Duplex pipe fittings are components used to connect, control, or change the direction of duplex stainless steel pipes in a piping system. Duplex stainless steel is a type of steel that combines features of both austenitic and ferritic stainless steels, offering excellent corrosion resistance, high strength, and good weldability. These fittings are specifically designed to match the properties of duplex stainless steel and are widely used in industries requiring resistance to harsh environments and high pressures.
Here are some key aspects of duplex pipe fittings :
Duplex pipe fittings are made from duplex stainless steel, typically grades such as UNS S31803 (2205) or UNS S32205, which contain a balanced mixture of chromium, molybdenum, nitrogen, and sometimes other elements like nickel and nitrogen for enhanced properties.
Similar to fittings made from other materials, duplex pipe fittings come in various types, including elbows, tees, reducers, couplings, caps, crosses, olets, and more, designed to facilitate different connections and directional changes within a piping system.
These fittings offer high strength and excellent mechanical properties, allowing them to withstand high pressures and temperatures while maintaining structural integrity.
Duplex pipe fittings may come with different types of end connections, such as butt-weld ends, socket-weld ends, or threaded ends, enabling secure attachment to the duplex stainless steel pipes in the system.
Available in various sizes and dimensions to match different pipe diameters and wall thicknesses, conforming to industry standards and specific project requirements.
Duplex stainless steel fittings provide superior resistance to various forms of corrosion, including stress corrosion cracking, pitting, and crevice corrosion, making them suitable for harsh environments, such as those found in chemical processing, oil and gas, marine applications, and desalination plants.
Grade UNS S31803 is termed as a duplex class due to its mixed Austenitic-ferritic microstructure. Duplex stainless steel alloys have an equal proportion of both austenite and ferrite, which is why Duplex Steel Fittings exhibit properties prominent to both classes. Duplex Steel Buttweld Fittings demonstrate better localized corrosion resistance in comparison to both grade 316L and 317L. Hence these duplex steel fittings are used in applications involving several key industrial fields such as chemical plants, seawater pump, seawater desalination plant, and so on. Werkstoff No 1.4462 Duplex Steel Pipe Fittings have a high resistance to intergranular corrosion, especially in chloride and sulphide containing environments. Usually, a regular steels grade would be susceptible to getting degraded in these conditions, unlike Duplex Stainless Steel Fittings, which exhibit very high resistance to stress related corrosion cracking.
UNS S31803 Duplex Steel Elbow fittings in most cases, tend to be tougher when compared to ferritic stainless steel. Whereas the mechanical strengths of duplex stainless steel fittings can in some cases for e.g. UNS S31803 could be as much as two times more than that of conventional austenitic stainless steels. The high chromium content present in the alloy is what protects the Duplex Steel Forged Fittings against corrosion, generally causes embrittlement at temperatures exceeding 300°C.
| Standard Specification : | Duplex Steel Fittings |
| Coating Fitting Faces : | Cold and Hot Dip Galvanized, Yellow Transparent, Oil Black Paint, Zinc Plated, Anti-rust Paint |
| Dimensions Class: | 2000#, 3000#, 6000#, 9000# |
| Application: | Nuclear Power Plant Water Pipeline Industry Chemical Industry Oil And Gas Industry Fabrication Industry Natural Gas Industry |
| Rating Pressure: | Pressure Rating Of: 3000 LBS, 6000 LBS, 9000 LBS |
| Check Sizes: | (SMLS UPTO 24”) 1/2” TO 36” (Buttweld 8” TO 36” ) |
| Fitting Machining Equipment: | Press machine, electric bevelling machine, Bending machine, Pushing Machine, Sand-blasting machine etc |
| Thickness: | View Our Thickness: Schedule 5S, SCH10, SCH20, SCH10, SCH20, SCH30, SCHTD, SCH40, SCH60, XS, SCH80, SCH100, SCH120, SCH140, SCH160. |
| Standard: | MSS-SP-43 Type B Fittings, ANSI B16.28 Fittings, JIS B2312 Fittings, JIS B2313 Fittings, ANSI B16.9 Fittings, MSS-SP-43 Type A Fittings, MSS-SP-43 Type b Fittings |
| STANDARD | WERKSTOFF NR. | UNS |
| Duplex 2205 | 1.4462 | S31803 / S32205 |
| Specification | ASTM A 815, ASME SA 815, ASTM A 182, ASME SA 182 |
| Type | Seamless / Welded / Fabricated |
| Range | ½”NB to 24″NB in Sch 10S, 40S, 80S, 160s, XXS |
| Dimensions | ANSI/ASME B16.9, B16.28, MSS-SP-43 |
| Grade | S31803 |
|---|---|
| C | 0.030 maximum |
| Mn | 2.00 maximum |
| Si | 1.00 maximum |
| P | 0.030 maximum |
| S | 0.020 maximum |
| Cr | 22.0 – 23.0 |
| Mo | 3.0 – 3.5 |
| Ni | 4.50 – 6.50 |
| N | 0.14 – 0.20 |
| Fe | 63.72 min |
| Gr. | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
| S31803 / S32205 | 7.805 | 0.285 | 1420 – 1465 | 2588 – 2669 |
| Pressure Rating (psig) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NPS (inch) |
Pipe Schedule. | OD (inch) |
Wall Thick. (in) |
Temperature | ||||||||
| Duplex Steel 100 Fitting | Duplex Steel 200 Fitting | Duplex Steel 300 Fitting | Duplex Steel 400 Fitting | Duplex Steel 500 Fitting | ||||||||
| Allowable Stress (Pressure Rating) | ||||||||||||
| 16700 | 16700 | 16700 | 15500 | 14400 | ||||||||
| 1" | 40 | 1.315 | 0.133 | 2205 | 2205 | 2205 | 2047 | 1902 | ||||
| 80 | 1.315 | 0.179 | 3061 | 3061 | 3061 | 2841 | 2640 | |||||
| 160 | 1.315 | 0.250 | 4493 | 4493 | 4493 | 4170 | 3874 | |||||
| 1 1/2" | 40 | 1.900 | 0.145 | 1629 | 1629 | 1629 | 1512 | 1404 | ||||
| 80 | 1.900 | 0.200 | 2303 | 2303 | 2303 | 2138 | 1986 | |||||
| 160 | 1.900 | 0.281 | 3362 | 3362 | 3362 | 3120 | 2899 | |||||
| 2" | 40 | 2.375 | 0.154 | 1371 | 1371 | 1371 | 1272 | 1182 | ||||
| 80 | 2.375 | 0.218 | 1985 | 1985 | 1985 | 1843 | 1712 | |||||
| 160 | 2.375 | 0.344 | 3283 | 3283 | 3283 | 3047 | 2831 | |||||
| 3" | 40 | 3.500 | 0.216 | 1301 | 1301 | 1301 | 1208 | 1122 | ||||
| 80 | 3.500 | 0.300 | 1844 | 1844 | 1844 | 1712 | 1590 | |||||
| 160 | 3.500 | 0.438 | 2787 | 2787 | 2787 | 2587 | 2403 | |||||
| 4" | 40 | 4.500 | 0.237 | 1102 | 1102 | 1102 | 1023 | 950 | ||||
| 80 | 4.500 | 0.337 | 1596 | 1596 | 1596 | 1482 | 1377 | |||||
| 160 | 4.500 | 0.531 | 2611 | 2611 | 2611 | 2424 | 2552 | |||||
| 5" | 40 | 5.563 | 0.258 | 965 | 965 | 965 | 896 | 832 | ||||
| 80 | 5.563 | 0.375 | 1428 | 1428 | 1428 | 1325 | 1231 | |||||
| 160 | 5.563 | 0.625 | 2474 | 2474 | 2474 | 2296 | 2133 | |||||
| 6" | 40 | 6.625 | 0.280 | 877 | 877 | 877 | 814 | 756 | ||||
| 80 | 6.625 | 0.432 | 1379 | 1379 | 1379 | 1280 | 1189 | |||||
| 160 | 6.625 | 0.719 | 2382 | 2382 | 2382 | 2211 | 2054 | |||||
| 8" | 40 | 8.625 | 0.322 | 771 | 771 | 771 | 716 | 665 | ||||
| 80 | 8.625 | 0.500 | 1218 | 1218 | 1218 | 1131 | 1050 | |||||
| 160 | 8.625 | 0.906 | 2298 | 2298 | 2298 | 2133 | 1982 | |||||
| 10" | 40 | 10.750 | 0.365 | 699 | 699 | 699 | 649 | 603 | ||||
| 80 | 10.750 | 0.594 | 1159 | 1159 | 1159 | 1075 | 999 | |||||
| 160 | 10.750 | 1.125 | 2289 | 2289 | 2289 | 2124 | 1974 | |||||
