AISI E4340 Steel, quenched 845°C, 315°C (600°F) temper

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AISI E4340 Steel, quenched 845°C, 315°C (600°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	Original Value	Comments

Density	7.85 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Knoop	506	Converted from Rockwell C hardness.
Hardness, Rockwell C	48
Hardness, Vickers	487	Converted from Rockwell C hardness.
Modulus of Elasticity	200 GPa	AISI 4340
Bulk Modulus	159 GPa	Estimated from elastic modulus
Poissons Ratio	0.29	Typical for steel
Machinability	50 %	annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus	78.0 GPa	Estimated from elastic modulus
Charpy Impact	14.0 J @Temperature -185 °C
	19.0 J @Temperature -130 °C
	20.0 J @Temperature -73.0 °C
	20.0 J @Temperature -18.0 °C
	22.0 J @Temperature 38.0 °C

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000248 ohm-cm @Temperature 20.0 °C
	0.0000298 ohm-cm @Temperature 100 °C
	0.0000552 ohm-cm @Temperature 400 °C
	0.0000797 ohm-cm @Temperature 600 °C

Thermal Properties	Original Value	Comments
CTE, linear	11.3 µm/m-°C @Temperature 20.0 °C
	12.4 µm/m-°C @Temperature 250 °C
	13.7 µm/m-°C @Temperature 500 °C
Specific Heat Capacity	0.475 J/g-°C	Typical 4000 series steel
Thermal Conductivity	44.5 W/m-K	Typical steel

Component Elements Properties	Original Value	Comments
Carbon, C	0.38 - 0.43 %
Chromium, Cr	0.70 - 0.90 %
Iron, Fe	95.175 - 96.27 %	As remainder
Manganese, Mn	0.65 - 0.85 %
Molybdenum, Mo	0.20 - 0.30 %
Nickel, Ni	1.65 - 2.0 %
Phosphorus, P	<= 0.025 %
Silicon, Si	0.15 - 0.30 %
Sulfur, S	<= 0.020 %

References for this datasheet.

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M434DT / 7813

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