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Rulon Bearings

Ferralium Alloy 255 solution heat treated, hardened at 510°C (950°F) for 4 hours
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  304
@Diameter 12.7 mm		304
@Diameter 0.500 in		Converted from Rockwell C hardness.
 326
@Diameter 6.35 mm		326
@Diameter 0.250 in		Converted from Rockwell C hardness.
Hardness, Knoop  326
@Diameter 12.7 mm		326
@Diameter 0.500 in		Converted from Rockwell C hardness.
 352
@Diameter 6.35 mm		352
@Diameter 0.250 in		Converted from Rockwell C hardness.
Hardness, Rockwell C  32
@Diameter 12.7 mm		32
@Diameter 0.500 in
 35
@Diameter 6.35 mm		35
@Diameter 0.250 in
Hardness, Vickers  316
@Diameter 12.7 mm		316
@Diameter 0.500 in		Converted from Rockwell C hardness.
 340
@Diameter 6.35 mm		340
@Diameter 0.250 in		Converted from Rockwell C hardness.
Tensile Strength, Ultimate  855 MPa
@Diameter 6.35 mm		124000 psi
@Diameter 0.250 in
 876 MPa
@Diameter 12.7 mm		127000 psi
@Diameter 0.500 in
 883 MPa
@Diameter 9.52 mm		128000 psi
@Diameter 0.375 in
 903 MPa
@Diameter 3.17 mm		131000 psi
@Diameter 0.125 in
 910 MPa
@Diameter 4.762 mm		132000 psi
@Diameter 0.1875 in
 938 MPa
@Diameter 19.0 - 25.4 mm		136000 psi
@Diameter 0.750 - 1.00 in
 979 MPa
@Diameter 0.838 - 2.10 mm		142000 psi
@Diameter 0.0330 - 0.0825 in
Tensile Strength, Yield  641 MPa
@Strain 0.2 %,
Diameter 12.7 mm		93000 psi
@Strain 0.2 %,
Diameter 0.500 in
 683 MPa
@Strain 0.2 %,
Diameter 6.35 mm		99100 psi
@Strain 0.2 %,
Diameter 0.250 in
 683 MPa
@Strain 0.2 %,
Diameter 9.52 mm		99100 psi
@Strain 0.2 %,
Diameter 0.375 in
 689 MPa
@Diameter 4.762 mm,
Strain 0.2 %		99900 psi
@Diameter 0.1875 in,
Strain 0.2 %
 703 MPa
@Diameter 3.17 mm,
Strain 0.2 %		102000 psi
@Diameter 0.125 in,
Strain 0.2 %
 717 MPa
@Diameter 19.0 - 25.4 mm,
Strain 0.2 %		104000 psi
@Diameter 0.750 - 1.00 in,
Strain 0.2 %
 772 MPa
@Diameter 0.838 - 2.10 mm,
Strain 0.2 %		112000 psi
@Diameter 0.0330 - 0.0825 in,
Strain 0.2 %
Elongation at Break  22 %
@Diameter 0.838 - 2.10 mm		22 %
@Diameter 0.0330 - 0.0825 in		in 50 mm
 24 %
@Diameter 3.17 mm		24 %
@Diameter 0.125 in		in 50 mm
 24 %
@Diameter 4.762 mm		24 %
@Diameter 0.1875 in		in 50 mm
 26 %
@Diameter 6.35 mm		26 %
@Diameter 0.250 in		in 50 mm
 28 %
@Diameter 19.0 - 25.4 mm		28 %
@Diameter 0.750 - 1.00 in		in 50 mm
 30 %
@Diameter 9.52 mm		30 %
@Diameter 0.375 in		in 50 mm
 31 %
@Diameter 12.7 mm		31 %
@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  11.0 µm/m-°C
@Temperature 20.0 - 93.0 °C		6.11 µin/in-°F
@Temperature 68.0 - 199 °F
 11.7 µm/m-°C
@Temperature 20.0 - 205 °C		6.50 µin/in-°F
@Temperature 68.0 - 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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