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ASTM 18Ni Maraging Steel Details

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

 

18Ni Maraging Steel 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.
Category Type Grade Microstructure Designations
Grades Superalloys 18Ni Maraging Steel Martensite USA - ASTM , AMS 6514 -
ASTM A 538 -
Mil-S-46850D -
UNS K93120 -
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 of grade 18Ni Maraging Steel
Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
123 (≥) 648 (≥) 41 34 24 Solution and Aging, Annealing, Ausaging, Q+T,etc 131
Physical properties of grade 18Ni Maraging Steel
Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
878 (≥) 144 (≥) 13 11 23 Solution and Aging, Annealing, Ausaging, Q+T,etc 121
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
483 881 162
18Ni Maraging Steel Range of products
Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L Forging, hot rolling and cold rolling Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar Round Bar, Flat Bar, Square Bar Φ8-1200mm*L Forging, hot rolling and cold rolling, Cast Black, Rough Turning, Shot Blasting,
Coil / Strip Steel Coil /Steel Strip 0.03-16.0x1200mm Cold-Rolled & Hot-Rolled Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes Seamless Pipes/Tubes, Welded Pipes/Tubes OD:6-219mm x WT:0.5-20.0mm Hot extrusion, Cold Drawn, Welded Annealed, Solution and Aging, Q+T, ACID-WASHED
Cross Reference Table(Equivalent Grade)
Grade Standard Country Application
Y1Cr18Ni9 GB China
Improve the machinability, ablation resistance. Suitable for automatic lathe production of bolt and nut
1Cr18Ni9 GB China
High strength after cold forming, but elongation than 1 cr17ni7 slightly worse. Used in architectural decoration parts
Y1Cr18Ni9Se GB China
Improve the machinability, ablation resistance. Suitable for automatic lathe production of rivets, screws
0Cr18Ni9 GB China
Seamless stainless steel tubes for boiler and heat exchanger
00Cr18Ni10N GB China
In 00cr19ni10 adding N, on the basis of the above grades also features, use the same as the 0 cr19ni9n, but better intergranular corrosion resistance
1Cr18Ni12 GB China
Compared with 0 cr19ni9, processing low hardenability. Used for spinning processing, special drawing, cold heading
1Cr18Ni12Mo2Ti GB China
Seamless stainless steel tubes for boiler and heat exchanger
0Cr18Ni12Mo2Ti GB China
Seamless stainless steel tubes for boiler and heat exchanger
0Cr18Ni12Mo2Cu2 GB China
0Cr18Ni12Mo2Cu2 stainless steel corrosion resistance, resistance to corrosion resistance is better than 0Cr17Ni12Mo2. 0Cr18Ni12Mo2Cu2 stainless steel used in the sulphuric acid resistant material.
00Cr18Ni14Mo2Cu2 GB China
00Cr18Ni14Mo2Cu2 0Cr18Ni12Mo2Cu ultra-low carbon steel, stainless steel 00Cr18Ni14Mo2Cu2 stainless steel is better than 0Cr18Ni12Mo2Cu2 resistance to intergranular corrosion.
1Cr18Ni12Mo3Ti GB China
Seamless stainless steel tubes for boiler and heat exchanger
0Cr18Ni12Mo3Ti GB China
Seamless stainless steel tubes for boiler and heat exchanger
0Cr18Ni16Mo5 GB China
Stainless steel bars
1Cr18Ni9Ti GB China
Seamless stainless steel tubes for boiler and heat exchanger
0Cr18Ni10Ti GB China
Seamless stainless steel tubes for boiler and heat exchanger
0Cr18Ni11Nb GB China
Heavy stainless acid resistant and heat resistant steel forgings
0Cr18Ni9Cu3 GB China
Stainless steel bars
0Cr18Ni13Si4 GB China
Seamless stainless steel tubes for boiler and heat exchanger
1Cr18Ni11SiA1Ti GB China
Stainless steel bars
00Cr18Ni5Mo3Si2 GB China
Stainless steel bars

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