Missile housings, aircraft-grade forgings, structural components, cannon recoil and Belleville springs, bearings, transmission and fan shafts for commercial jet engines, couplings, hydraulic lines, fasteners, punches, and tooling dies.
Maraging Steel 250Composition detail
Al (aluminum)
0.05
–
0.15
%
C (carbon)
0
–
0.03
%
Co (cobalt)
7
–
8.5
%
Cr (chromium)
0
–
0.25
%
Fe (iron)
66
–
71
%
Mn (manganese)
0
–
0.1
%
Mo (molybdenum)
4.6
–
5.2
%
Ni (nickel)
17
–
19
%
P (phosphorus)
0
–
0.01
%
S (sulfur)
0
–
0.01
%
Si (silicon)
0
–
0.1
%
Ti (titanium)
0.3
–
0.6
%
Maraging Steel 250Physical properties
Density
7.88
–
7.96
g/cm^3
Maraging Steel 250Mechanical properties
Young’s modulus
183
–
192
GPa
Specific stiffness
23.1
–
24.3
MN.m/kg
Yield strength (elastic limit)
1.640
–
1.810
MPa
Tensile strength
1.690
–
1.870
MPa
Specific strength
207
–
229
kN.m/kg
Elongation
5
–
6
% strain
Compressive strength
1.550
–
1.760
MPa
Flexural modulus
183
–
192
GPa
Flexural strength (modulus of rupture)
1.640
–
1.810
MPa
Shear modulus
70
–
77
GPa
Bulk modulus
160
–
169
GPa
Poisson’s ratio
0.31
–
0.323
Shape factor
12
Hardness – Vickers
445
–
480
HV
Elastic stored energy (springs)
7.17e3
–
8.77e3
kJ/m3
Fatigue strength at 10^7 cycles
642
–
816
MPa
Fatigue strength model (stress range) Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles
622
–
842
MPa
Maraging Steel 250Impact & fracture properties
Fracture toughness
120
–
130
MPa.m0.5
Toughness (G)
76.6
–
90.2
kJ/m2
Maraging Steel 250Thermal properties
Melting point
1430
–
1450
°C
Maximum service temperature
460
–
490
°C
Minimum service temperature
-73
–
-53
°C
Thermal conductivity
19.6
–
20.3
W/m.°C
Specific heat capacity
481
–
501
J/kg.°C
Thermal expansion coefficient
9.54
–
10
µstrain/°C
Thermal shock resistance
885
–
999
°C
Thermal distortion resistance
1.98
–
2.1
MW/m
Latent heat of fusion
202
–
283
kJ/kg
Maraging Steel 250Electrical properties
Electrical resistivity
36
–
70
µohm.cm
Electrical conductivity
2.46
–
4.79
%IACS
Galvanic potential
-0.47
–
-0.39
V
Maraging Steel 250Magnetic properties
Magnetic type
Magnetic
Maraging Steel 250Optical, aesthetic and acoustic properties
Transparency
Opaque
Acoustic velocity
4810
–
4930
m/s
Mechanical loss coefficient (tan delta)
7.3e-4
–
0.00153
Maraging Steel 250Processing properties
Metal casting
Unsuitable
Metal cold forming
Excellent
Metal hot forming
Excellent
Metal press forming
Acceptable
Metal deep drawing
Limited use
Machining speed
3.05 m/min
Weldability Notes: Preheating may be required, post weld heat treatment is required
Good
Carbon equivalency
0.59 – 0.708
Maraging Steel 250Durability
Water (fresh)
Acceptable
Water (salt)
Limited use
Weak acids
Limited use
Strong acids
Unacceptable
Weak alkalis
Acceptable
Strong alkalis
Limited use
Organic solvents
Excellent
Oxidation at 500C
Acceptable
UV radiation (sunlight)
Excellent
Galling resistance (adhesive wear)
Acceptable
Flammability
Non-flammable
Maraging Steel 250Corrosion resistance
Stress corrosion cracking Note Rated in chloride; May be susceptible in halide, ammonia, nitrogen, acidic, caustic, carbonate environments
Slightly susceptible
Maraging Steel 250Similar compositions
Germany: 1.6359 to DIN (Aviation Hdbk), X2NiCoMo18-8-5 to DIN (Aviation Hdbk)
India: IS 14652 to IS 14652
USA: 72 to ASTM A579, Grade 19 to ASTM A646-95, UNS K92890, UNS K92890 to UNS, UNS K92940, UNS K92940 to UNS
Tradenames: COX 18, FIRTH-BROWN G110, KRUPP WL 1.6359, LESCALLOY MARVAC 250, M-250, NIMAR 110, NIMARK ALLOY 250, UDIMAR ALLOY 250, UDIMAR B-250, UNIMAR 250, USS MARAGING STEEL GR. 250, VAR STEEL GR. 250, VASCOMAX 250
