AISI E4340 H Steel, oil quenched 800°C (1470°F), 595°C (1100°F) temper, 25 mm round

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AISI E4340 H Steel, oil quenched 800°C (1470°F), 595°C (1100°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:	57 HRC surface, 57 HRC 1/2 radius, 56 HRC center 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	331	331
Hardness, Knoop	359	359	Converted from Brinell
Hardness, Rockwell B	99	99	Converted from Brinell
Hardness, Rockwell C	36	36	Converted from Brinell
Hardness, Vickers	350	350	Converted from Brinell
Tensile Strength, Ultimate	1138 MPa	165100 psi
Tensile Strength, Yield	1096 MPa	159000 psi
Elongation at Break	16.5 %	16.5 %	in 50 mm
Reduction of Area	54.1 %	54.1 %
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 -70.0 - 20.0 °C	6.28 µin/in-°F @Temperature -94.0 - 68.0 °F	Austenitized 870°C (1600°F), 545°C (1010°F) temper for 2 hrs.
	12.4 µm/m-°C @Temperature 21.0 - 260 °C	6.89 µin/in-°F @Temperature 69.8 - 500 °F	Austenitized 870°C (1600°F), 545°C (1010°F) temper for 2 hrs.
	13.7 µm/m-°C @Temperature 500 °C	7.61 µin/in-°F @Temperature 932 °F	austenitized at 870°C (1600°F), 545°C (1010°F) temper for 2 hours
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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M434EJ / 7827

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