Ferralium Alloy 255 solution treated at 1120°C, cooled rapidly

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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 Properties	Original Value	Comments

Density	7.81 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Brinell	163 @Diameter 19.0 - 25.4 mm	Converted from Rockwell B hardness.
	167 @Diameter 12.7 mm	Converted from Rockwell B hardness.
	241 @Diameter 3.17 mm	Converted from Rockwell C hardness.
	251 @Diameter 4.762 mm	Converted from Rockwell C hardness.
	251 @Diameter 9.52 mm	Converted from Rockwell C hardness.
	256 @Diameter 0.838 - 2.10 mm	Converted from Rockwell C hardness.
	256 @Diameter 6.35 mm	Converted from Rockwell C hardness.
Hardness, Knoop	255 @Diameter 3.17 mm	Converted from Rockwell C hardness.
	266 @Diameter 4.762 mm	Converted from Rockwell C hardness.
	266 @Diameter 9.52 mm	Converted from Rockwell C hardness.
	271 @Diameter 6.35 mm	Converted from Rockwell C hardness.
	271 @Diameter 0.838 - 2.10 mm	Converted from Rockwell C hardness.
Hardness, Rockwell B	95 @Diameter 19.0 - 25.4 mm
	97 @Diameter 12.7 mm
Hardness, Rockwell C	21 @Diameter 3.17 mm
	23 @Diameter 4.762 mm
	23 @Diameter 9.52 mm
	24 @Diameter 6.35 mm
	24 @Diameter 0.838 - 2.10 mm
Hardness, Vickers	220 @Diameter 19.0 - 25.4 mm	Converted from Rockwell B hardness.
	233 @Diameter 12.7 mm	Converted from Rockwell B hardness.
	247 @Diameter 3.17 mm	Converted from Rockwell C hardness.
	258 @Diameter 4.762 mm	Converted from Rockwell C hardness.
	258 @Diameter 9.52 mm	Converted from Rockwell C hardness.
	263 @Diameter 6.35 mm	Converted from Rockwell C hardness.
	263 @Diameter 0.838 - 2.10 mm	Converted from Rockwell C hardness.
Tensile Strength, Ultimate	800 MPa @Diameter 19.0 - 25.4 mm
	834 MPa @Diameter 12.7 mm
	841 MPa @Diameter 6.35 mm
	841 MPa @Diameter 9.52 mm
	855 MPa @Diameter 3.17 mm
	869 MPa @Diameter 4.762 mm
	896 MPa @Diameter 0.838 - 2.10 mm
Tensile Strength, Yield	600 MPa @Diameter 19.0 - 25.4 mm, Strain 0.2 %
	600 MPa @Strain 0.2 %, Diameter 12.7 mm
	627 MPa @Strain 0.2 %, Diameter 9.52 mm
	641 MPa @Strain 0.2 %, Diameter 6.35 mm
	648 MPa @Diameter 3.17 mm, Strain 0.2 %
	662 MPa @Diameter 4.762 mm, Strain 0.2 %
	683 MPa @Diameter 0.838 - 2.10 mm, Strain 0.2 %
Elongation at Break	25 % @Diameter 0.838 - 2.10 mm	in 50 mm
	25 % @Diameter 3.17 mm	in 50 mm
	25 % @Diameter 4.762 mm	in 50 mm
	27 % @Diameter 6.35 mm	in 50 mm
	31 % @Diameter 9.52 mm	in 50 mm
	31 % @Diameter 19.0 - 25.4 mm	in 50 mm
	34 % @Diameter 12.7 mm	in 50 mm

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000840 ohm-cm @Temperature 25.0 °C

Thermal Properties	Original Value	Comments
CTE, linear	10.6 µm/m-°C @Temperature 22.0 - 95.0 °C
	10.8 µm/m-°C @Temperature 22.0 - 150 °C
	11.2 µm/m-°C @Temperature 22.0 - 205 °C
	12.1 µm/m-°C @Temperature 20.0 - 315 °C
	12.4 µm/m-°C @Temperature 20.0 - 425 °C
	13.0 µm/m-°C @Temperature 20.0 - 540 °C
Specific Heat Capacity	0.480 J/g-°C	Typical value for stainless steel.
Thermal Conductivity	15.1 W/m-K @Temperature 100 °C

Component Elements Properties	Original Value	Comments
Carbon, C	<= 0.040 %
Chromium, Cr	26 %
Copper, Cu	1.7 %
Iron, Fe	62 %
Manganese, Mn	0.80 %
Molybdenum, Mo	3.3 %
Nickel, Ni	5.5 %
Nitrogen, N	0.17 %
Silicon, Si	0.45 %

References for this datasheet.

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