Maraging 350 / VASCOMAX® 350 is an 18% nickel, cobalt strengthened steel (C-type) with excellent properties, workability and heat treatment characteristics. Maraging is double vacuum melted by VIM (Vacuum Induction Melt) followed by VAR (Vacuum Arc Remelt). Maraging material is supplied in the annealed and descaled condition. The alloy is very tough, relatively soft (RC 30/35), readily machined or formed. Maraging provides a high value for critical parts in aerospace, structural, component and tooling applications.
Service Steel Aerospace has Maraging 350 / VASCOMAX® 350 available in billet, bar, rod, plate, sheet, and customized forgings
Maraging
MARtensitic - a very hard form of steel crystalline structure.
Subsequent
AGING (precipitation hardening - approx 3-6 hours @ 900ºF yields optimum material characteristics)
ADVANTAGES OF Maraging 350 Steel:
Excellent Mechanical Properties
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high yield and ultimate tensile strengths
high toughness, ductility and impact strengths
high fatigue strength
high compressive strength
hardness and wear resistance sufficient for many tooling applications
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Excellent Workability
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high resistance to crack propagation
readily formed – cold, warm, hot (w/o in process anneals)
good weldability w/o preheating or post heating
excellent polishability
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Advantages During Application
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low coefficient of expansion minimizes heat checking
pitting and corrosion resistance superior to common tool steel
good repair weldability excellent mechanical properties have led to longer tool life
easily reworked and retreated for secondary tool life
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Common Specifications:
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AMS 6515
MIL-S-46850 - Fracture Toughness Applies
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Chemical Composition:
| Symbol | Element | Nominal % |
| C | Carbon | 0.03 max |
| Si | Silicon | 0.10 max |
| Mn | Manganese | 0.10 max |
| Ni | Nickel | 18.50 |
| Co | Cobalt | 12.00 |
| Mo | Molybdenum | 4.80 |
| Ti | Titanium | 1.40 |
| Al | Aluminum | 0.10 |
| Fe | Iron | Balance |
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Physical Properties:
| Property | |
| Density, lb /in3 | .292 |
| Modulus of Elasticity | 29.0 x 10-6 psi |
| Average Co of Thermal Expansion | 6.3 x 10-6 in/in/°F |
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Heat Treatment / Aging:
Maraging alloys are essentially carbon-free, a protective atmosphere is not required during annealing or aging. Material is supplied in the solution annealed condition with a hardness of 30/35 Rc. Typical heat treat time/temperature are listed below. Large cross sections should be aged for longer periods.
| Temperature | Time | Resulting Hardness |
| 900/925 °F | 6 hrs | 55/60 Rc |
| 950 °F | 3 hrs | 56/60 Rc |
NOTE: A modified aging cycle is suggested for die casting applications for increased die life. The following thermal treatments have been used to obtain desirable characteristics for die casters. Following the rough machining of the die, anneal at 1500-1525 ºF for 1 hour per inch of thickness is typical. After finish machining, an aging heat treatment of 980-1000 ºF for 6 hours is typical.
VASCOMAX® is a registered trademark of Allegheny Technologies Incorporated / Allvac.
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