18Ni300 Maraging Steel
18Ni300 is an ultra high strength maraging steel containing 18% to 19% nickel, together with cobalt, molybdenum, and titanium. Carbon is limited to ≤0.03%. Strengthening comes from an ultra low carbon martensitic matrix formed by solution treatment and intermetallic precipitates such as Ni₃Mo and Fe₂Mo formed during aging. The source lists strength of ≥2000 MPa, high toughness, low distortion, and good weldability. It also retains impact and fatigue resistance at high strength and offers a degree of corrosion resistance.
Product details
Chemical composition
| 18Ni300 | C | Si | Mn | P | S | Ni | Co | Mo | Ti | Al |
|---|---|---|---|---|---|---|---|---|---|---|
| min | – | – | – | – | – | 18.0 | 8.5 | 4.6 | 0.5 | 0.05 |
| max | 0.03 | 0.1 | 0.1 | 0.01 | 0.01 | 19.0 | 9.5 | 5.2 | 0.8 | 0.15 |
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Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| VascomaxC300 Maraging 300 Alloy C300 | K93120 | 1.6358 1.6354 | – | 18Ni300 18Ni(C300) 00Ni18Co10Mo5TiAl 00Ni18Co9Mo5TiAl | X2NiCoMo18-9-5 TM210A GR73 18Ni1900 EZ2NKD18 |
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Physical properties
| Density g/cm³ | 8.0 |
|---|---|
| Elastic modulus GPa | 200 |
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Mechanical properties
| Tensile strength Rm N/mm | ≥1930 |
|---|---|
| Yield strength RP0.2 N/mm | ≥1896 |
| Elongation % | ≥4 |
| Hardness HRC | ≥52 |
| *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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