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18Ni Maraging Steel chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 18Ni Maraging Steel

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ASTM 18Ni Maraging Steel

Catalog

18Ni Maraging Steel Profile
18Ni Maraging Steel Chemical composition
18Ni Maraging Steel Mechanical Properties
18Ni Maraging Steel Physical Properties
18Ni Maraging Steel Heat treatment
18Ni Maraging Steel Size Availability
18Ni Maraging Steel Relevant products

Profile

This page is mainly introduced the 18Ni Maraging Steel chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of 18Ni Maraging Steel,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
MARAGING (C) 300
General: Maraging is a 18% nickel, cobalt strengthened steel (C-type), with excellent mechanical properties, workability and heat
treatment characteristics.
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 Mn Si P S NI
0.03 max 0.10 max 0.10 max 0.010 max 0.010 max 18.00-19.00
Co Mo Ti Al Cr Cu
8.50-9.50 4.60-5.20 0.50 -0.80 0.05-0.15 0.50 max 0.50 max Fe Bal
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.
*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
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
Physical Properties:
Density………………………………… .289 lbs./cu. In
Average Coefficient of Thermal Expansion (70 – 900 F) ……………… 5.6 x 10 -6 in/in. F
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.
Standards:
AMS 6514 ASTM A 538 *Mil-S-46850D UNS K93120
*DMI product is not supplied to the dimensional tolerances of MIL-S-46850D.
*The information, data and specifications presented here are representative only, and are not guaranteed values. Material or products
applications described are solely for illustrative purposes and should not be construed as express or implied warranties for fitness for these
or other applications

Steel Garde:18Ni Maraging Steel
Type:Superalloys
Country:USA
Standard:ASTM

Standard Number:

ITEM	Standard Number	Descriptions
1	AMS 6514
2	ASTM A 538
3	Mil-S-46850D
4	UNS K93120

Metallographic Structure:Martensite
Application: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.

Relevant products:

X65Cr13 profile steel

Chemical composition(mass fraction)(wt.%)

Elements	Min.（≥）	Max.（≤）
C		0.03
Si		0.10
Mn		0.10
P		0.010
S		0.010
Cr		0.50
Ni	18.00	19.00
Mo	4.60	5.20
Cu		0.50
Co	8.50	9.50
Al	0.05	0.15
Ti	0.50	0.80
Fe		Bal

Mechanical Properties

Tensile strength	337～564	σb/MPa
Yield Strength	595	σ 0.2 ≥/MPa
Elongation	13	δ5≥(％)
ψ	-	ψ≥(％)
Akv	-	Akv≥/J
HBS	964～345	-
HRC	30	-

Physical Properties

Thermal expansion	05-32	e-6/K
Thermal conductivity	49-41	W/m.K
Specific heat	450-460	J/kg.K
Melting temperature	8384-2088	째C
Density	4269-7671	kg/m³
Resistivity	0.50-0.60	Ohm.mm²/m

Heat Treatment Regime

Annealing	Quenching	Tempering	Normalizing	Q & T
√	√	√	√	√

Size Availability

Steel Grade	Specification	Processing range(mm)
18Ni Maraging Steel Superalloys	Round Bar and Hollow Bar	Φ1 to Φ2000
	Square and Flat Steel	Φ10 to Φ100
	Plate and Sheet	0.08-800(Thickness)10-1500(Width)Length
	Tube or Pipe	OD:Φ4-410; WT:1-35 mm; Lenght:10-12000
	Coil and Strip Steel	THK:0.1mm Width:1500mm
	Forged	Ring/Cylindrical/Disk