Introduction
ASTM A403 WP316L Seamless 90° Elbow is a stainless steel pipe fitting designed to change the flow direction of pipelines by 90 degrees. Produced from low-carbon austenitic stainless steel 316L, this seamless elbow provides superior resistance to chlorides, acids, and seawater corrosion compared to standard 304 stainless steel.
DLSS supplies Short Radius (SR) 90° elbows, size 2″, thickness SCH80S, manufactured to ASTM A403 and ASME B16.9, ensuring strict dimensional tolerances and durability for high-pressure service. With its enhanced corrosion resistance, WP316L elbows are widely used in oil & gas, offshore, power generation, and chemical processing industries.
Key Features
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Material: ASTM A403 WP316L (Low-carbon stainless steel)
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Type: Seamless (SMLS) for maximum strength and smooth flow
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Design: 90° Short Radius (SR) Elbow – compact for limited-space installations
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Schedule: SCH80S, heavy wall thickness for pressure applications
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Standard: ASME B16.9 – international dimension and tolerance compliance
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Size: 2″ (DN50) Nominal Bore
Specifications
| Item | Details |
|---|---|
| Standard | ASTM A403 / ASME B16.9 |
| Material | Stainless Steel WP316L |
| Type | Seamless 90° Elbow (SMLS) |
| Size | 2″ (DN50) |
| Radius Type | Short Radius (SR) |
| Wall Thickness | SCH80S |
| Surface Finish | Pickled / Polished / Customized |
| Applications | Oil & Gas, Marine, Power Plants, Boilers, Heat Exchangers, Chemicals |
WP304 vs WP316L – Material Comparison
| Item / Grade | WP304 (ASTM A403) | WP316L (ASTM A403) |
|---|---|---|
| Chemical Composition | Cr 18–20%, Ni 8–10.5%, Fe balance | Cr 16–18%, Ni 10–14%, Mo 2–3%, Fe balance |
| Corrosion Resistance | Good in general atmospheric & mild chemicals | Superior – resists chlorides, seawater, acidic media |
| Molybdenum Content | None | 2–3% – enhances pitting & crevice corrosion resistance |
| Carbon Content | ≤0.08% | ≤0.03% – prevents carbide precipitation (welded service) |
| Stress Corrosion Cracking | Moderate performance | Excellent resistance in chloride-rich environments |
| Applications | General piping, water lines, low-corrosion service | Oil & Gas, Marine, Offshore, Chemical, Power Plants |
| Cost Level | Lower | Slightly higher, but longer service life in harsh conditions |
| Summary | Economical choice for mild environments | Best choice for aggressive chemical & marine service |
Professional Summary
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WP304 is suitable for general piping applications where corrosion exposure is moderate.
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WP316L is recommended for offshore, marine, and aggressive chemical service, thanks to its molybdenum addition and low-carbon content.
If your system is chloride-rich (e.g., seawater, brine, acids) → choose WP316L.
If your system is general-purpose, less corrosive → WP304 may be sufficient.
Applications of WP316L Seamless Elbow
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Oil & Gas Industry – pipelines, offshore risers, and subsea service.
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Marine Engineering – shipbuilding, desalination, seawater cooling systems.
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Chemical Processing – reactors, acid piping, scrubbers.
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Power Generation – boilers, heat exchangers, and high-pressure piping.
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Pharma & Food Industry – hygienic piping with high corrosion resistance.
Why Choose DLSS?
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Comprehensive range of stainless steel fittings: elbows, tees, reducers, stub ends.
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Strict Quality Assurance – PMI, Hydro, UT, ET, dimensional inspection.
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Third-Party Inspection – SGS, BV, TUV approved.
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Export Packaging – capped ends, plastic bags, ISPM-15 wooden cases.
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Global References – supplied stainless steel elbows and fittings to oil refineries, power stations, and marine projects in 40+ countries.
