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Product Overview

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Technical Specifications

Parameter	Value
Compliance Standard	Product Name
S31803 Super Duplex Steel Pipe Fittings	ASTM/ASME SA815
Material Composition	Chromium (21.0-23.0%), Nickel (4.5-6.5%), Molybdenum (2.5-3.5%), Nitrogen (0.14-0.20%), Carbon (≤0.03%), Manganese (≤2.0%)
ASTM/ASME SA815	Nominal Size: 1/2'' - 48''; Wall Thickness: SCH5S - SCHXXS
Mechanical Properties	Tensile Strength: ≥795MPa; Yield Strength: ≥550MPa; Elongation: ≥25%
ASTM/ASME SA815
Pressure Rating	Class 150, Class 300, Class 600, Class 900
Temperature Range	Operating Temp: -40°C to 280°C (continuous service)
ASTM/ASME SA815
Surface Finish Options	Sandblasted, Polished (Ra ≤1.6μm), Passivated, Plastic Coated, Custom Coatings
ASTM A262 Practice A
Available Types	Elbows (45°/90°), Tees (Equal/Reducing), Reducers (Concentric/Eccentric), Caps, Crosses, Flanges
Dimensional Tolerance	Critical Surfaces: ±0.004 inches; Bevel Angle: ±1°; Length Tolerance: ±0.125 inches
Testing Standards	Hydrostatic Pressure Test (1.5× rated pressure, 60s hold), XRF Alloy Analysis (accuracy ±0.001%), Dye Penetrant Inspection
ASTM E165, ASTM A999
Chemical Element	Content Range
Key Function/Control Purpose for S31803 Super Duplex Steel Pipe Fittings
Compliance Standard	Chromium (Cr)
21.0 - 23.0%	Forms a protective oxide layer, core to resisting general and pitting corrosion
ASTM/ASME SA815	Nickel (Ni)
Balances duplex microstructure (austenite + ferrite), enhances toughness and low-temperature ductility	ASTM/ASME SA815
Molybdenum (Mo)	Strengthens corrosion resistance in chloride-rich environments (e.g., seawater, chemical tanks)
ASTM/ASME SA815	Nitrogen (N)
0.14 - 0.20%	Boosts tensile/yield strength, stabilizes austenite phase to avoid brittleness
ASTM/ASME SA815	Controls carbide precipitation, preventing intergranular corrosion during welding/heat exposure
ASTM/ASME SA815	Manganese (Mn)
Aids in nitrogen solubility, maintains alloy workability without reducing corrosion resistance	ASTM/ASME SA815
Silicon (Si)	Improves casting/machining performance, kept low to avoid oxide inclusions
ASTM/ASME SA815	Phosphorus (P)
Minimized to prevent brittleness, especially in high-temperature or pressure applications	ASTM/ASME SA815
Strictly controlled to avoid hot cracking during welding and reduce corrosion susceptibility	ASTM/ASME SA815

Chemical Composition

Element	Content Range	Function	Standard

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Duplex Stainless Steel Pipe Fittings

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S31803 Super Duplex Steel Pipe Fittings

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