AISI E4340 Steel, normalized, 50 mm (2 in.) round

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AISI E4340 Steel, normalized, 50 mm (2 in.) round
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	Normalized (heated to 870°C, air cooled), 50 mm round 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, Brinell	341
Hardness, Knoop	369	Converted from Brinell
Hardness, Rockwell B	99	Converted from Brinell
Hardness, Rockwell C	37	Converted from Brinell
Hardness, Vickers	361	Converted from Brinell
Tensile Strength, Ultimate	1220 MPa
Tensile Strength, Yield	786 MPa
Elongation at Break	13.5 %	in 50 mm
Reduction of Area	37.3 %
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

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 -70.0 - 20.0 °C	Austenitized 870°C (1600°F), 545°C (1010°F) temper for 2 hrs.
	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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M434CQ / 7786

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