AISI 4340 Steel, oil quenched 845°C, 425°C (800°F) temper

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AISI 4340 Steel, oil quenched 845°C, 425°C (800°F) temper
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	AISI 4340 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 G43400, AMS 5331, AMS 6359, AMS 6414, AMS 6415, ASTM A322, ASTM A331, ASTM A505, ASTM A519, ASTM A547, ASTM A646, MIL SPEC MIL-S-16974, B.S. 817 M 40 (UK), SAE J404, SAE J412, SAE J770, DIN 1.6565, JIS SNCM 8, IS 1570 40Ni2Cr1Mo28, IS 1570 40NiCr1Mo15
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Physical Properties	Metric	English	Comments

Density	7.85 g/cc	0.284 lb/in³

Mechanical Properties	Metric	English	Comments
Tensile Strength, Ultimate	1595 MPa	231300 psi
	1985 MPa @Temperature -195 °C	287900 psi @Temperature -319 °F
Tensile Strength, Yield	1475 MPa	213900 psi
	1840 MPa @Temperature -195 °C	267000 psi @Temperature -319 °F
Elongation at Break	12 %	12 %
	4.0 % @Temperature -195 °C	4.0 % @Temperature -319 °F
Reduction of Area	46 %	46 %
	11 % @Temperature -195 °C	11 % @Temperature -319 °F
Modulus of Elasticity	212 GPa	30700 ksi
	213 GPa @Temperature -195 °C	30900 ksi @Temperature -319 °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	81.5 GPa	11800 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	12.3 µm/m-°C @Temperature 20.0 °C	6.83 µin/in-°F @Temperature 68.0 °F	specimen oil hardened, 600°C (1110°F) temper
	12.6 µm/m-°C @Temperature 21.0 - 260 °C	7.00 µin/in-°F @Temperature 69.8 - 500 °F	1.88% Ni, normalized and tempered
	12.7 µm/m-°C @Temperature 20.0 °C	7.06 µin/in-°F @Temperature 68.0 °F	specimen oil hardened, 600°C (1110°F) temper
	13.7 µm/m-°C @Temperature 250 °C	7.61 µin/in-°F @Temperature 482 °F	specimen oil hardened, 600°C (1110°F) temper
	13.7 µm/m-°C @Temperature 21.0 - 540 °C	7.61 µin/in-°F @Temperature 69.8 - 1000 °F	1.88% Ni, normalized and tempered
	13.9 µm/m-°C @Temperature 21.0 - 540 °C	7.72 µin/in-°F @Temperature 69.8 - 1000 °F	1.90% Ni, quenched, tempered
	14.5 µm/m-°C @Temperature 500 °C	8.06 µin/in-°F @Temperature 932 °F	specimen oil hardened, 600°C (1110°F) temper
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 - 0.43 %	0.37 - 0.43 %
Chromium, Cr	0.70 - 0.90 %	0.70 - 0.90 %
Iron, Fe	95.195 - 96.33 %	95.195 - 96.33 %	As remainder
Manganese, Mn	0.60 - 0.80 %	0.60 - 0.80 %
Molybdenum, Mo	0.20 - 0.30 %	0.20 - 0.30 %
Nickel, Ni	1.65 - 2.0 %	1.65 - 2.0 %
Phosphorus, P	<= 0.035 %	<= 0.035 %
Silicon, Si	0.15 - 0.30 %	0.15 - 0.30 %
Sulfur, S	<= 0.040 %	<= 0.040 %

References for this datasheet.

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M434AT / 7770

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