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Stainless Steel - Duplex |
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Duplex Stainless Steels have a structure that contains both ferrite and austenite. Duplex alloys have higher strength and better stress corrosion cracking resistance than most austenitic alloys and greater toughness than ferritic alloys, especially at low temperatures. The corrosion resistance of duplex alloys depends primarily on their composition, especially the amount of chromium, molybdenum, and nitrogen they contain. Duplex alloys are often divided into three sub-classes: Lean Duplex (ATI 2102™ duplex, ATI 2003® duplex, and ATI 2304™ duplex alloys), Standard Duplex (ATI 2205™ duplex alloy), and Superduplex (ATI 255™ duplex and UNS S32760 duplex alloys).
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Stainless Steel - Duplex | |
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| Alloy (UNS Designation) |
End Use | Composition nominal wt% |
Specifications | Density lb/in3 (g/cm3) |
Tensile Strength ksi. (MPa) |
0.2% Yield Strength ksi. (MPa) |
Elong- ation % |
Hardness | ||
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| ATI 2102™
S82011 |
Piping and tubing in general corrosion and chloride environments, structural components, storage tanks. | C 0.03 max, Mn 2.0-3.0, Si 1.0 max, Cr 20.5-23.5, Ni 1.0-2.0, Mo 0.10-1.00, N 0.15-0.27, Fe Balance |
ASTM A240, A480, A789, A790 | 0.279 (7.75) |
101 min (sheet) / 95 min (plate) (700 min (sheet) / 655 min (plate)) |
75 min (sheet) / 65 min (plate) (515 min (sheet) / 450 min (plate)) |
30 min | 31 Rockwell C max | ||
| ATI 2003®
S32003 |
Piping, tubing in general corrosion and choride environments, architectural structures, roofing, topside applications on oil platforms | C 0.03 max, Mn 2.0 max, Si 1.0 max, Cr 19.5-22.5, Ni 3.0-4.0, Mo 1.5-2.0, N 0.14-0.2, Fe Balance |
ASTM A240 ASME Code Case 2503 | 0.279 (7.72) |
100 min (sheet) / 95 min (plate) (690min (sheet) / 655 min (plate) |
70 min (sheet) / 65 min (plate) (485 min (sheet) / 450 min (plate) |
25 min | 31 Rockwell C max | ||
| ATI 2304™
S32304 |
Tanks, digesters, pressure vessels, pipes | C 0.03 max, Mn 2.50 max, Si 1.0 max, Cr 21.5-24.5, Ni 3.0-5.5, Mo 0.05-0.60, Cu 0.05-0.60, N 0.05-0.20, Fe Balance |
ASTM A240, ASME SA-240, SAE J405 | 0.280 (7.8) |
87 min (600 min) |
58 min (400 min) |
25 min | 32 Rockwell C max | ||
| ATI 2205™
S31803/S32205 |
Pipe, Tubing in general corrosion and chloride stress corrosion environments | C 0.03 max, Mn 2.0 max, Si 1.0 max, Ni 4.5-6.5, S31803: Cr 21.0-23.0, Mo 2.5-3.5, N 0.08-0.20, S32205: Cr 22.0-23.0, Mo 3.0-3.5, N 0.14-0.20, Fe Balance |
ASTM A240 ASME SA-240 | 0.283 (7.82) |
90 min (31803) / 95 min (32205) (620 min (31803) / 655 min (32205)) |
65 min (450 min) |
25 min | 31 Rockwell C max | ||
| ATI 255™
S32550 |
Pipe, containers for CPI, Oil & Gas | C 0.04 max, Mn 1.5 max, P 0.04 max, S 0.03 max, Si 1.0 max, Cr 24.0-27.0, Ni 4.5-6.5, Mo 2.9-3.9, N 0.1-0.25, Cu 1.5-2.5, Fe Balance |
ASTM A240 | 0.279 (7.73) |
110 min (760 min) |
80 min (550 min) |
15 min | 32 Rockwell C max | ||
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