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ATI Allegheny Ludlum AL 2205™ Duplex Stainless Steel, Plate > 0.1875" Duplex Stainless Steel, UNS S31803

Category Metal , Ferrous Metal , Stainless Steel
Manufacturer ATI Allegheny Ludlum
Trade Name
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF ATI Allegheny Ludlum AL 2205™ Duplex Stainless Steel, Plate > 0.1875" Duplex Stainless Steel, UNS S31803.pdf
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Material Notes:
Ferromagnetic. The AL 2205 alloy is a nitrogen-enhanced duplex stainless steel alloy. The nitrogen serves to significantly improved the corrosion resistance of the alloy; especially in the welded condition. Earlier duplex alloys have had moderate resistance to general corrosion and chloride stress corrosion cracking, but suffered a substantial loss of properties when used in the as-welded condition. To impart the metallurgical benefits of nitrogen to both improved corrosion performance and as-welded properties, the AL 2205 alloy is produced to a .15% minimum nitrogen content compared to the ASTM range of .08-.20%. The minimum Cr, Mo, and Ni contents of AL 2205 alloy are all above the mid range of the ASTM composition specification.When heat-treated properly, the nominal 22% chromium, 5.5% nickel, 3% molybdenum, and 0.16% nitrogen in the AL 2205 alloy produces a microstructure that consists of nearly equal mixture of austenite and ferrite phases. The microstructure and composition of the AL 2205 alloy provides corrosion resistance to many environments that is superior to Types 316, and a yield strength that is more than double that of conventional austenitic stainless steels. The microstructure and phase balance of AL 2205 alloy have been designed to facilitate the production of pipe and tube products. All AL 2205 alloy is metallographically examined to ensure that the as-shipped product is essentially free from the presence of detrimental precipitate phases such as sigma. The AL 2205 is the most widely used of the duplex stainless steels and is often used in the form of welded pipe or tubular components. The alloy has also been applied as a formed and welded sheet product in environments where resistance to general corrosion and chloride stress corrosion cracking is important.Information provided by Allegheny Ludlum
Physical Properties Metric English Comments
Density 7.88 g/cc
0.285 lb/in³
Mechanical Properties Metric English Comments
Hardness, Brinell 235
235
Typical; Annealed Plate
Tensile Strength, Ultimate 760 MPa
110000 psi
Typical; Annealed Plate
Tensile Strength, Yield 515 MPa

@Strain 0.200 %
74700 psi

@Strain 0.200 %
Typical; Annealed Plate
Elongation at Break 35 %
35 %
Typical in 2" (51 mm); Annealed Plate
Modulus of Elasticity 190 GPa
27600 ksi
Thermal Properties Metric English Comments
CTE, linear 13.7 µm/m-°C

@Temperature 20.0 - 100 °C
7.61 µin/in-°F

@Temperature 68.0 - 212 °F
Specific Heat Capacity 0.420 J/g-°C
0.100 BTU/lb-°F
Thermal Conductivity 19.0 W/m-K
132 BTU-in/hr-ft²-°F
Component Elements Properties Metric English Comments
Carbon, C 0.020 %
0.020 %
Chromium, Cr 22.4 %
22.4 %
Iron, Fe 67 %
67 %
as balance
Manganese, Mn 0.70 %
0.70 %
Molybdenum, Mo 3.3 %
3.3 %
Nickel, Ni 5.8 %
5.8 %
Nitrogen, N 0.16 %
0.16 %
Phosphorous, P 0.025 %
0.025 %
Silicon, Si 0.40 %
0.40 %
Sulfur, S 0.0010 %
0.0010 %
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