4140 HT

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AISI 4140 Steel, normalized at 870°C (1600°F), reheated to 845°C (1550°F), oil quenched, 480°C (900°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 480°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, 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

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Physical Properties

Metric English Comments

Density 7.85 g/cc 0.284 lb/in³

Mechanical Properties


Hardness, Brinell 388 388

Hardness, Knoop 418 418 Converted from Brinell hardness.

Hardness, Rockwell B

101 101 Converted from Brinell hardness.

Hardness, Rockwell C

43 43 Converted from Brinell hardness.

Hardness, Vickers 411 411 Converted from Brinell hardness.

Tensile Strength, Ultimate

1295 MPa 187800 psi

Tensile Strength, Yield

1205 MPa 174800 psi

Elongation at Break 16.0 % 16.0 %

Reduction of Area 52.0 % 52.0 %

Modulus of Elasticity

205 GPa 29700 ksi Typical for steel

Bulk Modulus 140 GPa 20300 ksi Typical for steels.

Poissons Ratio 0.290 0.290 Calculated

Izod Impact 46.0 J 33.9 ft-lb

Machinability 65 % 65 % Based on AISI 1212 as 100% machinability.

Shear Modulus 80.0 GPa 11600 ksi Typical for steels.

Electrical Properties


Electrical Resistivity 0.0000220 ohm-cm 0.0000220 ohm-cm specimen hardened and tempered; 20°C (68°F)

0.0000263 ohm-cm

@Temperature 100 °C

0.0000263 ohm-cm @Temperature 212 °F

specimen hardened and tempered

0.0000326 ohm-cm

@Temperature 200 °C0.0000326 ohm-cm @Temperature 392 °F


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0.0000475 ohm-cm




0.0000646 ohm-cm




Thermal Properties


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


14.6 µm/m-°C @Temperature 20.0 - 600 °C


Specific Heat

Capacity

0.473 J/g-°C @Temperature 150 - 200 °C

0.113 BTU/lb-°F @Temperature 302 - 392 °F





Thermal Conductivity

42.6 W/m-K 296 BTU-in/hr-ft²-°F

Component Elements Properties


Carbon, C 0.380 - 0.430 % 0.380 - 0.430 %

Chromium, Cr 0.800 - 1.10 % 0.800 - 1.10 %

Iron, Fe 96.795 - 97.77 % 96.795 - 97.77 % As remainder

Manganese, Mn 0.750 - 1.00 % 0.750 - 1.00 %

Molybdenum, Mo 0.150 - 0.250 % 0.150 - 0.250 %

Phosphorous, P <= 0.0350 % <= 0.0350 %

Silicon, Si 0.150 - 0.350 % 0.150 - 0.350 %

Sulfur, S <= 0.0400 % <= 0.0400 %

References for this datasheet.

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4140 HT