Ferralium Alloy 255 solution heat treated, hardened at 510°C (950°F) for 4 hours

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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 Properties	Original Value	Comments

Density	7.81 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Brinell	304 @Diameter 12.7 mm	Converted from Rockwell C hardness.
	326 @Diameter 6.35 mm	Converted from Rockwell C hardness.
Hardness, Knoop	326 @Diameter 12.7 mm	Converted from Rockwell C hardness.
	352 @Diameter 6.35 mm	Converted from Rockwell C hardness.
Hardness, Rockwell C	32 @Diameter 12.7 mm
	35 @Diameter 6.35 mm
Hardness, Vickers	316 @Diameter 12.7 mm	Converted from Rockwell C hardness.
	340 @Diameter 6.35 mm	Converted from Rockwell C hardness.
Tensile Strength, Ultimate	855 MPa @Diameter 6.35 mm
	876 MPa @Diameter 12.7 mm
	883 MPa @Diameter 9.52 mm
	903 MPa @Diameter 3.17 mm
	910 MPa @Diameter 4.762 mm
	938 MPa @Diameter 19.0 - 25.4 mm
	979 MPa @Diameter 0.838 - 2.10 mm
Tensile Strength, Yield	641 MPa @Strain 0.2 %, Diameter 12.7 mm
	683 MPa @Strain 0.2 %, Diameter 6.35 mm
	683 MPa @Strain 0.2 %, Diameter 9.52 mm
	689 MPa @Diameter 4.762 mm, Strain 0.2 %
	703 MPa @Diameter 3.17 mm, Strain 0.2 %
	717 MPa @Diameter 19.0 - 25.4 mm, Strain 0.2 %
	772 MPa @Diameter 0.838 - 2.10 mm, Strain 0.2 %
Elongation at Break	22 % @Diameter 0.838 - 2.10 mm	in 50 mm
	24 % @Diameter 3.17 mm	in 50 mm
	24 % @Diameter 4.762 mm	in 50 mm
	26 % @Diameter 6.35 mm	in 50 mm
	28 % @Diameter 19.0 - 25.4 mm	in 50 mm
	30 % @Diameter 9.52 mm	in 50 mm
	31 % @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	11.0 µm/m-°C @Temperature 20.0 - 93.0 °C
	11.7 µm/m-°C @Temperature 20.0 - 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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MQN255H / 13875

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