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Rulon Bearings

AISI 8650H Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper, round
Categories: Metal; Ferrous Metal; Alloy Steel; AISI 8000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes: Post oil quenched hardness 61 HRC surface, 61 HRC half-radius, 61 HRC center.

Applications: torsion bar springs.
Key Words: UNS H86500, ASTM A304, SAE J1268
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Physical PropertiesMetricEnglishComments
Density 7.85 g/cc0.284 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell  285
@Diameter 102 mm		285
@Diameter 4.00 in
 331
@Diameter 50.8 mm		331
@Diameter 2.00 in
 352
@Diameter 25.4 mm		352
@Diameter 1.00 in
 363
@Diameter 12.7 mm		363
@Diameter 0.500 in
Hardness, Knoop  311
@Diameter 102 mm		311
@Diameter 4.00 in		Converted from Brinell
 359
@Diameter 50.8 mm		359
@Diameter 2.00 in		Converted from Brinell
 381
@Diameter 25.4 mm		381
@Diameter 1.00 in		Converted from Brinell
 392
@Diameter 12.7 mm		392
@Diameter 0.500 in		Converted from Brinell
Hardness, Rockwell B  99
@Diameter 25.4 mm		99
@Diameter 1.00 in		Converted from Brinell
 99
@Diameter 50.8 mm		99
@Diameter 2.00 in		Converted from Brinell
 99
@Diameter 102 mm		99
@Diameter 4.00 in		Converted from Brinell
 100
@Diameter 12.7 mm		100
@Diameter 0.500 in		Converted from Brinell
Hardness, Rockwell C  30
@Diameter 102 mm		30
@Diameter 4.00 in		Converted from Brinell
 36
@Diameter 50.8 mm		36
@Diameter 2.00 in		Converted from Brinell
 39
@Diameter 25.4 mm		39
@Diameter 1.00 in		Converted from Brinell
 40
@Diameter 12.7 mm		40
@Diameter 0.500 in		Converted from Brinell
Hardness, Vickers  301
@Diameter 102 mm		301
@Diameter 4.00 in		Converted from Brinell
 350
@Diameter 50.8 mm		350
@Diameter 2.00 in		Converted from Brinell
 372
@Diameter 25.4 mm		372
@Diameter 1.00 in		Converted from Brinell
 384
@Diameter 12.7 mm		384
@Diameter 0.500 in		Converted from Brinell
Tensile Strength, Ultimate  986 MPa
@Diameter 102 mm		143000 psi
@Diameter 4.00 in
 1140 MPa
@Diameter 50.8 mm		165000 psi
@Diameter 2.00 in
 1185 MPa
@Diameter 25.4 mm		171900 psi
@Diameter 1.00 in
 1225 MPa
@Diameter 12.7 mm		177700 psi
@Diameter 0.500 in
Tensile Strength, Yield  779 MPa
@Diameter 102 mm		113000 psi
@Diameter 4.00 in
 1020 MPa
@Diameter 50.8 mm		148000 psi
@Diameter 2.00 in
 1105 MPa
@Diameter 25.4 mm		160300 psi
@Diameter 1.00 in
 1165 MPa
@Diameter 12.7 mm		169000 psi
@Diameter 0.500 in
Elongation at Break  14.5 %
@Diameter 25.4 mm		14.5 %
@Diameter 1.00 in		in 50 mm
 14.6 %
@Diameter 12.7 mm		14.6 %
@Diameter 0.500 in		in 50 mm
 17 %
@Diameter 50.8 mm		17 %
@Diameter 2.00 in		in 50 mm
 18.7 %
@Diameter 102 mm		18.7 %
@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 60 %60 %annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.
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 0.47 - 0.54 %0.47 - 0.54 %
Chromium, Cr 0.35 - 0.65 %0.35 - 0.65 %
Iron, Fe 96.33 - 97.83 %96.33 - 97.83 %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 - 0.35 %0.15 - 0.35 %
Sulfur, S <= 0.045 %<= 0.045 %

References for this datasheet.

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