MARAGING (C) 300

MARAGING (C) 300 | AMS 6514 | ASTM A 538 | UNS K93120 | ASTM A579 | SAE AMS 6514 | MIL S 46850

General

Maraging is a 18% nickel, cobalt strengthened steel (C-type), with excellent mechanical properties, workability and heat treatment characteristics.

Introduction

Alloy steels comprise a wide variety of steels with compositions that exceed the limitations of Si, Va, Cr, Ni, Mo, Mn, B and C allocated for carbon steels. In comparison with carbon steels, alloy steels are more responsive to mechanical and heat treatments.
Alloy steels can be used in specific melting and deoxidization processes for particular applications. These steels have elements such as chromium, cobalt, nickel, etc.
Maraging 300 alloy steel is a very high strength iron base, molybdenum, cobalt and nickel alloy. The following datasheet provides an overview of maraging 300 alloy steel.

Applications

Typical applications for maraging include missile and rocket motor cases, landing and takeoff gear, munitions, aerospace, extrusion tooling, die casting, high performance shafting, gears and fasteners.

Composition

  • C : 0.03 max
  • Mn : 0.10 max
  • Si : 0.10 max
  • P : 0.10 max
  • S : 0.10 max
  • NI : 18.00-19.00
  • Co : 8.50-9.50
  • Mo : 4.60-5.20
  • Ti : 0.50 -0.80
  • Al : 0.05-0.15
  • Cr : 0.50 max
  • Cu :  0.50 max

Material Melt Method  Maraging melt method is a VIM (Vacuum Induction Melt) + VAR (Vacuum Arc Remelt)

As Shipped Condition  Maraging is supplied in the annealed and descaled condition. The alloy is very tough, relatively soft (36 Rc Max.), therefore, readily machined and formed.

Physical Properties

 The following table shows the physical properties of maraging 300 alloy steel.

Properties Metric Imperial
Density 8.00 g/cm3 0.289 lb/in³
Melting point 1412.8 °C 2575°F

Minimum Properties after Aging

  • Hardness ……………… 52 Rc
  • Charpy V-notch ……… 12 ft/lbs. min
  • Reduction of Area ……. 47%
  • Elongation ……………. 5.0%
  • Yield Strength …………. 280 ksi
  • Fracture Toughness ….. 60

Heat Treatment Aging Process  (Non Die Casting Applications) Material is to be heat treated to 900 F +/- 10 holding at temperature for 6 hours then cooling at room air temperature. During the aging treatment maraging shrinks uniformly and predictably on all dimensions .001 in/in

Heat Treatment Aging Process (Die Casting Applications) Following the rough machining of the die, anneal at 1500-1525 F for 1 hour per inch of thickness is recommended. After finish machining , an aging heat treatment of 980-1000 F for 6 hours is recommended.

Machining

Maraging steel in the annealed condition is comparable to 4340. However, when maraging is aged, the type of cutting tool and speeds change. Rigid equipment, firm tool supports, sharp tools and abundant coolant are essential.

Welding

Maraging is weld able without preheat, in both the annealed and aged condition. Only an aging heat treatment is needed to restore in the weld.

Specifications

  • AMS 6514
  • ASTM A 538
  • UNS K93120
  • ASTM A579
  • SAE AMS 6514 and AMS 6521 (UNS K93160) – Sheet, Strip, Plate
  • MIL S 46850, MIL S 13881
  • Werkstoff Nr. 1.6358 and 1.6354
  • Vascomax C300
  • Vdimor 300

 

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