AISI 4340 Steel, annealed, 25 mm round

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AISI 4340 Steel, annealed, 25 mm round
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	Annealed: heated to 810°C, furnace cooled 11°C/hr to 355°C, air cooled 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
Hardness, Brinell	217	217
Hardness, Knoop	240	240	Converted from Brinell
Hardness, Rockwell B	95	95	Converted from Brinell
Hardness, Rockwell C	17	17	Converted from Brinell hardness. Value below normal HRC range, for comparison purposes only.
Hardness, Vickers	228	228	Converted from Brinell
Tensile Strength, Ultimate	745 MPa	108000 psi
Tensile Strength, Yield	470 MPa	68200 psi
Elongation at Break	22 %	22 %
Reduction of Area	50 %	50 %
Modulus of Elasticity	192 GPa	27800 ksi
Bulk Modulus	152 GPa	22000 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	74.0 GPa	10700 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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M434AA / 7751

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