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Searches: Advanced | Category | Property | Metals | Trade Name | Manufacturer | Recently Viewed Materials 4140
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
Metric English Comments
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
Metric English Comments
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
specimen hardened and tempered
Page 1 of 2AISI 4140 Steel, normalized at 870°C (1600°F), reheated to 845°C (1550°F), oil quen...
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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 0.380 - 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.
Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's disclaimer and terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.
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Page 2 of 2AISI 4140 Steel, normalized at 870°C (1600°F), reheated to 845°C (1550°F), oil quen...
12/10/2010http://www.matweb.com/search/DataSheet.aspx?MatGUID=b7826d8859cc421a9c0df...
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