18Ni350 Maraging Steel
18Ni350 is an ultra high strength maraging steel containing 18% to 19% nickel, 11% to 12.5% cobalt, 4% to 5% molybdenum, and 1.2% to 1.45% titanium. Carbon is limited to ≤0.03%. Solution treatment forms an ultra low carbon martensitic matrix, while aging produces intermetallic precipitates such as Ni₃Mo and Fe₂Mo. The source lists strength of ≥1500 MPa, high toughness, low distortion, good weldability, impact and fatigue resistance, and a degree of corrosion resistance.
Product details
Chemical composition
| 18Ni350 | C | Si | Mn | P | S | Ni | Co | Mo | Ti | Al |
|---|---|---|---|---|---|---|---|---|---|---|
| min | – | – | – | – | – | 18.0 | 11.5 | 4.6 | 1.3 | 0.05 |
| max | 0.03 | 0.1 | 0.1 | 0.01 | 0.01 | 19.0 | 12.5 | 5.2 | 1.6 | 0.15 |
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Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| Vascomax C350 Maraging 350 Alloy C350 | K93540 K93160 | 1.6355 1.6356 | – | 18Ni35 018Ni(C350) 00Ni18Co12Mo5Ti2Al | 18Ni2400 |
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Physical properties
| Density g/cm³ | 8.0 |
|---|---|
| Elastic modulus GPa | 210 |
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Mechanical properties
| Tensile strength Rm N/mm | ≥2344 |
|---|---|
| Yield strength RP0.2 N/mm | ≥2275 |
| Elongation % | ≥2.8 |
| Hardness HRC | ≥56 |
| *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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