Stainless Steel 316L 90° Long Radius Welded Elbow

Stainless Steel 316L 90° Long Radius Welded Elbow

The Gold Standard for Corrosion Resistance and Flow Efficiency

Our Stainless Steel 316L 90° Long Radius (LR) Welded Elbow is a premium piping component engineered for superior performance in aggressive environments. Manufactured from ASTM A403 WP316L, this fitting combines the enhanced corrosion resistance of Molybdenum-enriched steel with the low-carbon benefits of the "L" grade, which prevents sensitization (carbide precipitation) during welding.

Designed with a Long Radius (1.5D) curvature, this elbow ensures a smooth directional change that minimizes pressure drop and flow turbulence. The welded construction (typically using Electric Resistance Welding or Submerged Arc Welding) makes it a cost-effective and robust solution for large-scale industrial piping systems where hygiene and durability are critical.

Key Features & Benefits

• Superior Corrosion Resistance: The 316L alloy (containing Molybdenum) offers exceptional resistance to pitting and crevice corrosion, particularly in chloride-rich environments (e.g., marine, coastal, or chemical processing).

• Optimized for Welding: The "L" grade (Low Carbon) ensures excellent weldability. It minimizes the risk of intergranular corrosion at the welding interface, making it ideal for systems requiring extensive fabrication.

• Smooth Flow Dynamics: The Long Radius (LR) design (center-to-face distance = 1.5 x Nominal Pipe Size) reduces friction loss and turbulence compared to short-radius elbows, protecting pumps and valves from excessive wear.

• High Durability: The welded construction provides high structural integrity and impact resistance, suitable for high-pressure and high-temperature applications.

• Sanitary & Hygienic: The smooth internal surface (which can be pickled or polished) prevents bacterial buildup, making it suitable for food, beverage, and pharmaceutical industries.

Technical Specifications

• Material Grade: ASTM A403 WP316L / ASME SA403 WP316L

• Chemical Composition:

• Chromium (Cr): 16.0 – 18.0%

• Nickel (Ni): 10.0 – 14.0%

• Molybdenum (Mo): 2.0 – 3.0%

• Carbon (C): ≤ 0.03% (Low Carbon)

• Size Range: 1/2" to 48" (DN15 to DN1200)

• Wall Thickness: SCH 5S, 10S, 40S, 80S, 160S, XXS

• Radius: Long Radius (LR) = 1.5D (Nominal Pipe Size)

• Angle: 90 Degrees

• Connection Type: Butt Weld (Beveled Ends for welding)

• Standards:

• Dimensions: ASME B16.9 (Factory-made Wrought Fittings)

• Material: ASTM A403 / ASME SA403

Applications

• Chemical & Petrochemical: Transporting aggressive acids, solvents, and chlorides.

• Marine & Offshore: Seawater cooling systems and saltwater piping (due to Molybdenum content).

• Food & Beverage: Brewing, dairy, and food processing lines requiring sanitary conditions.

• Pharmaceuticals: High-purity water systems and biotech processing.

• Pulp & Paper: Bleach plants and chemical recovery lines.

Manufacturing & Quality Assurance

• Welding Process: The elbow is formed from steel plate or coil and welded using automated processes (ERW or SAW) to ensure a consistent, high-strength seam.

• Heat Treatment: Solution annealing is performed to relieve internal stresses and restore the corrosion-resistant properties of the steel.

• Testing:

• Hydrostatic Testing: To verify pressure containment.

• Radiography (RT) / Ultrasonic Testing (UT): To ensure the integrity of the weld seam.

• PMI Testing: Positive Material Identification to verify the 316L chemical composition.

• Surface Finish: Typically pickled and passivated to remove contaminants and enhance the protective oxide layer.

Packaging

To prevent corrosion and mechanical damage during transit, these elbows are bundled in seaworthy wooden crates or plywood boxes. Protective caps are applied to the bevel ends, and desiccants are included to control moisture. Each fitting is clearly marked with the heat number, size, schedule, and "316L" for traceability.