AISI 9840 Steel, 540°C (1000°F) temper, 25 mm (1 in.) round

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AISI 9840 Steel, 540°C (1000°F) temper, 25 mm (1 in.) round
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 9000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	Quenched, 540°C temper, 525°C nitride for 40 hours with 20-30% ammonia dissociation, hardness of 88 HR15N case hardness at 0.635-0.762 mm nitrided case depth
Key Words:	UNS G98400, AMS 6342 C, ASTM A274, ASTM A322, ASTM A519, SAE J778, DIN 1.6511, UNI 38 NiCrMo 4, B.S. 816 M 40
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Physical Properties	Metric	English	Comments

Density	7.87 g/cc	0.284 lb/in³	field average for steels

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	361	361
Hardness, Knoop	390	390	Converted from Brinell
Hardness, Rockwell B	100	100	Converted from Brinell
Hardness, Rockwell C	35	35	core hardness. Quenched, 540°C temper, 525°C nitride for 40 hours with 20-30% ammonia dissociation
Hardness, Vickers	382	382	Converted from Brinell
Tensile Strength, Ultimate	1240 MPa	180000 psi
Tensile Strength, Yield	1105 MPa	160300 psi
Elongation at Break	15 %	15 %	in 50 mm
Modulus of Elasticity	200 GPa	29000 ksi	Estimated
Bulk Modulus	160 GPa	23200 ksi	Typical for steel.
Poissons Ratio	0.29	0.29	Calculated
Machinability	70 %	70 %	Estimated
Shear Modulus	80.0 GPa	11600 ksi	Typical for steel

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000174 ohm-cm	0.0000174 ohm-cm	Estimated

Thermal Properties	Metric	English	Comments
CTE, linear	11.5 µm/m-°C @Temperature 20.0 °C	6.39 µin/in-°F @Temperature 68.0 °F
	12.2 µm/m-°C @Temperature 250 °C	6.78 µin/in-°F @Temperature 482 °F	Estimated
	13.9 µm/m-°C @Temperature 500 °C	7.72 µin/in-°F @Temperature 932 °F
	14.7 µm/m-°C @Temperature 1000 °C	8.17 µin/in-°F @Temperature 1830 °F
Specific Heat Capacity	0.472 J/g-°C	0.113 BTU/lb-°F	Estimated
Thermal Conductivity	51.9 W/m-K	360 BTU-in/hr-ft²-°F	Typical steel

Component Elements Properties	Metric	English	Comments
Carbon, C	0.38 - 0.43 %	0.38 - 0.43 %
Chromium, Cr	0.70 - 0.90 %	0.70 - 0.90 %
Iron, Fe	95.945 - 97.02 %	95.945 - 97.02 %	As remainder
Manganese, Mn	0.70 - 0.90 %	0.70 - 0.90 %
Molybdenum, Mo	0.20 - 0.30 %	0.20 - 0.30 %
Nickel, Ni	0.85 - 1.15 %	0.85 - 1.15 %
Phosphorus, P	<= 0.035 %	<= 0.035 %
Silicon, Si	0.15 - 0.30 %	0.15 - 0.30 %
Sulfur, S	<= 0.040 %	<= 0.040 %

References for this datasheet.

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M984AA / 8711

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