ASTM A790 UNS S31803 Pipe
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Duplex Steel UNS S31803 pipes have both ferritic and austenitic alloy properties, which are superior in overall performance to common stainless steel pipes such as 316 and 316L, and are enhanced in resistance to various types of corrosion. These pipes are specifically designed for purposes and applications where corrosion resistance is a must. This grade of pipe is highly machinable in severe environmental conditions and also performs well in aqueous environments. All Duplex UNS S31803 stainless steel pipes are heat treated at specified temperatures and immersion conditions. Although the chemical composition of this grade of pipe is similar to other austenitic grades of stainless steel pipe.
ASTM A790 UNS S31803 Pipe Specifications
| ASTM Specification | ASTM A790 ASME SA790 |
|---|---|
| Applicable Standard | ASTM, ASME, JIS, AISI, AMS, EN, SAE, DIN, NF, TOCT, DS, DTD, GB |
| Size | 4 to 219mm W. T.: 0.5 to 20mm |
| Welded Pipe Size | 5.0 - 1219.2 mm |
| EFW Pipe size | 5.0 - 1219.2 mm |
| Finish | Polished, AP (Annealed & Pickled), BA (Bright & Annealed), MF, NO.1, NO.4, 2B, BA, HL, 8K, Mirror finish, etc |
| Swg & Bwg | 10 Swg., 12 Swg., 14 Swg., 16 Swg., 18 Swg., 20 Swg. |
| Schedule | SCH5, SCH10, SCH10S, SCH20, SCH30, SCH40, SCH40S, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| Length | Single Random, Double Random, Standard & Cut length Pipe |
| Form | Duplex 2205 Pipe are available in form of Round, Square, Hollow, Rectangular, Hydraulic, Coiled, Straight Pipes, "U" Shape, Pan Cake Coils etc. |
| Type | Seamless / ERW/ EFW / Welded / Fabricated / CDW / DOM / CEW Duplex 2205 Pipe |
| Pipe End | Plain End, Beveled End, Treaded Pipe, Screwed ends |
| Application | Dairy Pipe, Oil Pipe, Gas Pipe, Fluid Pipe, Boiler Pipe for Chemical Industry |
UNS S31803 Duplex Stainless Steel Pipe Corrosion Resistance
Grade 2205 stainless steel exhibits excellent corrosion resistance, much higher than that of grade 316. It resists localized corrosion types like intergranular, crevice and pitting. The CPT of this type of stainless steel is around 35°C. This grade is resistant to chloride stress corrosion cracking (SCC) at temperatures of 150°C. Grade 2205 stainless steels are apt replacements to austenitic grades, especially in premature failure environments and marine environments.
UNS S31803 Duplex Steel Pipe Heat Resistance
The high oxidation resistance property of Grade 2205 is marred by its embrittlement above 300°C. This embrittlement can be modified by a full solution annealing treatment. This grade performs well at temperatures below 300°C.
The Duplex Stainless Steel Pipe is used in the following applications:-
- Chemical Processing, Transport and Storage
- Oil and Gas Exploration and Offshore Rigs
- Mil and Gas Refining
- Marine Environments
- Pollution Control Equipment
- Pulp & Paper Manufacturing
- Chemical Process Plant
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