AISI E4340 H Steel, oil quenched 855°C (1570°F), 230°C (450°F) temper for 4 hrs

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AISI E4340 H Steel, oil quenched 855°C (1570°F), 230°C (450°F) temper for 4 hrs
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	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, Knoop	555	555	Converted from Vickers hardness.
	572 @Temperature -78.0 °C	572 @Temperature -108 °F	Converted from Vickers hardness
	666 @Temperature -195 °C	666 @Temperature -319 °F	Converted from Vickers hardness
	851 @Temperature -255 °C	851 @Temperature -427 °F	Converted from Vickers hardness
Hardness, Vickers	531	531
	548 @Temperature -78.0 °C	548 @Temperature -108 °F
	639 @Temperature -195 °C	639 @Temperature -319 °F
	818 @Temperature -255 °C	818 @Temperature -427 °F
Tensile Strength, Ultimate	1855 MPa	269000 psi
	2020 MPa @Temperature -78.0 °C	293000 psi @Temperature -108 °F
	2200 MPa @Temperature -195 °C	319000 psi @Temperature -319 °F
	2290 MPa @Temperature -255 °C	332000 psi @Temperature -427 °F
Tensile Strength, Yield	1550 MPa	225000 psi
	1915 MPa @Temperature -195 °C	277700 psi @Temperature -319 °F
	1935 MPa @Temperature -78.0 °C	280600 psi @Temperature -108 °F
Elongation at Break	12 %	12 %	in 50 mm
	0.60 % @Temperature -255 °C	0.60 % @Temperature -427 °F	in 50 mm
	10 % @Temperature -195 °C	10 % @Temperature -319 °F	in 50 mm
	12 % @Temperature -78.0 °C	12 % @Temperature -108 °F	in 50 mm
Reduction of Area	40 %	40 %
	0.20 % @Temperature -255 °C	0.20 % @Temperature -427 °F
	24 % @Temperature -195 °C	24 % @Temperature -319 °F
	40 % @Temperature -78.0 °C	40 % @Temperature -108 °F
Modulus of Elasticity	196 GPa	28400 ksi
	210 GPa @Temperature -255 °C	30500 ksi @Temperature -427 °F
	211 GPa @Temperature -195 °C	30600 ksi @Temperature -319 °F
	211 GPa @Temperature -78.0 °C	30600 ksi @Temperature -108 °F
Bulk Modulus	160 GPa	23200 ksi	Typical for steel.
Poissons Ratio	0.30	0.30	Calculated
Machinability	50 %	50 %	annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus	75.0 GPa	10900 ksi	Estimated from elastic modulus
	81.0 GPa @Temperature -255 °C	11700 ksi @Temperature -427 °F	Estimated from elastic modulus
	81.0 GPa @Temperature -195 °C	11700 ksi @Temperature -319 °F	Estimated from elastic modulus
	81.0 GPa @Temperature -78.0 °C	11700 ksi @Temperature -108 °F	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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