Duplex and Super Duplex UNS S31803 Pipe Fittings

Duplex and Super Duplex UNS S31803 Pipe Fittings are components used to connect, route, and terminate piping systems. Manufactured from Duplex Stainless Steel (Alloy 2205 / UNS S31803), these fittings provide the same superior corrosion resistance and high strength as the base alloy, making them ideal for aggressive fluid handling systems. Common types include elbows (to change direction), reducers (to change pipe diameter), and tees (to divide flow). These fittings are crucial in chemical processing, oil and gas pipelines, desalination plants, and pulp and paper industries, where resistance to chloride stress corrosion cracking and localized corrosion is vital for system integrity and longevity. Zeron Fastners supplies a comprehensive range of butt-weld and forged fittings in this grade.

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Duplex S31803 Hex Bolts Duplex S32205 Stud Bolts Super Duplex S32750 Nuts Duplex S31803 Flanges Duplex S31803 Washers Duplex S31803 Threaded Rods
UNS S31803 Pipe Fittings

Duplex and Super Duplex UNS S31803 Pipe Fittings Chemical Composition

Element Content (%)
Carbon (C) 0.030 max
Manganese (Mn) 2.00 max
Silicon (Si) 1.00 max
Phosphorus (P) 0.030 max
Sulfur (S) 0.020 max
Chromium (Cr) 21.0 – 23.0
Nickel (Ni) 4.5 – 6.5
Molybdenum (Mo) 2.5 – 3.5
Nitrogen (N) 0.08 – 0.20

Duplex and Super Duplex UNS S31803 Pipe Fittings Mechanical Properties

Property Value
Tensile Strength (min) 620 MPa (90 ksi)
Yield Strength (0.2% Offset min) 450 MPa (65 ksi)
Elongation in 4D (min) 25%
Hardness (Brinell max) 290 HB

Duplex and Super Duplex UNS S31803 Pipe Fittings Feature Products

Super Duplex S32750 Flanges Monel 400 Socket Cap Screws SS 316 Pipe Fittings Alloy Steel Cap Screws

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