AISI 4140 Steel, normalized at 870°C (1600°F), reheated to 845°C (1550°F), oil quenched, 425°C (800°F) temper, 25 mm (1 in.) round

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AISI 4140 Steel, normalized at 870°C (1600°F), reheated to 845°C (1550°F), oil quenched, 425°C (800°F) temper, 25 mm (1 in.) round
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	Sample normalized at 870°C, reheated to 845°C (1550°F), oil quenched, and tempered at 425°C. As quenched hardness after oil quenching: Surface - 55 HRC, 1/2 radius - 55 HRC; Center - 50 HRC
Key Words:	ASTM A322, ASTM A331, ASTM A505, ASTM A519, ASTM A646, B.S. 708 A 42 (UK), B.S. 708 M 40 (UK), B.S. 709 M 40 (UK), JIS SCM 4 H, JIS SCM 4, JIS SCM440, SS14 2244 (Sweden), MIL SPEC MIL-S-16974, SAE J404, SAE J412, SAE J770, DIN 1.7225, UNS G41400, AMS 6381, AMS 6382, AMS 6390, AMS 6395, IS 1570 40Cr1Mo28, IS 4367 40Cr1Mo28, IS 5517 40Cr1Mo28
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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	429	429
Hardness, Knoop	461	461	Converted from Brinell
Hardness, Rockwell B	105	105	Converted from Brinell
Hardness, Rockwell C	46	46	Converted from Brinell
Hardness, Vickers	455	455	Converted from Brinell
Tensile Strength, Ultimate	1450 MPa	210000 psi
Tensile Strength, Yield	1345 MPa	195100 psi
Elongation at Break	15 %	15 %
Reduction of Area	50 %	50 %
Modulus of Elasticity	205 GPa	29700 ksi	Typical for steel
Bulk Modulus	160 GPa	23200 ksi	Typical for steels.
Poissons Ratio	0.29	0.29	Calculated
Machinability	65 %	65 %	Based on AISI 1212 as 100% machinability.
Shear Modulus	80.0 GPa	11600 ksi	Typical for steels.
Izod Impact	28.0 J	20.7 ft-lb

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000220 ohm-cm @Temperature 20.0 °C	0.0000220 ohm-cm @Temperature 68.0 °F	specimen hardened and tempered
	0.0000263 ohm-cm @Temperature 100 °C	0.0000263 ohm-cm @Temperature 212 °F	specimen hardened and tempered
	0.0000326 ohm-cm @Temperature 200 °C	0.0000326 ohm-cm @Temperature 392 °F	specimen hardened and tempered
	0.0000475 ohm-cm @Temperature 400 °C	0.0000475 ohm-cm @Temperature 752 °F	specimen hardened and tempered
	0.0000646 ohm-cm @Temperature 600 °C	0.0000646 ohm-cm @Temperature 1110 °F	specimen hardened and tempered

Thermal Properties	Metric	English	Comments
CTE, linear	12.2 µm/m-°C @Temperature 0.000 - 100 °C	6.78 µin/in-°F @Temperature 32.0 - 212 °F
	13.7 µm/m-°C @Temperature 20.0 - 400 °C	7.61 µin/in-°F @Temperature 68.0 - 752 °F
	14.6 µm/m-°C @Temperature 20.0 - 600 °C	8.11 µin/in-°F @Temperature 68.0 - 1110 °F
Specific Heat Capacity	0.473 J/g-°C @Temperature 150 - 200 °C	0.113 BTU/lb-°F @Temperature 302 - 392 °F
	0.519 J/g-°C @Temperature 350 - 400 °C	0.124 BTU/lb-°F @Temperature 662 - 752 °F
	0.561 J/g-°C @Temperature 550 - 600 °C	0.134 BTU/lb-°F @Temperature 1020 - 1110 °F
Thermal Conductivity	42.6 W/m-K	296 BTU-in/hr-ft²-°F

Component Elements Properties	Metric	English	Comments
Carbon, C	0.38 - 0.43 %	0.38 - 0.43 %
Chromium, Cr	0.80 - 1.1 %	0.80 - 1.1 %
Iron, Fe	96.795 - 97.77 %	96.795 - 97.77 %	As remainder
Manganese, Mn	0.75 - 1.0 %	0.75 - 1.0 %
Molybdenum, Mo	0.15 - 0.25 %	0.15 - 0.25 %
Phosphorus, P	<= 0.035 %	<= 0.035 %
Silicon, Si	0.15 - 0.35 %	0.15 - 0.35 %
Sulfur, S	<= 0.040 %	<= 0.040 %

References for this datasheet.

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M414AA / 7560

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