1. General:

 

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

 

 

2. Chemical Composition

 

C	Si ≤	Mn ≤	P ≤	S≤	Cr	Fe	Ni	Co	Al	Mo	Ti	Zr
≤0.03	0.1	0.1	0.01	0.01	12.0-13.5	63	18.5	12	0.1	4.8	1.4	0.001

 

3. 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.

 

4. Specifications:

 

    1)    Round bar:

 

Diameter: 8mm-2000mm

 

    2)    Plate/Sheet:

 

Thickness: 2mm-200mm

 

    3)    Pipe/Tube:

 

OD: 80mm-3000mm Thickness: 0.3-20mm

 

     4)    Wire:

 

Thickness: 0.3-80mm

 

    5)    Forgings:

 

Weight: 100-10000Kg

 

Note: We can supply any length based on the customer's requirement.

5. Material Melt Method:

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

6. As Shipped Condition:

Maraging is supplied in the annealed and descaled condition. The alloy is very tough, relatively soft (38
Rc Max.), therefore, readily machined and formed.

7. *Bar Tolerances: .250" - .499" .500" - .999" 1.000" – 3.625" 3.626" – 6.000" 6.001" – 8.000" 8.001" – 10.000"
                                                -.000/+.005   -.000/+.010  -.000/+.031        -.000/+.047        -.000/+.063        -.000/+0.078

 

8. Minimum Properties after Aging:
Hardness ……………… 56 Rc       Charpy V-notch ……… 6 ft/lbs. min           Reduction of Area ……. 25%
Elongation ……………. 2.8%          Yield Strength …………. 330 ksi                Fracture Toughness ….. 25

9.Physical Properties:
Density………………………………… .289 lbs./cu. In
Average Coefficient of Thermal Expansion (70 – 900 F) ……………… 5.6 x 10 -6 in/in. F

 

10.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

11. 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.

12.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.

 

13. 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.

14.Standards:
*Mil-S-46850D

 

15. *DMI product is not supplied to the dimensional tolerances of MIL-S-46850D.

 

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