Buy Duplex 2205 spiral wound gaskets direct from Ningbo Kaxite Sealing Materials Co., Ltd., a China-based manufacturer and exporter. UNS S32205 / S31803, also known as 2205 Duplex, is a 22% chromium, 3% molybdenum, nitrogen-alloyed duplex stainless steel with high general, localized and stress corrosion resistance plus high strength and excellent impact toughness. Duplex 2205 offers corrosion resistance superior to 316L and 317L austenitic stainless steel in almost all corrosive media, and its yield strength is about twice that of austenitic grades.
This page is written for procurement engineers, MRO buyers, chemical and petrochemical project sourcing teams and EPC contractors who need a reliable Duplex 2205 spiral wound gasket manufacturer. Whether you are comparing quotes, verifying material certificates or scheduling a bulk delivery for a chemical processing, pulp and paper or offshore project, the sections below cover the technical facts and commercial terms you need to place a firm order.
Yield strength about twice that of austenitic stainless steels, allowing weight saving and more cost-competitive design than 316L or 317L.
High chromium plus molybdenum and nitrogen provides excellent pitting and crevice corrosion resistance in oxidizing and acidic solutions.
Molybdenum and nitrogen work with chromium to deliver superior localized corrosion resistance compared with 316L and 317L.
Nitrogen alloying strengthens the duplex structure and raises pitting resistance without sacrificing toughness.
Duplex 2205 spiral wound gasket is produced from 2205 V-shape steel tape and soft filler such as graphite and PTFE. It has good corrosion resistance superior to 316L or 317L austenitic stainless steel spiral wound gaskets 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 grades.
Alloy 2205 duplex stainless steel is a 22% chromium, 3% molybdenum, 5–6% nickel nitrogen-alloyed duplex stainless steel plate with high general, localized and stress corrosion resistance properties in addition to high strength and excellent impact toughness. The yield strength of Duplex 2205 is about twice that of austenitic stainless steels. This allows a designer to save weight and makes the alloy more cost competitive when compared to 316L or 317L.
Because of its high chromium (22%), molybdenum (3%), and nitrogen (0.18%) contents, the corrosion resistance properties of 2205 duplex stainless steel plate are superior to that of 316L or 317L in most environments. The chromium, molybdenum, and nitrogen in 2205 duplex stainless steel plate also provide excellent resistance to pitting and crevice corrosion even in very oxidizing and acidic solutions.
Bar length is a qualitative comparison of pitting and crevice corrosion resistance in chloride-bearing and oxidizing acidic environments. For a specific medium, send the chloride concentration, temperature and pH so we can confirm the correct winding and filler combination.
| Element | Cr | Ni | Mo | N | C | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|---|---|
| Value | 21–23 | 4.5–6.5 | 2.5–3.5 | 0.08–0.20 | ≤0.03 | ≤2 | ≤1 | ≤0.035 | ≤0.015 |
For a specific heat analysis, request the material certificate with your order. Composition and mechanical values will be confirmed against the mill certificate before shipment.
Duplex 2205 spiral wound gasket is used in pressure vessels, tanks, piping, and heat exchangers in the chemical processing industry, pulp and paper industry digesters, bleaching equipment, and stock-handling systems, food processing equipment.
The choice of winding material is driven by the process medium, chloride concentration, temperature, pressure and design life. Use the comparison below as a starting point, then send the exact medium and operating conditions for a firm recommendation.
| Property | Duplex 2205 / UNS S32205 | SS 317L | SS 316L |
|---|---|---|---|
| Microstructure | Ferritic-austenitic duplex | Austenitic | Austenitic |
| Yield strength | 550 MPa | ~205 MPa | ~205 MPa |
| Pitting and crevice corrosion | Superior | Good | Moderate |
| Chloride SCC resistance | High | Limited | Limited |
| Thermal expansion | Lower than austenitic | Higher | Higher |
| Thermal conductivity | Higher than austenitic | Lower | Lower |
| Typical service | Chemical, pulp and paper, food processing, seawater, chloride service | Chemical, moderate chloride | General chemical, non-chloride |
The winding alloy is only one half of the gasket. The filler must also be compatible with the process medium and operating temperature. For Duplex 2205 the standard fillers are graphite and PTFE, with other options quoted on request.
High-temperature sealing performance for steam, hydrocarbon and refinery service. Preferred when the operating temperature is above the PTFE service envelope and the medium is compatible with graphite.
Excellent chemical resistance against most acids, alkalis, organic acids, inorganic acids and solvents. Preferred for chemical, pickling, acid and low-temperature service when the gasket is paired with a duplex winding.
If your service is high-temperature, oxidizing or chloride-bearing, send the H₂S partial pressure, chloride concentration, operating temperature and pressure so we can confirm the correct filler and winding combination.
Send the following five items with your enquiry. If you already have a flange drawing or an existing gasket sample, attach it and we will match it directly. Our sales engineers reply with a firm unit price, lead time and available samples.
NPS, DN or specific inner and outer diameters for non-standard joints.
Class 150, 300, 600, 900, 1500, 2500 or PN10 to PN250, plus the flange standard such as ASME B16.5 or EN 1092.
Graphite or PTFE as standard; other fillers quoted on request depending on the medium and temperature.
Carbon steel painted as standard; SS 304, SS 316 or Duplex 2205 available for corrosive environments. Specify private-label or OEM marking if required.
Order quantity and destination port so we can quote FOB, CIF or freight-inclusive pricing. MOQ 10 pieces.
Send your flange standard, nominal pipe size, pressure class, filler, inner and outer ring material and quantity. Our sales engineers reply with a firm unit price, lead time and available samples. For urgent chemical, pulp and paper or offshore requirements, contact us by phone or WhatsApp.
Address
No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
