AISI Grade 18Ni (300) Maraging Steel nominal annealed properties
Categories: Metal; Ferrous Metal; 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: UNS K93120, ASTM A538 (C), ASTM A579 grade 73, 18Ni300
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Physical PropertiesMetricEnglishComments
Density 8.00 g/cc0.289 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell 304304Converted from Rockwell C hardness.
Hardness, Knoop 326326Converted from Rockwell C hardness.
Hardness, Rockwell C 3232Converted from Brinell
Hardness, Vickers 316316Converted from Rockwell C hardness.
Tensile Strength, Ultimate 1034 MPa150000 psi
Tensile Strength, Yield 758 MPa
@Strain 0.2 %		110000 psi
@Strain 0.2 %
Elongation at Break 18 %18 %Gage length of 4.5 times the square root of the area.
Reduction of Area 72 %72 %
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 9.0 %9.0 %
Iron, Fe 67 %67 %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 0.60 %0.60 %
Zirconium, Zr 0.010 %0.010 %

References for this datasheet.

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