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Technical Data Sheet
LPBF · Maraging Tool Steel
18Ni300 Maraging Steel
1.2709 · 18Ni-300 · M300 · UNS K93120
Cobalt-nickel maraging tool steel that ages to 50-54 HRC. Outstanding strength, toughness and dimensional stability — the metal for mould inserts with conformal cooling and high-strength tooling.
LPBF
18Ni300
18Ni300~2000 MPaUTS (aged)
50-54 HRCHardness (aged)
~1900 MPaYield (aged)
8.0 g/cm³Density
Material overview
18Ni300 is a martensitic, age-hardenable maraging steel (Fe-Ni-Co-Mo) printed fully dense by LPBF. As-built it is tough and readily machined; a single low-temperature ageing cycle (~490 °C) precipitates intermetallics that raise strength past 1,900 MPa and hardness to 50-54 HRC with minimal distortion. The combination of high strength, polishability and conformal-cooling freedom makes it the standard alloy for injection-mould inserts, dies and high-load tooling.
Highlights
- Aged UTS: ~1,950-2,050 MPa
- Hardness: 50-54 HRC after ageing
- Tooling: conformal-cooling inserts
- Stability: low distortion on ageing
Ideal applications
Injection-mould insertsConformal coolingDies & toolingStampingHigh-strength structuralAerospace tooling
Mechanical properties
| Property | As-built | Aged |
|---|---|---|
| Ultimate tensile strength | ~1,100 | ~2,000 |
| Yield strength (Rp0.2) | ~1,000 | ~1,900 |
| Elongation at break (%) | ~10 | ~4 |
| Hardness (HRC) | ~33 | 50-54 |
| Young’s modulus (GPa) | ~180 | ~190 |
Physical & thermal
| Property | Value | Unit |
|---|---|---|
| Density | 8.0-8.1 | g/cm³ |
| Melting range | ~1,413 | °C |
| Thermal conductivity | ~15-20 | W/m·K |
| Layer thickness | 20-60 | µm |
| As-built roughness Ra | 6-12 | µm |
| Composition | Fe·Ni18·Co9·Mo5·Ti0.7 | wt% |
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Property data per the material manufacturer’s technical datasheet and Carpenter Additive / industry references (on file). Values are indicative and may vary with machine, parameters, orientation and post-processing — not a guaranteed specification or a legally binding MSDS; SDS available on request. © 2019–2026 Additive Plus · All rights reserved. AO Metal is our trademark.