ASME SA789 Stainless steel duplex steel 2205 welded pipe UNS S31803, UNS 32205
2205 is a Duplex Stainless combination of Ferritic & Austenitic. It has higher corrosion resistance than 316 (3% min. Moly vs 2% in 316) Duplex 2205 is highly resistant to stress corrosion & Chloride cracking. Duplex 2205 is cost effective because it has only 5% Nickel. Duplex stainless has high strength, ductility, toughness and weldability.
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Specifications:
UNS S31803
ASME SA-182 (F51), SA-240, SA-798, SA-790, SA-815
ASTM A182 (F51),A240, A276, A479, A789, A790, A815, A928, A988
SAE J405
UNS S32205
ASME SA-182 (F60), SA-240, SA-798, SA-790, SA-815
ASTM A182 (F60), A240, A276, A479, A480, A798, A790, A815, A928, A988
SAE J405
2205 is a duplex (austenitic-ferritic) stainless steel containing about 40 - 50% ferrite in the annealed condition. 2205 has been a practical solution to chloride stress corrosion cracking problems experienced with 304/304L or 316/316L stainless. The high chromium, molybdenum and nitrogen contents provide corrosion resistance superior to 316/316L and 317L stainless in most environments. 2205 is not suggested for operating temperatures above 600°F.
The design strength of 2205 is significantly higher than 316/316L, often permitting lighter wall construction. 2205 has good notch impact toughness down to temperatures below - 40°F.
Features
- High resistance to chloride stress corrosion cracking
- Chloride pitting and crevice corrosion resistance superior to 317L stainless
- Good general corrosion resistance
- High strength
- Good sulfide stress corrosion resistance
- Useful up to 600°F
Applications
- Chemical process vessels, piping, and heat exchangers
- FGD scrubber systems
- Pulp mill digesters, bleach washers, chip presteaming vessels
- Food process equipment
- Oil field piping, heat exchangers
Chemical Composition, %
|
Cr
|
Ni
|
Mo
|
C
|
N
|
| 22.0-23.0 |
4.50-6.50 |
3.00-3.50 |
.030 Max |
0.14-0.20 |
|
Mn
|
Si
|
P
|
S
|
Fe
|
| 2.00 Max |
1.00 Max |
.030 Max |
.020 Max |
Balance |
Chemical Compositions:
| Chemical Composition (%) Duplex Stainless Steel Pipe |
| Alloy |
2205 |
2205 |
| UNS Designation |
S31803 |
S32205 |
| Carbon (C) max. |
0.030 |
0.030 |
| Manganese (Mn) max. |
2.00 |
2.00 |
| Phosphorus (P) max. |
0.030 |
0.030 |
| Sulfur (S) max. |
0.020 |
0.020 |
| Silicon (Si) max. |
1.00 |
1.00 |
| Chromium (Cr) |
21.0 - 23.0 |
22.0 - 23.0 |
| Nickel (Ni) |
4.5 - 6.5 |
4.5 - 6.5 |
| Molybdenum (Mo) |
2.5 - 3.5 |
3.0 - 3.5 |
| Nitrogen (N) |
0.08 - 0.20 |
0.14 - 0.20 |
| Iron (Fe) |
Balance |
Balance |
