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Rulon Bearings

AISI 8720 Steel
Categories: Metal; Ferrous Metal; Alloy Steel; AISI 8000 Series Steel; Low Alloy Steel; Carbon Steel; Low Carbon Steel
Key Words: SAE J770, DIN 1.6543, B.S. 805 A 20, UNS G87200, ASTM A322, ASTM A331, ASTM A505, ASTM A519, SAE J404, SAE J412
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Physical PropertiesMetricEnglishComments
Density 7.85 g/cc0.284 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell 179 - 235179 - 235hot rolled and cold drawn
Hardness, Knoop 229229Converted from Brinell
Hardness, Rockwell B 9393Converted from Brinell
Hardness, Rockwell C 1515Converted from Brinell hardness. Value below normal HRC range, for comparison only.
Hardness, Vickers 217217Converted from Brinell
Modulus of Elasticity 205 GPa29700 ksiTypical for steel
Bulk Modulus 160 GPa23200 ksiTypical for steel.
Poissons Ratio 0.290.29Calculated
Fracture Toughness 33.0 - 49.4 MPa-m½30.0 - 45.0 ksi-in½cracks originating in case; case depth 0.30 to 0.35 in.
 71.4 - 115 MPa-m½65.0 - 105 ksi-in½cracks originating in core
Machinability 65 %65 %hot rolled and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus 80.0 GPa11600 ksiTypical for steel
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity  0.0000300 ohm-cm
@Temperature 50.0 °C		0.0000300 ohm-cm
@Temperature 122 °F		condition of specimen unknown
 0.0000480 ohm-cm
@Temperature 300 °C		0.0000480 ohm-cm
@Temperature 572 °F		condition of specimen unknown
 
Thermal PropertiesMetricEnglishComments
Specific Heat Capacity 0.475 J/g-°C0.114 BTU/lb-°FTypical steel
Thermal Conductivity 46.6 W/m-K323 BTU-in/hr-ft²-°FTypical steel
 
Component Elements PropertiesMetricEnglishComments
Carbon, C 0.18 - 0.23 %0.18 - 0.23 %
Chromium, Cr 0.40 - 0.60 %0.40 - 0.60 %
Iron, Fe 96.895 - 97.97 %96.895 - 97.97 %As remainder
Manganese, Mn 0.70 - 0.90 %0.70 - 0.90 %
Molybdenum, Mo 0.20 - 0.30 %0.20 - 0.30 %
Nickel, Ni 0.40 - 0.70 %0.40 - 0.70 %
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.

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 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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