Alloy 2205 (UNS S32305/S31803) is a 22% chromium, 3% molybdenum, 5-6% nickel, nitrogen alloyed duplex stainless steel pipe with high general, localized, and stress corrosion resistance properties in addition to high strength and excellent impact toughness.
Alloy 2205 provides pitting and crevice corrosion resistance superior to 316L or 317L austenitic stainless steel tube in almost all corrosive media. It also has high corrosion and erosion fatigue properties as well as lower thermal expansion and higher thermal conductivity than austenitic.
General Properties
Application
Standards
Chemical Composition
Resistance to Corrosion
Physical Properties
Mechanical Properties
Structure
Welding
Processing
Machinability
S31803 Stainless Steel Tube | S32205 Stainless Steel Pipe
304 | 304L | 304H| 316/316L| 316Ti| 317L| 321/321H | 309S | 310S | 347/347H| S32205/S31803| S32750| 904L
Duplex 2205 Product Information
| Products |
OD |
Wall |
Lengths and/or coils |
Grades |
OD |
Wall |
Lengths |
| Welded Austenitic Steel Boiler, Super Heater, Heat-Exchangers & Condenser Tubes
Specifications: ASTM-A789 and ASTM-A790 |
3/16" (4.76 mm) to 4" (101.6 mm) Metric sizes available |
0.020" (0.51 mm) to 0.220" (5.59 mm) |
Random or cut lengths up to 68' (20.7 m)
Coils to 1-1/2" OD |
Duplex 2205 |
<1-1/2" (38.1 mm) ±0.005" (0.13 mm)
1-1/2" (38.1 mm) to 3" (76.2 mm) ±0.010" (0.25 mm)
3-1/2" (88.9 mm) to 4" (101.6 mm) ±0.015" (0.38 mm) |
±10% |
Randoms up to +2" (50.8 mm) Cuts +1/8" (3 mm) -0"
Coils to 80,000' (24,384 m) |
Physical Properties of Duplex 2205 Alloys in the Annealed Condition at -20°F to +100°F
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Tensile Strength |
Yield Strength |
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| Alloy |
UNS Designation |
Spec. |
psi |
MPa |
ksi |
psi |
MPa |
ksi |
Elongation in 2 in. (min.) % |
Grain Size Req. |
Max. Hardness |
Modulus of Elasticity (x106 psi) |
Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6) |
Thermal Conductivity (BTU-in/ ft2-h-°F) |
| Duplex 2205 |
S32205 |
A789, A790 |
95,000 |
655 |
95 |
70,000 |
485 |
70 |
30 |
— |
28 Rc,
30* Rc |
27.5 |
7.6 |
180 |
| Duplex 2205 |
S31803 |
A789, A790 |
90,000 |
620 |
95 |
65,000 |
450 |
70 |
30 |
— |
28 Rc,
30* Rc |
27.5 |
7.6 |
180 |
*OD over 1.0" TS>87, YS>58, no hardness requirement 1.0" OD and under
Composition of Duplex 2205 tubing and pipe
| Grade |
Duplex 2205 |
| UNS Designation |
S31803/S32205* |
| Carbon (C) Max. |
0.030 |
| Manganese (Mn) Max. |
2.00 |
| Phosphorous (P) Max. |
0.030 |
| Sulphur (S) Max. |
0.020 |
| Silicon (Si) Max. |
1.00 |
| Chromium (Cr) |
22.0 – 23.0 |
| Nickel (Ni) |
4.5 – 6.5 |
| Molybdenum (Mo) |
3.0 – 3.5 |
| Nitrogen (N) |
0.14 – 0.20 |
| Iron (Fe) |
Bal. |
| Copper (Cu) |
— |
| Other Elements |
N/A |
* S32205 is the more restrictive chemistry and is shown
Duplex 2205 Product Range
| Alloy |
UNS Designation |
Werkstoff NR. |
Specifications* |
| 2205 |
S31803/S32205 |
1.4462 |
A/SA789, A/SA790 |
*Note: The specifications noted including ASTM, ASME, or other applicable authorities are correct at the time of publication. Other specifications may apply for use of these materials in different applications.
