AISI Grade 18Ni (250) Maraging Steel, nominal annealed properties

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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 Properties	Metric	English	Comments

Density	8.00 g/cc	0.289 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	290	290	Converted from Rockwell C hardness.
Hardness, Knoop	311	311	Converted from Rockwell C hardness.
Hardness, Rockwell C	30	30
Hardness, Vickers	301	301	Converted from Rockwell C hardness.
Tensile Strength, Ultimate	965 MPa	140000 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 GPa	27600 ksi
Bulk Modulus	160 GPa	23200 ksi	Typical for steel.
Poissons Ratio	0.30	0.30	Calculated
Shear Modulus	73.0 GPa	10600 ksi	Estimated from elastic modulus

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000174 ohm-cm	0.0000174 ohm-cm	Typical steel

Thermal Properties	Metric	English	Comments
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 Properties	Metric	English	Comments
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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M1825A / 7376

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