Duplex and Super Duplex UNS S31803 Flanges

Duplex and Super Duplex UNS S31803 Flanges are forged or cast components used to connect pipes, valves, pumps, and other equipment to form a piping system. Manufactured from Duplex Stainless Steel (Alloy 2205 / UNS S31803), these flanges are specified for applications requiring a combination of high strength and exceptional corrosion resistance. They are particularly effective in high-pressure and corrosive environments, resisting pitting, crevice corrosion, and chloride stress corrosion cracking far better than standard austenitic grades. Zeron Fastners supplies a wide variety of types including Weld Neck, Slip-On, Blind, Socket Weld, and Lap Joint Flanges, used extensively in offshore platforms, chemical processing, and power generation industries.

Related Products

Duplex S31803 Hex Bolts Duplex S32205 Stud Bolts Super Duplex S32750 Nuts Duplex S31803 Elbows Duplex S31803 Tees Duplex S31803 Couplings
UNS S31803 Flanges

Duplex and Super Duplex UNS S31803 Flanges 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 Flanges 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 Flanges Feature Products

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

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