AISI 4340 Steel, oil quenched 855°C (1570°F), 230°C (450°F) temper for 4 hrs.

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AISI 4340 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 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	Original Value	Comments

Density	7.85 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Knoop	555	Converted from Vickers hardness.
	572 @Temperature -78.0 °C	Converted from Vickers hardness
	666 @Temperature -195 °C	Converted from Vickers hardness
	851 @Temperature -255 °C	Converted from Vickers hardness
Hardness, Vickers	531
	548 @Temperature -78.0 °C
	639 @Temperature -195 °C
	818 @Temperature -255 °C
Tensile Strength, Ultimate	1855 MPa
	2020 MPa @Temperature -78.0 °C
	2200 MPa @Temperature -195 °C
	2290 MPa @Temperature -255 °C
Tensile Strength, Yield	1550 MPa
	1915 MPa @Temperature -195 °C
	1935 MPa @Temperature -78.0 °C
Elongation at Break	12 %
	0.60 % @Temperature -255 °C
	10 % @Temperature -195 °C
	12 % @Temperature -78.0 °C
Reduction of Area	40 %
	0.60 % @Temperature -255 °C
	24 % @Temperature -195 °C
	40 % @Temperature -78.0 °C
Modulus of Elasticity	196 GPa
	210 GPa @Temperature -255 °C
	211 GPa @Temperature -78.0 °C
	211 GPa @Temperature -195 °C
Bulk Modulus	160 GPa	Typical for steel.
Poissons Ratio	0.30	Calculated
Machinability	50 %	annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus	75.0 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
	12.6 µm/m-°C @Temperature 21.0 - 260 °C	1.88% Ni, normalized and tempered
	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 21.0 - 540 °C	1.88% Ni, normalized and tempered
	13.9 µm/m-°C @Temperature 21.0 - 540 °C	1.90% Ni, quenched, tempered
	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	0.37 - 0.43 %
Chromium, Cr	0.70 - 0.90 %
Iron, Fe	95.195 - 96.33 %	As remainder
Manganese, Mn	0.60 - 0.80 %
Molybdenum, Mo	0.20 - 0.30 %
Nickel, Ni	1.65 - 2.0 %
Phosphorus, P	<= 0.035 %
Silicon, Si	0.15 - 0.30 %
Sulfur, S	<= 0.040 %

References for this datasheet.

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M434AV / 7772

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