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Rulon Bearings

AISI 8640H Steel, oil quenched 845°C (1550°F), 650°C (1200°F) temper, round
Categories: Metal; Ferrous Metal; Alloy Steel; AISI 8000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Key Words: B.S. Type 7, UNS H86400, ASTM A304, SAE J1268, DIN 1.6546, UNI 40 NiCrMo 2 KB, ISO 683-12 10, ISO 683/VIII 1, ISO 683/VIII 1a, ISO 683/VIII 1b, ISO R683-8 1a, ISO R683-8 1b
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Physical PropertiesMetricEnglishComments
Density 7.85 g/cc0.284 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell  211
@Diameter 76.2 mm		211
@Diameter 3.00 in
 219
@Diameter 102 mm		219
@Diameter 4.00 in
 221
@Diameter 50.8 mm		221
@Diameter 2.00 in
 280
@Diameter 25.4 mm		280
@Diameter 1.00 in
Hardness, Knoop  234
@Diameter 76.2 mm		234
@Diameter 3.00 in		Converted from Brinell
 242
@Diameter 102 mm		242
@Diameter 4.00 in		Converted from Brinell
 244
@Diameter 50.8 mm		244
@Diameter 2.00 in		Converted from Brinell
 306
@Diameter 25.4 mm		306
@Diameter 1.00 in		Converted from Brinell
Hardness, Rockwell B  94
@Diameter 76.2 mm		94
@Diameter 3.00 in		Converted from Brinell
 95
@Diameter 102 mm		95
@Diameter 4.00 in		Converted from Brinell
 95
@Diameter 50.8 mm		95
@Diameter 2.00 in		Converted from Brinell
 99
@Diameter 25.4 mm		99
@Diameter 1.00 in		Converted from Brinell
Hardness, Rockwell C  16
@Diameter 76.2 mm		16
@Diameter 3.00 in		Converted from Brinell hardness. Value below normal HRC range, for comparison only.
 17
@Diameter 102 mm		17
@Diameter 4.00 in		Converted from Brinell hardness. Value below normal HRC range, for comparison only.
 18
@Diameter 50.8 mm		18
@Diameter 2.00 in		Converted from Brinell hardness. Value below normal HRC range, for comparison only.
 29
@Diameter 25.4 mm		29
@Diameter 1.00 in		Converted from Brinell
Hardness, Vickers  222
@Diameter 76.2 mm		222
@Diameter 3.00 in		Converted from Brinell
 230
@Diameter 102 mm		230
@Diameter 4.00 in		Converted from Brinell
 232
@Diameter 50.8 mm		232
@Diameter 2.00 in		Converted from Brinell
 295
@Diameter 25.4 mm		295
@Diameter 1.00 in		Converted from Brinell
Tensile Strength, Ultimate  772 MPa
@Diameter 102 mm		112000 psi
@Diameter 4.00 in
 793 MPa
@Diameter 76.2 mm		115000 psi
@Diameter 3.00 in
 848 MPa
@Diameter 50.8 mm		123000 psi
@Diameter 2.00 in
 972 MPa
@Diameter 25.4 mm		141000 psi
@Diameter 1.00 in
Tensile Strength, Yield  635 MPa
@Diameter 102 mm		92100 psi
@Diameter 4.00 in
 655 MPa
@Diameter 76.2 mm		95000 psi
@Diameter 3.00 in
 717 MPa
@Diameter 50.8 mm		104000 psi
@Diameter 2.00 in
 827 MPa
@Diameter 25.4 mm		120000 psi
@Diameter 1.00 in
Elongation at Break  16 %
@Diameter 25.4 mm		16 %
@Diameter 1.00 in		in 50 mm
 19 %
@Diameter 50.8 mm		19 %
@Diameter 2.00 in		in 50 mm
 21 %
@Diameter 76.2 mm		21 %
@Diameter 3.00 in		in 50 mm
 22 %
@Diameter 102 mm		22 %
@Diameter 4.00 in		in 50 mm
Modulus of Elasticity 205 GPa29700 ksiTypical for steel
Bulk Modulus 160 GPa23200 ksiTypical for steel.
Poissons Ratio 0.290.29Calculated
Machinability 65 %65 %annealed and cold drawn. Based on AISI 1212 steel = 100%.
Shear Modulus 80.0 GPa11600 ksiTypical for steel.
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.0000234 ohm-cm0.0000234 ohm-cmTypical steel
 
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 0.37 - 0.44 %0.37 - 0.44 %
Chromium, Cr 0.35 - 0.65 %0.35 - 0.65 %
Iron, Fe 96.485 - 97.93 %96.485 - 97.93 %As remainder
Manganese, Mn 0.70 - 1.05 %0.70 - 1.05 %
Molybdenum, Mo 0.15 - 0.25 %0.15 - 0.25 %
Nickel, Ni 0.35 - 0.75 %0.35 - 0.75 %
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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