Maraging 250 (UNS K92890)
Maraging 250 is an age hardenable iron-nickel steel alloy melted as VIM + VAR with ultra high strength and toughness. This alloy is easily machinable in the annealed condition prior to final heat treatment. This grade has improved fracture toughness from Maraging 300 but slightly less strength. The unique properties makes it suitable for many critical aerospace applications.
Equivalent Grades
| Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
Maraging 250
C250 | – | – | – | K92890 | X1NiCoMo18-8-5 | – | – | – | – | – |
Chemical Composition, %
| Alloy | C | Si | Mn | P | S | Cr | Ni | Co | Mo | Al | Ti | Cu | Fe |
| Maraging 250 | ≤0.03 | ≤0.10 | ≤0.10 | ≤0.01 | ≤0.01 | ≤0.50 | 17.0-19.0 | 7.0-8.5 | 4.6-5.2 | 0.05-0.15 | 0.3-0.5 | ≤0.50 | Bal |
Typical Physical and Mechanical Properties (RT, Annealed+Aged)
| Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HRB |
| 8.0 | 1350-1450 | 1865 | 1725 | 12 | / |
Available Products and Specifications
| Rod, Bar, Wire and Forgings | ASTM A 538, AMS 6512 |
| Plate, Sheet and Strip | – |
| Pipe and Tube | – |
| Welding Product | – |
| Others | – |
Features
- Excellent Mechanical Properties
- Excellent Workability
Applications
Commercial applications for this engineering material include:
- Missile casings
- Tooling
- Ordnance mounting blocks
- High performance
- Autosport components
- CouplingsJet engine and helicopter drive shafts
- Load cells
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