AISI 4140 Steel, normalized at 870°C (1600°F), air cooled, 50 mm (2 in.) round

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AISI 4140 Steel, normalized at 870°C (1600°F), air cooled, 50 mm (2 in.) round
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	Normalized: heated to 815°C, air cooled. Medium-carbon steel with high hardenability and good fatigue, abrasion and impact resistance.
Key Words:	AFNOR 40 CD 4, AFNOR 42 CD 4 (France), 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	285	285
Hardness, Knoop	311	311	Converted from Brinell
Hardness, Rockwell B	99	99	Converted from Brinell
Hardness, Rockwell C	30	30	Converted from Brinell
Hardness, Vickers	301	301	Converted from Brinell
Tensile Strength, Ultimate	972 MPa	141000 psi
Tensile Strength, Yield	635 MPa	92100 psi
Elongation at Break	16.5 %	16.5 %	in 50 mm
Reduction of Area	48.1 %	48.1 %
Modulus of Elasticity	205 GPa	29700 ksi	Typical for steel
Bulk Modulus	160 GPa	23200 ksi	Typical for steel
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 steel

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	33.0 W/m-K @Temperature 600 °C	229 BTU-in/hr-ft²-°F @Temperature 1110 °F
	37.7 W/m-K @Temperature 400 °C	262 BTU-in/hr-ft²-°F @Temperature 752 °F
	42.2 W/m-K @Temperature 200 °C	293 BTU-in/hr-ft²-°F @Temperature 392 °F
	42.6 W/m-K @Temperature 100 °C	296 BTU-in/hr-ft²-°F @Temperature 212 °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	96.785 - 97.77 %	96.785 - 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 - 0.30 %	0.15 - 0.30 %
Sulfur, S	<= 0.040 %	<= 0.040 %

References for this datasheet.

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M4140D / 7531

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