Maraging Steel 250/C250, 300/C300, 350/C350 Bars and Forgings
- Grade: Maraging Steel 250/C250, 300/C300, 350/C350
- Delivery Condition: Solution Annealed + Aged
- Product Forms: Bars, Forgings, Rings
- Standards: AMS6512, AMS6514, AMS6515, MIL-S-46850
Maraging Steel 250/C250, 300/C300, 350/C350 Bars and Forgings
Maraging Steel 250/C250, 300/C300, and 350/C350 bars and forgings are premium high-strength materials designed for critical applications where exceptional toughness, dimensional stability, and machinability are essential. Known for their outstanding strength-to-weight ratio and excellent resistance to cracking, maraging steels deliver reliable performance after age hardening, making them a preferred choice for aerospace, tooling, defense, motorsport, and other high-performance engineering sectors. Available in multiple grades and forms, these bars and forgings provide a dependable solution for demanding components that require precision, durability, and long service life.
Maraging Steel 250/C250, 300/C300, 350/C350 Bars and Forgings Chemical Compostion and Mechanical Properties
Chemical Composition (wt.%) of Maraging Steel 250 (C250)
| Grade | Ni | Co | Mn | Si | C | Al | Mo | S | P | Ti | Fe | Cr | Cu |
| C250/250 | 17.0 – 19.0 | 7.0 – 8.5 | 0.10 max | 0.10 max | 0.03 max | 0.05 – 0.15 | 4.6 – 5.2 | 0.010 max | 0.010 max | 0.3 – 0.5 | Bal | 0.5 | 0.5 |
Mechanical Properties of Maraging Steel 250 (C250)
| Grade | Condition | Ultimate Tensile Strength (Min) | Yield Strength (Min) | Elongation in 4D % (Min) | Hardness |
| C250/250 | After Maraging Heat Treatment 900°F | 1758 MPa (255 Ksi) | 1724 MPa (250 Ksi) | 6 | ≥ 48 HRC |
Maraging Steel 250 Specifications
UNS K92890, AMS 6512 Bar and Forging Stock, W.Nr. 1.6359, MIL-S-46850, BS S162, DTD 5212, MSRR 6551, MAT 102, MIA 101, Udimar 250, Vascomax C250
Chemical Composition (wt.%) of Maraging Steel 300 (C300)
| Grade | C | Si | Mn | S | P | Co | Ni | Mo | Ti | Al | Fe |
| C300/300 | 0.03 max | 0.10 max | 0.10 max | 0.010 max | 0.010 max | 8.0 – 9.5 | 18.0 – 19.0 | 4.6 – 5.2 | 0.55 – 0.80 | 0.05 – 0.15 | Bal |
Mechanical Properties of Maraging Steel 300 (C300)
| Grade | 0.2% Yield Strength (ksi) | Ultimate Tensile Strength (ksi) | Elongation in 4D (%) | Reduction of Area (%) | Hardness (Rc) |
| C300/300, Solution Annealed 1500°F (816°C), 1hr, AC | 120 | 150 | 16 | 70 | 30 |
| C300/300, Solution Annealed Plus Aged 900°F (482°C), 3 hrs AC | 280 | 290 | 8 | 40 | 52 |
Maraging Steel 300 Specifications
UNS K93120, ASTM A579, AMS 6514 – Bar, SAE AMS 6514 and AMS 6521 (UNS K93160) – Sheet, Strip, Plate, MIL S 46850, MIL S 13881, W. Nr. 1.6358 and 1.6354, Vdimor 300, Vascomax C300
Chemical Composition (wt.%) of Maraging Steel 350 (C350)
| Grade | Ni | Co | Mn | Si | C | B | P | S | Al | Mo | Ti | Zr |
| C350/300 | 18.5 | 12 | 0.10 max | 0.10 max | 0.03 max | 0.003 | 0.01 max | 0.01 max | 0.1 | 4.8 | 1.4 | 0.01 |
Mechanical Properties of Maraging Steel 350 (C350)
| Grade | 0.2% Yield Strength (ksi) | Ultimate Tensile Strength (ksi) | Elongation in 4D (%) |
| C350/350 | 330 | 350 | 8 |
Maraging Steel 350 Specifications
MIL-S-46850, AMS 6515, Maraging 350, Vascomax C350
Features
- AMS 6512 / AMS 6514 / AMS 6515 / MIL-S-46850 Maraging Steel 250 (C250), 300 (C300), 350 (C350) Bars, Forgings, and Rings.
- Ultra-high strength after age-hardening (tensile strength 1758–2413 MPa / 255–350 ksi) with excellent toughness and ductility.
- Low carbon content (<0.03%) for superior weldability and minimal risk of cracking during fabrication.
- Precipitation hardening at low temperature (480–500°C / 900°F) with minimal distortion and outstanding dimensional stability.
- Good machinability in the solution-annealed condition, allowing complex shapes before final aging.
- High fracture toughness and fatigue resistance for critical high-stress components.
- Moderate corrosion resistance, further enhanced by surface treatments or coatings.
- Full traceability with EN 10204 Type 3.1 / 3.2 certification and comprehensive testing (chemical analysis, tensile, hardness, impact).
- Available in solution-annealed + aged condition with wide dimensional range (diameters ¼”–10” / 6.35–254 mm).
Technical Specifications
| Specification | Value |
| Standard | Maraging Steel 250/C250, 300/C300, 350/C350 Bars and Forgings |
| Related Standard | Steel Maraging, Bars, Forgings, Tubing, and Rings 18Ni-7.8Co-4.9Mo-0.40Ti-0.10Al Consumable Electrode Melted, Annealed AMS6512 |
| Steel Maraging, Bars, Forgings, Tubing, and Rings 18.5Ni-9.0Co-4.9Mo-0.65Ti-0.10Al Consumable Electrode Melted, Annealed AMS6514 | |
| Steel, Maraging, Bars, Forgings, Tubing, and Rings 18.5Ni-12.0Co-4.9Mo-1.40Ti-0.10Al Double Vacuum Melted, Annealed AMS6515 | |
| Grade | Maraging Steel 250/C250, 300/C300, 350/C350 |
| Type | Bars, Forgings, Rings |
| Dimension | Diameter: ¼” – 10″ (6.35 – 254mm) |
| Density | 8.02 g/cm³ |
| Inspection Certificate | EN 10204 Type 3.1 (Mill Test Certificate), EN 10204 Type 3.2 (Witness Testing or 3rd Party Inspection) |
| Tests | Chemical Composition, Mechanical Properties |
Applications
- Aerospace rocket motor casings, missile cases, and solid-propellant motor components requiring high strength-to-weight ratio.
- Aircraft landing gear, structural forgings, and high-stress engine parts in defense systems.
- Injection molds, die-casting dies, and extrusion dies for plastic and metal forming tooling.
- High-performance shafts, gears, turbine rotors, and rotating components under extreme loads.
- High-strength fasteners, bolts, springs, and mechanical assemblies in aerospace and industrial machinery.
- Marine and submarine hull components, offshore structures, and pressure vessels needing toughness in demanding environments.
- Precision bars, rings, and forged parts for critical high-reliability engineering applications after proper age-hardening heat treatment.
