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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 (AL 2003™ alloy), Standard Duplex (AL 2205™ alloy), and Superduplex (AL 255™ Alloy and UNS S32760).
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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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| AL 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 A-240 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 | ||
| AL 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 A-240 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 | ||
| AL 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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