AISI E4340 Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper, 25 mm round

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AISI E4340 Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper, 25 mm round
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	Post oil quenched hardness: 57 HRC - surface, 57 HRC - 1/2 radius, 56 HRC - center. 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	352
Hardness, Knoop	381	Converted from Brinell
Hardness, Rockwell B	99	Converted from Brinell
Hardness, Rockwell C	39	Converted from Brinell
Hardness, Vickers	372	Converted from Brinell
Tensile Strength, Ultimate	1207 MPa
Tensile Strength, Yield	1145 MPa
Elongation at Break	14.2 %	in 50 mm
Reduction of Area	45.9 %
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	12.3 µm/m-°C @Temperature 20.0 °C	specimen oil hardened, 600°C (1110°F) temper
	12.4 µm/m-°C @Temperature 250 °C
	12.7 µm/m-°C @Temperature 20.0 °C	specimen oil hardened, 600°C (1110°F) temper
	13.7 µm/m-°C @Temperature 250 °C	specimen oil hardened, 600°C (1110°F) temper
	13.7 µm/m-°C @Temperature 500 °C
	14.5 µm/m-°C @Temperature 500 °C	specimen oil hardened, 600°C (1110°F) temper
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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M434CT / 7789

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