Sichuan Liaofu Special Steel Company is one of the most experienced manufacturers and suppliers of maraging 350 steel properties 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.
Products Description
Maraging 350 (also known as Vascomax® 350, AMS 6515) is an 18% nickel, cobalt strengthened steel. It is a very high strength material reaching a UTS of 2310 MPA after heat treatment. It is produced by Vacuum Induction Melting (VIM) followed by Vacuum Arc Remelting (VAR).
It can also be readily machined and formed to your specifications. In addition, the aging process of Maraging steel raises the hardness to a level sufficient for many tooling applications.
Maraging steel is used in aircraft, with applications including landing gear, helicopter undercarriages, slat tracks and rocket motor cases - applications which require high strength-to-weight material. Maraging steel offers an unusual combination of high tensile strength and high fracture toughness.
| Element | Content (%) |
|---|---|
| Iron, Fe | 63 |
| Nickel, Ni | Balance |
| Cobalt, Co | 12 |
| Molybdenum, Mo | 4.8 |
| Titanium, Ti | 1.4 |
| Aluminum, Al | 0.1 |
| Manganese, Mn | ≤ 0.10 |
| Silicon, Si | ≤ 0.10 |
| Carbon, C | ≤ 0.030 |
| Sulfur, S | ≤ 0.010 |
| Phosphorous, P | ≤ 0.010 |
| Zirconium, Zr | 0.01 |
| Boron, B | 0.003 |
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
| Standard Organization | Designation/Grade | Country/Region of Origin | Notes/Remarks |
|---|---|---|---|
| UNS | S35000 | USA | Closest equivalent to AISI 300M |
| AISI/SAE | 350 | USA | High-performance maraging steel |
| ASTM | A203 | USA | Used for pressure vessels |
| EN | 1.6350 | Europe | Similar properties to C350 |
| JIS | SCMN 350 | Japan | Minor compositional differences |
Fabrication Properties
Weldability
| Welding Process | Recommended Filler Metal (AWS Classification) | Typical Shielding Gas/Flux | Notes |
|---|---|---|---|
| TIG | ERNiCrMo-3 | Argon | Preheat recommended |
| MIG | ERNiCrMo-3 | Argon/CO2 | Post-weld heat treatment advised |
Maraging 350 Steel is generally weldable using standard processes such as TIG and MIG. However, preheating is often recommended to prevent cracking, and post-weld heat treatment is essential to restore the desired mechanical properties.
FAQ
Q: Can Maraging 350 be welded without losing its 350 ksi strength?
A: No, welding will degrade the heat-affected zone. If you must weld C350 (AMS 6515), you need to use an ERNiCrMo-3 filler, preheat, and immediately perform a full post-weld aging heat treatment. Otherwise, the weld joint will be the weakest point. (Substitution approval must be confirmed by your design engineer.)
Q: How does Maraging 350 differ from C300 and C250?
A: C350 offers the highest ultimate tensile strength (up to 2310 MPa) but the lowest ductility among the three. C250 and C300 offer a better balance of strength and fracture toughness. Choose C350 only if you need absolute maximum strength and weight reduction for aerospace parts.
Q: What is the shrinkage rate for Maraging 350 during aging?
A: It shrinks linearly by approximately 0.001 inches per inch (0.1%) during the aging process. Because it hardens via precipitation (not quenching), distortion is highly predictable and minimal. You should machine your part slightly oversized and finish grind it after aging.
Q: Why is VIM+VAR melting necessary for C350?
A: At 2310 MPa, standard air-melted steel is too brittle. VIM (Vacuum Induction Melting) followed by VAR (Vacuum Arc Remelting) removes harmful gases and inclusions, guaranteeing the high fracture toughness required for critical aerospace applications like rocket motor cases.
Q: Is your Maraging 350 supplied in the annealed condition?
A: Yes. Our base material is supplied in the annealed and descaled condition (approx. 30-35 HRC). It is very machinable at this stage, allowing you to cut complex geometries before the final aging heat treatment.
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