Duplex and Super Duplex UNS S31803 Pipe Fittings

**Duplex UNS S31803 Pipe Fittings** (commonly known as Duplex 2205) are essential components in piping systems requiring high strength and exceptional resistance to localized corrosion. Zeron Fastners manufactures a comprehensive range of buttweld fittings, including elbows, tees, reducers, caps, and cross-sections. These fittings offer a dual-phase microstructure consisting of both austenite and ferrite, providing the best properties of both. The S31803 grade is particularly effective in chloride-bearing environments, resisting stress corrosion cracking, pitting, and crevice corrosion better than standard 300-series stainless steels. They are widely utilized in chemical processing, oil and gas exploration, marine applications, and water desalination plants where durability and pressure integrity are paramount.

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UNS S31803 Flanges UNS S32760 Pipe Fittings UNS S31803 Stud Bolts SS 316 Pipe Fittings

Manufacturing Specifications

Standard	ASTM A815 / ASME SA815
Dimensions	ASME/ANSI B16.9, ASME B16.28, MSS-SP-43
Size Range	1/2" NB to 24" NB (Seamless & Welded)
Schedule	Sch 5s, 10s, 40s, 80s, 160s, XXS
Types	90°/45° Elbow, Equal/Unequal Tee, Concentric/Eccentric Reducer, Cap, Stub End

Chemical Composition of UNS S31803

Element	Content (%)
Carbon (C)	0.030 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
Manganese (Mn)	2.00 max
Silicon (Si)	1.00 max

Mechanical Properties of UNS S31803 Fittings

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

Feature Products

UNS S32750 Nuts Inconel 625 Fittings Carbon Steel Fittings