AISI 4140H Steel, oil quenched 845°C (1550°F), 650°C (1200°F) temper, 50 mm (2 in.) round

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AISI 4140H Steel, oil quenched 845°C (1550°F), 650°C (1200°F) temper, 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:	Post oil quenched hardness: 49 HRC surface, 43 HRC 1/2 radius, 38 HRC center
Key Words:	AFNOR 40 CD 4, AFNOR 42 CD 4, JIS SCM 4 H, JIS SCM440, SS14 2244 (Sweden), B.S. 708 A 42 (UK), B.S. 708 M 40 (UK), B.S. 709 M 40 (UK), UNS H41400, ASTM A304, SAE J1268, DIN 1.7225
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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	241	241
Hardness, Knoop	265	265	Converted from Brinell
Hardness, Rockwell B	97	97	Converted from Brinell
Hardness, Rockwell C	22	22	Converted from Brinell
Hardness, Vickers	254	254	Converted from Brinell
Tensile Strength, Ultimate	841 MPa	122000 psi
Tensile Strength, Yield	675 MPa	97900 psi
Elongation at Break	23.2 %	23.2 %
Reduction of Area	65.8 %	65.8 %
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.

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	0.37 - 0.44 %	0.37 - 0.44 %
Chromium, Cr	0.75 - 1.2 %	0.75 - 1.2 %
Iron, Fe	96.585 - 97.93 %	96.585 - 97.93 %	As remainder
Manganese, Mn	0.65 - 1.1 %	0.65 - 1.1 %
Molybdenum, Mo	0.15 - 0.30 %	0.15 - 0.30 %
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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M414AV / 7581

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