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Rulon Bearings

Ferralium Alloy 255 solution treated at 1120°C, cooled rapidly
Categories: Metal; Ferrous Metal; Heat Resisting; Stainless Steel
Material Notes: Patented, ferritic-austenitic; high mechanical strength, ductility, and hardness with resistance to corrosion and erosion. Excellent resistance to acids and salts. Duplex alloy with nearly equal portions of austenite and ferrite-matrix phases. Applications include pumps, agitators, valves, and piping for handling wet phosphoric acid slurries, marine scrubbers, pumps and seals, and acid handling equipment.
Key Words: UNS S32550
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Physical PropertiesMetricEnglishComments
Density 7.81 g/cc0.282 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell  163
@Diameter 19.0 - 25.4 mm		163
@Diameter 0.750 - 1.00 in		Converted from Rockwell B hardness.
 167
@Diameter 12.7 mm		167
@Diameter 0.500 in		Converted from Rockwell B hardness.
 241
@Diameter 3.17 mm		241
@Diameter 0.125 in		Converted from Rockwell C hardness.
 251
@Diameter 4.762 mm		251
@Diameter 0.1875 in		Converted from Rockwell C hardness.
 251
@Diameter 9.52 mm		251
@Diameter 0.375 in		Converted from Rockwell C hardness.
 256
@Diameter 0.838 - 2.10 mm		256
@Diameter 0.0330 - 0.0825 in		Converted from Rockwell C hardness.
 256
@Diameter 6.35 mm		256
@Diameter 0.250 in		Converted from Rockwell C hardness.
Hardness, Knoop  255
@Diameter 3.17 mm		255
@Diameter 0.125 in		Converted from Rockwell C hardness.
 266
@Diameter 4.762 mm		266
@Diameter 0.1875 in		Converted from Rockwell C hardness.
 266
@Diameter 9.52 mm		266
@Diameter 0.375 in		Converted from Rockwell C hardness.
 271
@Diameter 6.35 mm		271
@Diameter 0.250 in		Converted from Rockwell C hardness.
 271
@Diameter 0.838 - 2.10 mm		271
@Diameter 0.0330 - 0.0825 in		Converted from Rockwell C hardness.
Hardness, Rockwell B  95
@Diameter 19.0 - 25.4 mm		95
@Diameter 0.750 - 1.00 in
 97
@Diameter 12.7 mm		97
@Diameter 0.500 in
Hardness, Rockwell C  21
@Diameter 3.17 mm		21
@Diameter 0.125 in
 23
@Diameter 4.762 mm		23
@Diameter 0.1875 in
 23
@Diameter 9.52 mm		23
@Diameter 0.375 in
 24
@Diameter 6.35 mm		24
@Diameter 0.250 in
 24
@Diameter 0.838 - 2.10 mm		24
@Diameter 0.0330 - 0.0825 in
Hardness, Vickers  220
@Diameter 19.0 - 25.4 mm		220
@Diameter 0.750 - 1.00 in		Converted from Rockwell B hardness.
 233
@Diameter 12.7 mm		233
@Diameter 0.500 in		Converted from Rockwell B hardness.
 247
@Diameter 3.17 mm		247
@Diameter 0.125 in		Converted from Rockwell C hardness.
 258
@Diameter 4.762 mm		258
@Diameter 0.1875 in		Converted from Rockwell C hardness.
 258
@Diameter 9.52 mm		258
@Diameter 0.375 in		Converted from Rockwell C hardness.
 263
@Diameter 6.35 mm		263
@Diameter 0.250 in		Converted from Rockwell C hardness.
 263
@Diameter 0.838 - 2.10 mm		263
@Diameter 0.0330 - 0.0825 in		Converted from Rockwell C hardness.
Tensile Strength, Ultimate  800 MPa
@Diameter 19.0 - 25.4 mm		116000 psi
@Diameter 0.750 - 1.00 in
 834 MPa
@Diameter 12.7 mm		121000 psi
@Diameter 0.500 in
 841 MPa
@Diameter 6.35 mm		122000 psi
@Diameter 0.250 in
 841 MPa
@Diameter 9.52 mm		122000 psi
@Diameter 0.375 in
 855 MPa
@Diameter 3.17 mm		124000 psi
@Diameter 0.125 in
 869 MPa
@Diameter 4.762 mm		126000 psi
@Diameter 0.1875 in
 896 MPa
@Diameter 0.838 - 2.10 mm		130000 psi
@Diameter 0.0330 - 0.0825 in
Tensile Strength, Yield  600 MPa
@Diameter 19.0 - 25.4 mm,
Strain 0.2 %		87000 psi
@Diameter 0.750 - 1.00 in,
Strain 0.2 %
 600 MPa
@Strain 0.2 %,
Diameter 12.7 mm		87000 psi
@Strain 0.2 %,
Diameter 0.500 in
 627 MPa
@Strain 0.2 %,
Diameter 9.52 mm		90900 psi
@Strain 0.2 %,
Diameter 0.375 in
 641 MPa
@Strain 0.2 %,
Diameter 6.35 mm		93000 psi
@Strain 0.2 %,
Diameter 0.250 in
 648 MPa
@Diameter 3.17 mm,
Strain 0.2 %		94000 psi
@Diameter 0.125 in,
Strain 0.2 %
 662 MPa
@Diameter 4.762 mm,
Strain 0.2 %		96000 psi
@Diameter 0.1875 in,
Strain 0.2 %
 683 MPa
@Diameter 0.838 - 2.10 mm,
Strain 0.2 %		99100 psi
@Diameter 0.0330 - 0.0825 in,
Strain 0.2 %
Elongation at Break  25 %
@Diameter 0.838 - 2.10 mm		25 %
@Diameter 0.0330 - 0.0825 in		in 50 mm
 25 %
@Diameter 3.17 mm		25 %
@Diameter 0.125 in		in 50 mm
 25 %
@Diameter 4.762 mm		25 %
@Diameter 0.1875 in		in 50 mm
 27 %
@Diameter 6.35 mm		27 %
@Diameter 0.250 in		in 50 mm
 31 %
@Diameter 9.52 mm		31 %
@Diameter 0.375 in		in 50 mm
 31 %
@Diameter 19.0 - 25.4 mm		31 %
@Diameter 0.750 - 1.00 in		in 50 mm
 34 %
@Diameter 12.7 mm		34 %
@Diameter 0.500 in		in 50 mm
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.0000840 ohm-cm
@Temperature 25.0 °C		0.0000840 ohm-cm
@Temperature 77.0 °F
 
Thermal PropertiesMetricEnglishComments
CTE, linear  10.6 µm/m-°C
@Temperature 22.0 - 95.0 °C		5.89 µin/in-°F
@Temperature 71.6 - 203 °F
 10.8 µm/m-°C
@Temperature 22.0 - 150 °C		6.00 µin/in-°F
@Temperature 71.6 - 302 °F
 11.2 µm/m-°C
@Temperature 22.0 - 205 °C		6.22 µin/in-°F
@Temperature 71.6 - 401 °F
 12.1 µm/m-°C
@Temperature 20.0 - 315 °C		6.72 µin/in-°F
@Temperature 68.0 - 599 °F
 12.4 µm/m-°C
@Temperature 20.0 - 425 °C		6.89 µin/in-°F
@Temperature 68.0 - 797 °F
 13.0 µm/m-°C
@Temperature 20.0 - 540 °C		7.22 µin/in-°F
@Temperature 68.0 - 1000 °F
Specific Heat Capacity 0.480 J/g-°C0.115 BTU/lb-°FTypical value for stainless steel.
Thermal Conductivity 15.1 W/m-K
@Temperature 100 °C		105 BTU-in/hr-ft²-°F
@Temperature 212 °F
 
Component Elements PropertiesMetricEnglishComments
Carbon, C <= 0.040 %<= 0.040 %
Chromium, Cr 26 %26 %
Copper, Cu 1.7 %1.7 %
Iron, Fe 62 %62 %
Manganese, Mn 0.80 %0.80 %
Molybdenum, Mo 3.3 %3.3 %
Nickel, Ni 5.5 %5.5 %
Nitrogen, N 0.17 %0.17 %
Silicon, Si 0.45 %0.45 %

References for this datasheet.

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