18Ni250 Maraging Steel
18Ni250 is an ultra high strength maraging steel containing about 18% nickel, along with cobalt, molybdenum, and titanium. Carbon is limited to ≤0.03%. Solution treatment forms an ultra low carbon martensitic matrix, while aging precipitates intermetallic compounds such as Fe₂Mo and Ni₃Ti for strengthening. The source describes a combination of very high strength, toughness, low distortion, and good weldability. It also retains impact and fatigue resistance at high strength and provides a degree of corrosion resistance.
Product details
Chemical composition
| 18Ni250 | C | Si | Mn | P | S | Ni | Co | Mo | Ti | Al |
|---|---|---|---|---|---|---|---|---|---|---|
| min | – | – | – | – | – | 17.0 | 7.0 | 4.6 | 0.3 | 0.05 |
| max | 0.03 | 0.1 | 0.1 | 0.01 | 0.01 | 19.0 | 8.5 | 5.2 | 0.5 | 0.15 |
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Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| Vascomax C250 Maraging 250 Alloy C250 Udimar 250 | K92890 | 1.6359 | – | F141 18Ni250 18Ni(C250) 00Ni18Co8Mo5TiAl | X1NiCoMo18-8-5 X2NiCoMo18-8-5 A64000 GR72 18Ni1700 |
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Physical properties
| Density g/cm³ | 8.0 |
|---|---|
| Thermal conductivity (100℃) λ/(W/m•℃) | 14 |
| Elastic modulus GPa | 200 |
| Electrical resistivity μΩ•m | 1.1 |
| Linear expansion coefficient a/10-6℃-1 | 10.4(20~100℃) |
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Mechanical properties
| Tensile strength Rm N/mm | ≥1758 |
|---|---|
| Yield strength RP0.2 N/mm | ≥1689 |
| Elongation % | ≥4 |
| Hardness HRC | ≥48 |
| *After aging heat treatment | |
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Applications
- Load-bearing aircraft structures
- Propulsion-system components
- Injection moulds and die-casting dies
- Deep-sea drilling equipment and subsea pipelines
- Aircraft strain-gauge balances
- High-precision sensors
- Lightweight spacecraft components
Available product forms
- Round Bar
- Wire
- Forgings
- Plate
- Strip
- Seamless Pipe
- Welded Pipe
- Capillary Tube
- Flanges
- Pipe Fittings
- Non-standard Custom Parts
Values follow the Milike materials catalogue and are provided for preliminary review. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
- Heat and batch traceability
- PMI testing available
- Cut-to-size processing
- Material certificates on request
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