Sichuan Liaofu Special Steel Company is one of the most experienced manufacturers and suppliers of maraging steel grades c250 c300 c350 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.
Maraging Steel Grades C250 C300 C350
Maraging Steel Grades C250, C300, C350 (Available in Bar, Plate, and Forged Forms)
Material Composition
Maraging steel is a family of low-carbon, high-nickel alloys strengthened through a unique age-hardening process. Key elements include:
Nickel (18-25%): Provides exceptional toughness and ductility.
Cobalt, Molybdenum, Titanium: Enhance strength and hardness during aging.
Carbon (<0.03%): Minimizes carbide formation for superior dimensional stability.
International Standards
Compliant with:
ASTM A564 (Standard Specification for Maraging Steels)
AMS 6504 (C250), AMS 6505 (C300), AMS 6506 (C350)
Custom certifications (ISO, EN, JIS) available upon request.
After quenching and tempering mechanical property:
|
σb MPa |
|
δ5 % |
Ψ % |
AKv J |
KIC |
HRC |
|
|
≥2255 |
≥2155 |
≥7 |
≥38 |
≥7 |
Actual test |
≥50 |
We also can produce Maraging c300=ams 6514 steel and maraging c250 steel=asm 6512.Please find chemical analyse difference below
| Element | Grade 200 | Grade 250 | Grade 300 | Grade 350 |
|---|---|---|---|---|
| Iron | balance | balance | balance | balance |
| Nickel | 17.0–19.0 | 17.0–19.0 | 18.0–19.0 | 18.0–19.0 |
| Cobalt | 8.0–9.0 | 7.0–8.5 | 8.5–9.5 | 11.5–12.5 |
| Molybdenum | 3.0–3.5 | 4.6–5.2 | 4.6–5.2 | 4.6–5.2 |
| Titanium | 0.15–0.25 | 0.3–0.5 | 0.5–0.8 | 1.3–1.6 |
| Aluminium | 0.05–0.15 | 0.05–0.15 | 0.05–0.15 | 0.05–0.15 |
| Tensile strength, MPa (ksi) | 1,379 (200) | 1,724 (250) | 2,068 (300) | 2,413 (350) |
Maraging steel chemical composition:
|
Grade |
Tensile Strength (ksi) |
Yield Strength (ksi) |
Elongation (%) |
Hardness (HRC) |
Primary Applications |
|
C250 |
250+ |
240+ |
10-12 |
45-47 |
Aerospace components, precision tools |
|
C300 |
300+ |
285+ |
8-10 |
48-50 |
Defense structures, die-casting molds |
|
C350 |
350+ |
330+ |
6-8 |
50-52 |
High-stress fasteners, rocket components |
Manufacturing Excellence
1. Premium Production Process •Vacuum Induction Melting (VIM): Ensures ultra-clean steel with minimal impurities (sulfur <0.001%, phosphorus <0.002%). •Age-Hardening Expertise: Controlled heat treatment in our ISO 9001-certified furnaces to achieve uniform mechanical properties throughout the material.
2. Customization Options •Form & Size: Bars (diameter 10mm-300mm), plates (thickness 5mm-150mm), and forgings (custom shapes). •Heat Treatment States: As-melted, pre-aged, or fully heat-treated to your specifications. •Testing & Certification: Comprehensive reports including mechanical properties, ultrasonic testing (UT), and chemical analysis.
Application
Aerospace & Defense
Aircraft Components: Landing gear, wing fittings, missile casings (C300/C350 for critical load-bearing parts).
Military Equipment: Armor plating, precision-guided weapon systems, and high-pressure hydraulic components.
Industrial Manufacturing
Mold & Die Making: C250/C300 for injection molds, extrusion dies, and stamping tools requiring high wear resistance and dimensional accuracy.
Heavy Machinery: High-stress gears, shafts, and fasteners in mining, oil & gas, and construction equipment.
Advanced Technology
Robotics & Automation: Lightweight robotic arms and precision bearings for high-speed, high-load applications.
Energy Sector: Turbine components, subsea connectors, and hydrogen storage system parts (resistant to hydrogen embrittlement).
FAQ
Q: Can I machine maraging steel in the annealed state, or do I have to grind it after aging?
A: You machine it in the annealed (solution-treated) condition – it's around 30–35 HRC, similar to pre-hardened mold steel. Use carbide tools, positive rake, and don't let it work-harden. After you cut the shape, you age it. The aging treatment only changes dimensions by about 0.05%, so you can hold tight tolerances if you leave a small grinding allowance. We supply both as-melted and pre-aged if you want to skip the solution treatment.
Q: If I weld C300, will the weld zone still reach 300 ksi after aging?
A: Not automatically. The weld filler must match the base chemistry, and you need to re-solution treat the whole part before aging – otherwise the weld zone will be under-aged and weak. For large parts that can't be re-solution treated, we recommend using a lower-strength grade like C250, or designing around welded joints. We've seen too many cracked missile casings from improper weld cycles.
Q: How does the corrosion resistance of C250 compare to 17-4PH in a marine environment?
A: Maraging steel is not stainless. It has 18% nickel but almost no chromium, so it will rust in salt spray unless you coat it. 17-4PH has 15–17% chromium and survives marine air much better. If you need both high strength and corrosion resistance, stick with 17-4PH or a custom coating. We sell maraging for strength and toughness, not for weather resistance.
Q: I need to hold ±0.01mm on a mold cavity after aging. Is that realistic with C300?
A: Yes, if you plan for the shrink. C300 grows about 0.04–0.06% linearly during aging. For a 200mm cavity, that's roughly 0.08–0.12mm total. So you machine undersize by that amount, then age, then finish grind. The dimensional stability is actually one of the reasons mold makers pick maraging over H13 – less distortion than quenching.
Q: Do you sell C350 in small quantities for a prototype, or is there a minimum order?
A: We stock C250 and C300 in common bar sizes, and we can cut a 5kg piece for a trial. C350 is usually made to order because the titanium content is high and it's harder to roll. Minimum for C350 is about 50kg, with 3–4 weeks lead time. If you just need to test a concept, C300 is a good stand-in – it's 90% of the strength and much easier to get.
Q: What's the real advantage of maraging steel over H13 for a die-casting mold?
A: H13 is tougher at high temperatures – it handles 600°C molten aluminum all day. Maraging steel loses its strength above 400°C, so it's not for the die surface. But for the mold base, ejector plates, or cores that need ultra-high strength and don't see much heat, C250 or C300 gives you 250–300 ksi with better dimensional stability. We sell it to shops that make precision inserts for plastic molds or cold-forming dies, not for hot-work surfaces.
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