Duplex and Super Duplex UNS S31803 Socket Weld Flanges

Duplex and Super Duplex UNS S31803 Socket Weld Flanges (SWF) feature a socket into which the pipe is inserted before being fillet welded around the hub. This design is primarily used on smaller bore (Nominal Pipe Size 4" and smaller), high-pressure piping systems where the integrity of the seal is paramount. Manufactured from Duplex Stainless Steel (Alloy 2205 / UNS S31803), these flanges deliver excellent mechanical performance and superior resistance to corrosion, notably against chloride stress corrosion cracking. Zeron Fastners supplies UNS S31803 Socket Weld Flanges for systems carrying expensive, flammable, or toxic media in chemical, petrochemical, and power generation industries, offering a strong, high-pressure, non-threaded connection.

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Duplex S31803 Hex Bolts Duplex S32205 Stud Bolts Super Duplex S32750 Nuts Duplex S31803 Weld Neck Flanges Duplex S31803 Slip-On Flanges Duplex S31803 Blind Flanges
UNS S31803 Socket Weld Flanges

Duplex and Super Duplex UNS S31803 Socket Weld 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 Socket Weld 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 Socket Weld Flanges Feature Products

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

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