Description
Overview Of M300
M300 (also known as Maraging Steel 300 or 1.2709) is a low-carbon martensitic age-hardening steel widely used in additive manufacturing (AM), aerospace, and tooling industries. It combines ultra-high strength, exceptional toughness, and minimal distortion during heat treatment, making it ideal for critical components requiring both precision and durability.
Powder Chemical Composition(wt,-%)
| Element | C | Cr | Ni | Co | Mo | Al |
| M300 | ≤0.03 | ≤0.50 | 17.00-
19.00 |
8.50-9.50 | 4.50-5.20 | 0.05-0.15 |
| Element | Ti | S | P | O | N | Fe |
| M300 | 0.50-0.80 | ≤0.010 | ≤0.010 | ≤0.025 | ≤0.015 | Bal |
Physical Properties
| Grade | Size | Particle size distribution | Hall flow
rate |
Bulk
density |
Tap
density |
||
| D10(μm) | D50(μm) | D90(μm) | |||||
| M300 | 15-53μm | ≥15 | 30-40 | ≤60 | ≤20s/50g | ≥4.0g/cm³ | ≥4.5g/cm³ |
Mechanical Properties
| Grade | Hardness
(HRC) |
Tensile strength
(Ob/Mpa) |
Yield strength
(Opo.2/Mpa) |
Elongation at break(δ5/%) |
| M300 | 52-56 | ≥2000 | ≥1950 | ≥6 |
Heat Treatment Recommendation
| Grade | Recommended HT solution |
| M300 | 810±10℃/1H/AC+ 500±10℃/3H/AC |
Advantages
| Aspect | 18Ni300 | Ti-6Al-4V | Stainless 316L |
| Strength | Ultra-high (2000 MPa) | Moderate (1000 MPa) | Low (600 MPa) |
| Heat Resistance | Excellent (up to 500°C) | Good (up to 400°C) | Poor (oxidizes above 300°C) |
| Machinability | Good post-aging | Poor | Excellent |
| Cost | High (due to Co/Ni content) | Very High | Moderate |
Key Features
Age-Hardening Mechanism
● Gains ~80% strength increase after aging (heat treatment at 480–510°C) due to precipitation of intermetallic phases (Ni₃Ti, Ni₃Mo).
● Minimal dimensional change during aging ensures precision for complex geometries.
Additive Manufacturing Suitability
● Compatible with laser powder bed fusion (LPBF) and directed energy deposition (DED).
● Low crack susceptibility and excellent layer bonding.
High-Performance Applications
● Aerospace: Rocket engine parts, landing gear components, and structural brackets.
● Tooling: Injection molds, die-casting tools, and high-wear cutting inserts.
● Defense: Missile casings and armor-piercing systems.
● Medical: Surgical instruments (post-polishing and passivation).
Environmental Resistance
● Moderate corrosion resistance (outperforms carbon steels but less than austenitic stainless steels).
● Stable up to 00°C; prolonged high-temperature exposure causes over-aging.
Primary Applications
● Aerospace & Defense:Fabrication of turbine blades, combustion chambers, and exhaust nozzles for jet engines via additive manufacturing (AM) or powder metallurgy.
Structural components in rocket engines and high-pressure fuel systems.
● Energy Sector:Heat exchangers and reactor vessels in nuclear power plants.
Components for gas turbines and fossil fuel power generation systems.
● Chemical & Petrochemical Processing:Valves, pumps, and reactor linings resistant to aggressive chemicals and high-pressure environments.
● Marine & Offshore Engineering:Corrosion-resistant fasteners, pipes, and underwater equipment for harsh marine conditions.
● Automotive & Industrial Manufacturing:High-performance engine parts (e.g., exhaust manifolds) and wear-resistant tooling.
● Medical & Biomedical:Implants and surgical instruments requiring biocompatibility and durability.
