Duplex and Super Duplex UNS S32205 Weld Neck Flanges

The Duplex and Super Duplex UNS S32205 Weld Neck Flange (WN Flange) is characterized by a long, tapered hub that transitions the thickness of the flange to the thickness of the pipe, which is then joined via a single butt-weld. This design is superior for applications involving high pressure, sub-zero temperatures, and high temperatures, as it minimizes stress concentration and provides exceptional reinforcement against pipe expansion and contraction. Zeron Fasteners manufactures these flanges from Duplex 2205 (UNS S32205), which provides approximately double the yield strength of standard austenitic stainless steels and outstanding resistance to chloride stress corrosion cracking and pitting. They are essential in severe service environments like nuclear power, chemical processing, and large-scale industrial pipelines, guaranteeing a reliable, high-integrity, leak-free performance joint.

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UNS S32205 Weld Neck Flanges

Duplex and Super Duplex UNS S32205 Weld Neck Flanges

Manufacturing Specifications
Standard ASME B16.5, ASME B16.47 Series A and B, API 6A
Grades Duplex UNS S32205 (2205), Super Duplex UNS S32750 (2507)
Size Range 1/2 inch to 60 inch
Pressure Class 150 LBS to 2500 LBS
Type Weld Neck Flange (WN), Long Weld Neck Flange (LWN)
Facing Type Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)
Duplex UNS S32205 Weld Neck Flange Diagram

Chemical Composition (UNS S32205)

Element Weight (%)
Carbon (C) Max 0.030
Chromium (Cr) 22.0 – 23.0
Nickel (Ni) 4.50 – 6.50
Molybdenum (Mo) 3.00 – 3.50
Nitrogen (N) 0.14 – 0.20
Manganese (Mn) Max 2.00
Silicon (Si) Max 1.00

Mechanical Properties (UNS S32205)

Property Metric
Tensile Strength 655 MPa (95 ksi)
Yield Strength (0.2 Percent Offset) 450 MPa (65 ksi)
Elongation (Percent in 50mm) 25 Percent min
Hardness (Brinell) 290 HBW max
Impact Energy (at -40 Degree Celsius) 100 J min

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