AISI Grade 18Ni (200) Maraging Steel, solution annealed at 815°C (1500°F) for 1 hour, air cooled, aged at 480°C (900°F) for 3 hours

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AISI Grade 18Ni (200) Maraging Steel, solution annealed at 815°C (1500°F) for 1 hour, air cooled, aged at 480°C (900°F) for 3 hours
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 K92810, ASTM A538 (A), ASTM A579 grade 71
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Physical Properties	Original Value	Comments

Density	8.00 g/cc

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	840 MPa @Temperature 538 °C
	953 MPa @Temperature 510 °C
	1044 MPa @Temperature 482 °C
	1154 MPa @Temperature 427 °C
	1217 MPa @Temperature 316 °C
Tensile Strength, Yield	743 MPa @Strain 0.2 %, Temperature 538 °C
	876 MPa @Strain 0.2 %, Temperature 510 °C
	977 MPa @Strain 0.2 %, Temperature 482 °C
	1059 MPa @Strain 0.2 %, Temperature 427 °C
	1141 MPa @Strain 0.2 %, Temperature 316 °C
Elongation at Break	12.5 % @Temperature 316 °C	in gage length of 4.5 times the square root of the area
	14 % @Temperature 427 °C	in gage length of 4.5 times the square root of the area
	18 % @Temperature 482 °C	in gage length of 4.5 times the square root of the area
	18.5 % @Temperature 510 °C	in gage length of 4.5 times the square root of the area
	24 % @Temperature 538 °C	in gage length of 4.5 times the square root of the area
Reduction of Area	60 % @Temperature 316 °C
	61 % @Temperature 427 °C
	66.3 % @Temperature 482 °C
	69.6 % @Temperature 510 °C
	73.2 % @Temperature 538 °C
Modulus of Elasticity	183 GPa
Bulk Modulus	160 GPa	Typical for steel.
Poissons Ratio	0.30	Calculated
Shear Modulus	70.0 GPa	Estimated from elastic modulus

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000174 ohm-cm	Typical steel

Thermal Properties	Original Value	Comments
CTE, linear	10.1 µm/m-°C @Temperature 21.0 - 480 °C
Thermal Conductivity	25.3 W/m-K @Temperature 20.0 °C
	25.8 W/m-K @Temperature 50.0 °C
	27.0 W/m-K @Temperature 100 °C

Component Elements Properties	Original Value	Comments
Aluminum, Al	0.10 %
Boron, B	0.0030 %
Carbon, C	<= 0.030 %
Cobalt, Co	8.5 %
Iron, Fe	69 %	As remainder
Manganese, Mn	<= 0.10 %
Molybdenum, Mo	3.25 %
Nickel, Ni	18.5 %
Phosphorus, P	<= 0.010 %
Silicon, Si	<= 0.10 %
Sulfur, S	<= 0.010 %
Titanium, Ti	0.20 %
Zirconium, Zr	0.010 %

References for this datasheet.

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M1820H / 7371

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