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

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AISI E4340 H 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 E4340H 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:	AISI E4340H; alloy steels, UNS H43406, ASTM A304, SAE J1268, DIN 1.6562
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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	341	341
Hardness, Knoop	369	369	Converted from Brinell
Hardness, Rockwell B	99	99	Converted from Brinell
Hardness, Rockwell C	37	37	Converted from Brinell
Hardness, Vickers	361	361	Converted from Brinell
Tensile Strength, Ultimate	1220 MPa	177000 psi
Tensile Strength, Yield	786 MPa	114000 psi
Elongation at Break	13.5 %	13.5 %	in 50 mm
Reduction of Area	37.3 %	37.3 %
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

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	0.37 - 0.44 %	0.37 - 0.44 %
Chromium, Cr	0.65 - 0.95 %	0.65 - 0.95 %
Iron, Fe	95.015 - 96.48 %	95.015 - 96.48 %	As remainder
Manganese, Mn	0.60 - 0.95 %	0.60 - 0.95 %
Molybdenum, Mo	0.20 - 0.30 %	0.20 - 0.30 %
Nickel, Ni	1.55 - 2.0 %	1.55 - 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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M434EC / 7820

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