Duplex and Super Duplex UNS S31803 Blind Flanges

Duplex and Super Duplex UNS S31803 Blind Flanges are solid disc fittings used to block or seal the end of a pipeline, valve, or pressure vessel opening. Unlike other flange types, they have no bore and are often used for isolating sections of piping, testing for pressure, or future extensions. Manufactured from Duplex Stainless Steel (Alloy 2205 / UNS S31803), these flanges provide the ultimate seal integrity, backed by the material's high mechanical strength and exceptional resistance to localized corrosion and chloride stress corrosion cracking. Zeron Fastners supplies these critical components to ensure safe and reliable pressure containment in high-risk industrial environments such as oil and gas processing, chemical refineries, and shipbuilding.

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UNS S31803 Blind Flanges

Duplex and Super Duplex UNS S31803 Blind 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 Blind 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 Blind Flanges Feature Products

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

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