 0.50

Mechanical Properties

Material Condition Ultimate Tensile (min) Yield Strength (Min) Elongation in 4D % (min) Hardness
Mpa Ksi Mpa Ksi
Alloy Maraging C250 After Maraging heat treatment 900°F 1758 255 1724 250 6 ≥ 48 HRC

Calico Metal Alloys LLP export products to countries like UAE, Bahrain, Italy, Indonesia, Malaysia, United States, Mexico, Chine, Brazil, Peru, Nigeria, Kuwait, Jordan, Dubai, Thailand (Bangkok), Venezuela, Iran, Germany, UK, Canada, Russia, Turkey, Australia, New Zealand, Sri Lanka, Vietnam, South Africa, Kazakhstan & Saudi Arabia.

HASTELLOY, HAYNES and C-22 are registered trade names of Haynes International, Inc., MONEL & INCONEL are registered trade names of INCO family of companies., NITRONIC is a registered trade name of Armco Inc., CARPENTER & 20Cb-3 are registered trade names of Carpenter Technology Corporation., FERRALIUM is a registered trade name of Langley Alloys, LTD.