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18Ni350 Maraging Steel Rod – High-Strength Quality from a Leading Manufacturer
18Ni350 Maraging Steel Rod is an ultra-high-strength, low-carbon alloy with 18% nickel and cobalt, engineered for exceptional toughness and minimal distortion. Achieving a tensile strength of ~2413 MPa after aging, this Round bar is a standout choice for aerospace, defense, and tooling—delivering precision and durability in the most challenging conditions.
Price: Contact Us for a Custom Quote
Need pricing for 18Ni350 Maraging Steel Rod? Contact us at sales for a custom quote. Our Round bar and hexagonal bar options offer premium value for high-performance applications.
Specifications
Our 18Ni350 Maraging Steel Bar comes in various configurations:
- Standards: AMS 6515, UNS K93160, W.Nr. 1.6355
- Diameter: 0.25″ – 6″ (6.35 mm – 152.4 mm)
- Length: Up to 12 ft (3658 mm), customizable
- Shapes: Round bar, hexagonal bar
- Surface Finish: Annealed, polished, or as-rolled
Key Features (Advantages)
- Exceptional strength (2413 MPa post-aging)
- Superior toughness and ductility
- Minimal shrinkage during heat treatment (~0.05%)
- Great weldability and machinability
- High fatigue resistance
Applications
The 18Ni350 Maraging Steel Bar serves a wide range of industries:
- Aerospace: Rocket shafts, landing gear rods
- Defense: Missile components, fasteners
- Tooling: Punch rods, die supports
- Energy: Turbine shafts
- Motorsports: Performance axles
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 17.0 - 19.0 |
| Cobalt (Co) | 11.5 - 12.5 |
| Molybdenum (Mo) | 4.6 - 5.2 |
| Titanium (Ti) | 1.3 - 1.6 |
| Aluminum (Al) | 0.05 - 0.15 |
| Iron (Fe) | Balance |
| Carbon (C) | ≤ 0.03 |
Mechanical Properties
| Property | Value (Aged) |
|---|---|
| Ultimate Tensile Strength | 2400 - 2500 MPa |
| Yield Strength | 2300 - 2400 MPa |
| Elongation | 6 - 8% |
| Hardness (Rockwell C) | 50 - 54 HRC |
Chemical Properties
18Ni350 Maraging Steel Bar resists mild acids and alkalis in reducing conditions moderately but weakens in oxidizing environments like nitric acid due to low chromium content. It’s built for strength, not corrosion resistance.
Things to Note (Limitations)
- Loses strength above 450°C (842°F)
- Limited corrosion resistance in harsh acids
- Higher cost due to alloying elements
- Needs post-weld aging for full strength
Corrosion Data
| Environment | Exposure Condition | Corrosion Rate (mm/year) | Resistance Level |
|---|---|---|---|
| Atmospheric (Dry, Urban) | 20°C, 50% RH, 1-year exposure | 0.005 – 0.010 | High |
| Atmospheric (Humid, Coastal) | 25°C, 85% RH, 1-year exposure | 0.015 – 0.030 | Moderate |
| Distilled Water | 25°C, immersion, 30 days | 0.002 – 0.005 | High |
| Seawater (3.5% NaCl Solution) | 25°C, immersion, 30 days | 0.050 – 0.100 | Low |
| Dilute Sulfuric Acid (5% H2SO4) | 25°C, immersion, 7 days | 0.200 – 0.300 | Low |
| Dilute Sodium Hydroxide (5% NaOH) | 25°C, immersion, 7 days | 0.010 – 0.020 | Moderate to High |
| Salt Spray (ASTM B117) | 35°C, 5% NaCl, 96-hour exposure | 0.030 – 0.050 | Moderate |
| High-Temperature Oxidation | 400°C, air exposure, 100 hours | 0.001 – 0.003 | High |
Welding and Manufacturing Tips
Welding 18Ni350 Maraging Steel Bar is efficient:
- Welding: TIG with matching fillers; age at 480-500°C for 3-6 hours post-weld.
- Forming: Anneal at 815°C before shaping Round bar or hexagonal bar.
- Machining: Use sharp tools, low speeds—pre-aging boosts machinability.
Customer Reviews
Frequently Asked Questions
Q: What is the difference between 18Ni350 Maraging Steel Bar and other high-strength steels like 4340 or 300M?
A:The 18Ni350 Maraging Steel Bar stands out due to its unique strengthening mechanism. Unlike 4340 or 300M, which rely on carbon for hardness, maraging steel uses intermetallic precipitates formed during aging, resulting in higher toughness and better weldability. Additionally, its low carbon content minimizes distortion during heat treatment, making it ideal for precision components in both round bar and hexagonal bar forms.
Q: What industries benefit most from using the 18Ni350 Maraging Steel Rod?
A:The 18Ni350 Maraging Steel Rod is widely used in industries requiring ultra-high strength and toughness. Aerospace benefits from it in landing gear and missile casings, while defense applications include ordnance components. Tooling industries use it for die-casting dies, and automotive sectors apply it in high-performance racing parts. Its availability as a round bar or hexagonal bar makes it versatile for various machining needs.
Q: Can the 18Ni350 Maraging Steel Bar be used in marine environments?
A:While the 18Ni350 Maraging Steel Rod offers moderate corrosion resistance, it’s not ideal for prolonged exposure to marine environments without protective coatings. In humid or salty conditions, surface treatments like cadmium plating or phosphating are recommended to prevent pitting corrosion, especially for components in round bar or hexagonal bar shapes.
Q: How does the round bar differ from the hexagonal bar version of 18Ni350 Maraging Steel Bar?
The primary difference lies in the shape and application. The round bar version of the 18Ni350 Maraging Steel Bar is ideal for applications requiring cylindrical machining, such as shafts, rods, or structural components in aerospace and automotive industries. The hexagonal bar, on the other hand, is often used for fittings, fasteners, or components where a non-circular cross-section provides better grip or alignment during assembly. Both forms offer the same high strength and toughness but cater to different manufacturing needs.
Q: What heat treatment is recommended for the 18Ni350 Maraging Steel Rod?
For optimal performance, the 18Ni350 Maraging Steel Rod is typically annealed at 820°C for 1 hour per inch of thickness, followed by air cooling. Aging is then performed at 480-500°C for 3-6 hours to achieve peak strength. This process ensures the material reaches its maximum tensile strength while maintaining toughness. Our team can provide tailored heat treatment advice based on whether you’re using the round bar or hexagonal bar format.