AISI Grade 18Ni (250) Maraging Steel, nominal annealed properties
Categories: Metal; Ferrous Metal; Alloy Steel; Low Alloy Steel; Carbon Steel; Low Carbon Steel; Maraging Steel
Material Notes: Applications: Bearings, Belleville springs, bolts, cannon recoil springs, rocket motor and missiles cases, couplings, load cells, flexures for guidance mechanisms of missiles, helicopter drive shafts, transmission shafts, fan shafts in commercial jet engines, aircraft wing components and forgings, aluminum die casting dies, cold forming dies, plastic molding dies, cores, pins, punches, and trim knees.
Key Words: maraging steels, UNS K92890, ASTM A538 (B), ASTM A579 grade 72
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Physical PropertiesMetricEnglishComments
Density 8.00 g/cc0.289 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell 290290Converted from Rockwell C hardness.
Hardness, Knoop 311311Converted from Rockwell C hardness.
Hardness, Rockwell C 3030
Hardness, Vickers 301301Converted from Rockwell C hardness.
Tensile Strength, Ultimate 965 MPa140000 psi
Tensile Strength, Yield 655 MPa
@Strain 0.2 %		95000 psi
@Strain 0.2 %		RT
Elongation at Break 17 %17 %in gage length of 4.5 times the square root of area.
Reduction of Area 75 %75 %
Modulus of Elasticity 190 GPa27600 ksi
Bulk Modulus 160 GPa23200 ksiTypical for steel.
Poissons Ratio 0.300.30Calculated
Shear Modulus 73.0 GPa10600 ksiEstimated from elastic modulus
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.0000174 ohm-cm0.0000174 ohm-cmTypical steel
 
Thermal PropertiesMetricEnglishComments
CTE, linear 10.1 µm/m-°C
@Temperature 21.0 - 480 °C		5.61 µin/in-°F
@Temperature 69.8 - 896 °F
Thermal Conductivity  25.3 W/m-K
@Temperature 20.0 °C		176 BTU-in/hr-ft²-°F
@Temperature 68.0 °F
 25.8 W/m-K
@Temperature 50.0 °C		179 BTU-in/hr-ft²-°F
@Temperature 122 °F
 27.0 W/m-K
@Temperature 100 °C		187 BTU-in/hr-ft²-°F
@Temperature 212 °F
 
Component Elements PropertiesMetricEnglishComments
Aluminum, Al 0.10 %0.10 %
Boron, B 0.0030 %0.0030 %
Carbon, C <= 0.030 %<= 0.030 %
Cobalt, Co 7.5 %7.5 %
Iron, Fe 68 %68 %As remainder
Manganese, Mn <= 0.10 %<= 0.10 %
Molybdenum, Mo 4.8 %4.8 %
Nickel, Ni 18.5 %18.5 %
Phosphorus, P <= 0.010 %<= 0.010 %
Silicon, Si <= 0.10 %<= 0.10 %
Sulfur, S <= 0.010 %<= 0.010 %
Titanium, Ti 0.40 %0.40 %
Zirconium, Zr 0.010 %0.010 %

References for this datasheet.

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