S31803 Super Duplex Steel Pipe Fittings Products Description
|
Category |
Details |
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 |
|
Size Range |
Nominal Size: 1/2'' - 48''; Wall Thickness: SCH5S - SCHXXS |
ASME B16.9 |
|
Mechanical Properties |
Tensile Strength: ≥795MPa; Yield Strength: ≥550MPa; Elongation: ≥25% |
ASTM/ASME SA815 |
|
Pressure Rating |
Class 150, Class 300, Class 600, Class 900 |
ASME B16.9 |
|
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 |
ASME B16.9 |
|
Dimensional Tolerance |
Critical Surfaces: ±0.004 inches; Bevel Angle: ±1°; Length Tolerance: ±0.125 inches |
ASME B16.9 |
|
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 Composition
|
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) |
4.5 - 6.5% |
Balances duplex microstructure (austenite + ferrite), enhances toughness and low-temperature ductility |
ASTM/ASME SA815 |
|
Molybdenum (Mo) |
2.5 - 3.5% |
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 |
|
Carbon (C) |
≤ 0.03% |
Controls carbide precipitation, preventing intergranular corrosion during welding/heat exposure |
ASTM/ASME SA815 |
|
Manganese (Mn) |
≤ 2.0% |
Aids in nitrogen solubility, maintains alloy workability without reducing corrosion resistance |
ASTM/ASME SA815 |
|
Silicon (Si) |
≤ 1.0% |
Improves casting/machining performance, kept low to avoid oxide inclusions |
ASTM/ASME SA815 |
|
Phosphorus (P) |
≤ 0.03% |
Minimized to prevent brittleness, especially in high-temperature or pressure applications |
ASTM/ASME SA815 |
|
Sulfur (S) |
≤ 0.02% |
Strictly controlled to avoid hot cracking during welding and reduce corrosion susceptibility |
ASTM/ASME SA815 |
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