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18ni 300 maraging steel properties
AISI 18ni300 Maraging steel is a high-strength iron-based alloy containing 18% nickel, 2% molybdenum, 8% cobalt and other elements such as titanium, aluminum and tungsten. It has the characteristics of corrosion and erosion resistance, high strength, high toughness, fatigue resistance and high elasticity. Widely used in aerospace, ships, underwater vehicles, pipeline systems, offshore platforms and other Marine equipment and high-performance industrial applications
Chemistry Information
Element
Percentage
Al0.1B0.003 maxCo9C0.03 maxFe67Mn0.1 maxMo4.8P0.01 maxNi18.5Si0.1 maxS0.01 maxTi0.6Zr0.01
|
Physical Properties 300 |
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|
Annealed |
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|---|---|---|---|---|---|
| Density | 0.289 lb/in3 | ||||
| Ultimate Tensile Strength | 150 ksi | ||||
| Yield Tensile Strength | 110 ksi | ||||
| Shear Modulus | 10,600 ksi | ||||
| Shear Strength | 92 ksi | ||||
| Hardness Rockwell | Brinell | B106 | 294 | ||||
| Elongation at Break Percentage | 18% | ||||
| Reduction of Area | 61.3% | ||||
| Modulus of Elasticity | 27,500 ksi | ||||
| Poisson's Ratio | 0.30 | ||||
| Melting Point | 2,600-2,690 °F | ||||
| Specific Heat | 1.1 x 10^-1 BTU/lb-°F | ||||
| Thermal Conductivity | 176 BTU-in/hr-ft^2-°F | ||||
Chemical Composition of 18Ni 300 Maraging Steel
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤0.03 |
| Chromium (Cr) | ≤0.3 |
| Nickel (Ni) | 18 |
| Molybdenum (Mo) | 4.8 |
| Cobalt (Co) | 9.0 |
| Titanium (Ti) | 0.7 |
| Aluminum (Al) | 0.1 |
| Silicon (Si) | ≤0.1 |
| Phosphorus (P) | ≤0.01 |
| Sulfur (S) | ≤0.01 |
| Iron (Fe) | Balance |
Mechanical Properties: In the heat-treated condition, the yield strength can reach 2065 MPa, the tensile strength is 2225 MPa, the elongation after fracture is 4.2%, the elastic modulus is 142.5 GPa, and the microhardness is 542.7 HV on the surface and 567.3 HV in the cross-section.
Executive Standards: The main applicable standards include ASTM A564/A564M and GB/T 1222. In addition, the AMS 6514 standard is also applicable to 18Ni 300 maraging steel, while the Mil-S-46850 standard specifies requirements for its fracture toughness and other properties.
SPECIFICATIONS:
AMS 6512 = C250 maraging
AMS 6514 = C300 maraging
AMS 6515 = C350 maraging
Mil-S-46850 (applies to all grades) – FRACTURE TOUGHNESS APPLIES
Maraging 250 900/925 ºF 6 hrs. 48/52 Rc Maraging 300 900/925 ºF 6 hrs. 50/55 Rc Maraging 350 900/925 ºF 6 hrs. 55/60 Rc Or 950 ºF 3 hrs. 56/60 Rc
EXCELLENT WORKABILITY *high resistance to crack propagation *readily formed – cold, warm, hot (w/o in process anneals) *good weldability w/o preheating or post heating
EXCELLENT HEAT TREATMENT CHARACTERISTICS *low furnace temps required *precipitation hardening, aging heat treatment *uniform, predictable shrinkage during heat treatment *freedom from carburization or decarburization *through hardening w/o quenching *minimal distortion during heat treatment (.0009 in/ in C250 // .001 in/ in C300)
2024 18ni 300 maraging steel market trend
Market Scale: 2024 global market size = 81 million yuan (China: 21 million yuan); 2030 forecast = 109 million yuan (CAGR: 5.07%).
Key Demand Drivers: Aerospace (components like landing gear), high-performance automotive (gears/shafts), energy (nuclear/thermal power) sectors.
Additive Manufacturing Boost: 15% of maraging steel used as powder for 3D printing, driving demand for complex high-strength parts.
Sustainability Shift: 60% of manufacturers adopt low-emission tech; 22% of output from recycled alloys.
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