AISI 4340H Steel, annealed 810°C (1490°F)

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AISI 4340H Steel, annealed 810°C (1490°F)
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	AISI 4340H has a favorable response to heat treatment (usually oil quenching followed by tempering) and exhibits a good combination of ductility and strength when treated thusly. Uses include piston pins, bearings, ordnance, gears, dies, and pressure vessels.
Key Words:	alloy steels, UNS H43406, ASTM A304, SAE J1268, DIN 1.6565, IS 1570 40Ni2Cr1Mo28, IS 1570 40NiCr1Mo15
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Physical Properties	Metric	English	Comments

Density	7.85 g/cc	0.284 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	217	217
Hardness, Knoop	240	240	Converted from Brinell
Hardness, Rockwell B	95	95	Converted from Brinell
Hardness, Rockwell C	17	17	Converted from Brinell hardness. Value below normal HRC range, for comparison purposes only.
Hardness, Vickers	228	228	Converted from Brinell
Tensile Strength, Ultimate	745 MPa	108000 psi
Tensile Strength, Yield	475 MPa	68900 psi
Elongation at Break	22 %	22 %	in 50 mm
Modulus of Elasticity	192 GPa	27800 ksi	AISI 4340
Bulk Modulus	152 GPa	22000 ksi	Estimated from elastic modulus
Poissons Ratio	0.29	0.29	Typical for steel
Machinability	50 %	50 %	annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus	74.0 GPa	10700 ksi	Estimated from elastic modulus
Izod Impact	52.0 J	38.4 ft-lb

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000248 ohm-cm @Temperature 20.0 °C	0.0000248 ohm-cm @Temperature 68.0 °F
	0.0000298 ohm-cm @Temperature 100 °C	0.0000298 ohm-cm @Temperature 212 °F
	0.0000552 ohm-cm @Temperature 400 °C	0.0000552 ohm-cm @Temperature 752 °F
	0.0000797 ohm-cm @Temperature 600 °C	0.0000797 ohm-cm @Temperature 1110 °F

Thermal Properties	Metric	English	Comments
CTE, linear	11.3 µm/m-°C @Temperature -70.0 - 20.0 °C	6.28 µin/in-°F @Temperature -94.0 - 68.0 °F	Austenitized 870°C (1600°F), 545°C (1010°F) temper for 2 hrs.
	12.4 µm/m-°C @Temperature 250 °C	6.89 µin/in-°F @Temperature 482 °F
	13.7 µm/m-°C @Temperature 500 °C	7.61 µin/in-°F @Temperature 932 °F
Specific Heat Capacity	0.475 J/g-°C	0.114 BTU/lb-°F	Typical 4000 series steel
Thermal Conductivity	44.5 W/m-K	309 BTU-in/hr-ft²-°F	Typical steel

Component Elements Properties	Metric	English	Comments
Carbon, C	0.37 - 0.44 %	0.37 - 0.44 %
Chromium, Cr	0.65 - 0.95 %	0.65 - 0.95 %
Iron, Fe	95.035 - 96.53 %	95.035 - 96.53 %	As remainder
Manganese, Mn	0.55 - 0.90 %	0.55 - 0.90 %
Molybdenum, Mo	0.20 - 0.30 %	0.20 - 0.30 %
Nickel, Ni	1.55 - 2.0 %	1.55 - 2.0 %
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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M434CM / 7782

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