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18Ni250 Maraging Steel Rod –High-Strength Quality From A Leading Manufacturer
18Ni250 Maraging Steel Rod is a low-carbon, ultra-high-strength alloy designed for superior toughness and durability. With 18% nickel and an aging process that boosts strength to ~1720 MPa, this Round bar is a favorite in aerospace, tooling, and defense—offering precision and reliability in demanding conditions.
Price: Contact Us for a Custom Quote
Want pricing for 18Ni250 Maraging Steel Rod? Reach out at sales for a tailored quote. Our Round bar and hexagonal bar options deliver exceptional value for high-performance needs.
Specifications
Our Steel Rod comes in various configurations:
- Standards: ASTM A579, AMS 6520, UNS K92890
- 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)
- High strength (1720 MPa post-aging)
- Excellent fracture toughness
- Minimal distortion during heat treatment
- Good weldability and machinability
- Superior fatigue resistance
Applications
- Aerospace: Undercarriage shafts, rocket motor cases
- Tooling: Punch rods, extrusion dies
- Defense: Missile components, fasteners
- Automotive: High-strength shafts
- Energy: Turbine rods
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 17.0 - 19.0 |
| Cobalt (Co) | 7.0 - 9.0 |
| Molybdenum (Mo) | 4.6 - 5.2 |
| Titanium (Ti) | 0.3 - 0.6 |
| Iron (Fe) | Balance |
| Carbon (C) | ≤ 0.03 |
| Silicon (Si) | ≤ 0.1 |
Mechanical Properties
| Property | Value (Aged) |
|---|---|
| Tensile Strength | 1650 - 1720 MPa |
| Yield Strength | 1600 - 1680 MPa |
| Elongation | ≥ 8% |
| Hardness (HB) | 480 - 520 |
Chemical Properties
18Ni250 Maraging Steel provides moderate resistance to mild acids and alkalis in non-oxidizing conditions but struggles in highly oxidizing environments like nitric acid due to low chromium content. Its design prioritizes strength over corrosion resistance.
Things to Note (Limitations)
- Weakens above 480°C (900°F)
- Limited corrosion resistance in harsh acids
- Higher cost due to alloying elements
- Requires aging post-welding for optimal strength
Corrosion Data
| Environment | Corrosion Rate (mm/year) | Test Conditions | Factors Affecting Corrosion |
|---|---|---|---|
| Atmospheric (Air) | 0.02 – 0.05 | Ambient, 20-25°C, 50% humidity | Humidity, surface finish |
| Seawater (3.5% NaCl) | 0.1 – 0.25 | 25°C, aerated, annealed condition | Heat treatment, exposure time |
| Sulfuric Acid (10%) | 0.25 – 0.4 | 25°C, de-aerated, aged condition | Concentration, aeration |
| Hydrochloric Acid (1M) | 0.4 – 0.7 | 25°C, de-aerated, welded/aged | Acid strength, aging temperature |
| Phosphoric Acid (0.6M) | 0.2 – 0.35 | 30°C, de-aerated, annealed condition | Temperature, heat treatment |
| Nitric Acid (10%) | 0.7 – 1.1 | 25°C, oxidizing environment | Low Cr content, oxidizing agents |
| Caustic Soda (10%) | 0.05 – 0.1 | 25°C, de-aerated | Temperature, concentration |
Welding and Manufacturing Tips
- Welding: TIG with matching fillers; age at 480°C for 3 hours post-weld.
- Forming: Anneal at 820°C before shaping Round bar or hexagonal bar.
- Machining: Sharp tools, low speeds—pre-aging aids machinability.
Customer Reviews
Frequently Asked Questions
Q: How does 18Ni250 Maraging Steel compare to stainless steel?
A: 18Ni250 Maraging Steel offers superior strength (up to 1720 MPa) and toughness over stainless steel, though it’s less corrosion-resistant—ideal for structural precision rather than rust-proofing.
Q: What’s the best use for Round Bar 18Ni250?
A: Aerospace and tooling—perfect for shafts and dies. Our factory in China supplies Round bar tailored for these high-stakes applications.
Q: Is 18Ni250 Maraging Steel better than titanium?
A: 18Ni250 Steel provides higher strength (1720 MPa vs. 1100 MPa) and easier machining than titanium, but it’s heavier and less corrosion-resistant—great for strength-focused needs.
Q: Can Hexagonal Bar 18Ni250 handle high temperatures?
A: Yes, up to 480°C—beyond that, 18Ni250 Maraging Steel loses strength, so it’s best for moderate heat environments.
Q: How weldable is 18Ni250 Steel Rod?
A: Very weldable with TIG and matching fillers—age post-weld at 480°C to restore 18Ni250 Steel Rod’s full strength.