Sichuan Liaofu Special Steel Company is one of the most experienced manufacturers and suppliers of aisi grade 18ni 300 maraging steel in China. With over 20 years' experience, our factory offer high quality products made in China with competitive price. Welcome to contact us for wholesale service.
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
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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.
FAQ
Q: What is your minimum order for 18Ni 300 maraging steel, and can I get a small piece to test before committing to a full heat?
A: We can cut from stock for a trial. You don't need to buy a full heat. For bar or plate, a short length or small plate is possible. Tell us the size and quantity, and we'll quote the smallest practical piece. The same mill certificate and heat number apply to the trial piece.
Q: Do you supply 18Ni 300 in the annealed condition for machining, or only in the aged state?
A: We stock it annealed, which is the right condition for machining, drilling, and milling before aging. If you want it pre-aged or fully aged to a specific hardness, we can arrange that through a qualified heat treater. Most customers machine first, then age, so annealed is the standard supply.
Q: After aging, how much does the part shrink, and how should I compensate in my machining?
A: For C300, plan for about 0.1% linear shrinkage. On a 500 mm part, that's roughly 0.5 mm. Leave that as a grinding allowance and finish after aging. The shrinkage is uniform and predictable, so you can hold tight tolerances if you account for it. We can share the mill's reference data if you need to set your offsets.
Q: Can you cut 18Ni 300 to specific lengths or pre-machine blanks to near-net shape?
A: Yes. We cut bars to your length and can also profile plates or pre-machine blanks if you send a drawing. Tolerance depends on the operation. For cut length, we usually hold ±1 mm. For pre-machined blanks, we can discuss your specific tolerances. This saves you material and machining time, especially on expensive maraging steel.
Q: What documents come with the shipment, and can you arrange third-party inspection for export?
A: Each order includes the mill test report with chemistry, hardness, and mechanical properties. We can also arrange ultrasonic testing, PMI, or third-party inspection by SGS or BV. For EU or US customers, we can provide EN 10204 3.1 certificates. Tell us the destination and your customer's requirements, and we'll confirm what's available.
Q: Is there a Chinese equivalent grade for 18Ni 300, and can you supply both with the same properties?
A: The Chinese equivalent is often referred to as 18Ni 300 or by its GB/T 1222 designation, but chemistry and cleanliness can vary between mills. We supply material that meets the AMS 6514 chemistry and properties, regardless of the mill's local name. If your drawing calls for AMS 6514, we provide the certificate to match. If you need a domestic grade for cost reasons, we can discuss the differences.
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