AISI E4340 Steel, quenched 845°C, 425°C (800°F) temper

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AISI E4340 Steel, quenched 845°C, 425°C (800°F) temper
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	AISI E4340 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 G43406, ASTM A304, ASTM A331, ASTM A505, ASTM A519
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Physical Properties	Metric	English	Comments

Density	7.85 g/cc	0.284 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Knoop	451	451	Converted from Rockwell C hardness.
Hardness, Rockwell C	44	44
Hardness, Vickers	434	434	Converted from Rockwell C hardness.
Modulus of Elasticity	200 GPa	29000 ksi	AISI 4340
Bulk Modulus	159 GPa	23100 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	78.0 GPa	11300 ksi	Estimated from elastic modulus
Charpy Impact	12.0 J @Temperature -185 °C	8.85 ft-lb @Temperature -301 °F
	18.0 J @Temperature -130 °C	13.3 ft-lb @Temperature -202 °F
	22.0 J @Temperature -73.0 °C	16.2 ft-lb @Temperature -99.4 °F
	28.0 J @Temperature -18.0 °C	20.7 ft-lb @Temperature -0.400 °F
	34.0 J @Temperature 38.0 °C	25.1 ft-lb @Temperature 100 °F

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 20.0 °C	6.28 µin/in-°F @Temperature 68.0 °F
	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	0.38 - 0.43 %	0.38 - 0.43 %
Chromium, Cr	0.70 - 0.90 %	0.70 - 0.90 %
Iron, Fe	95.175 - 96.27 %	95.175 - 96.27 %	As remainder
Manganese, Mn	0.65 - 0.85 %	0.65 - 0.85 %
Molybdenum, Mo	0.20 - 0.30 %	0.20 - 0.30 %
Nickel, Ni	1.65 - 2.0 %	1.65 - 2.0 %
Phosphorus, P	<= 0.025 %	<= 0.025 %
Silicon, Si	0.15 - 0.30 %	0.15 - 0.30 %
Sulfur, S	<= 0.020 %	<= 0.020 %

References for this datasheet.

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M434DU / 7814

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