ASTM A182 F316L WNRF Forged Stainless Steel Flange
Product Overview
Forged F316L Weld Neck Raised Face Flange for High Corrosion Resistance Piping
ASTM A182 F316L WNRF (Weld Neck Raised Face) Flange is a forged stainless steel flange manufactured for pressure piping systems requiring excellent corrosion resistance and reliable mechanical performance. Produced according to ASTM A182 / ASME SA182 specifications, the flange features a long tapered hub design that provides smooth stress distribution and improved connection strength for high-pressure and high-temperature applications.
The low carbon content of F316L reduces the risk of chromium carbide precipitation after welding, making it suitable for welded piping systems exposed to corrosive environments. With excellent resistance to chloride-containing media, acids and chemical process fluids, ASTM A182 F316L Weld Neck Raised Face Flanges are widely used in chemical processing, petrochemical, marine, offshore and industrial piping systems.
Technical Specifications
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Item
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Specification
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Product Name
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ASTM A182 F316L WNRF Forged Stainless Steel Flange
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Standard
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ASTM A182 / ASME SA182
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Material Grade
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F316L / UNS S31603
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Flange Type
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Weld Neck Raised Face (WNRF)
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Manufacturing Process
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Forged
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Pressure Rating
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Class 150–2500
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Size Range
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NPS 1/2"–24" (Larger Sizes Available)
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Facing Type
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Raised Face (RF)
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Connection Type
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Butt Welding
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Heat Treatment
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Solution Annealed
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Surface Finish
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Machined / Smooth Finish
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Drilling Standard
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ASME B16.5 / ASME B16.47
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Testing
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PMI, Dimensional Inspection, Pressure Test
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Certification
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EN 10204 3.1 MTC Available
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Chemical Composition
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Element
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Content (%)
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Carbon (C)
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≤0.030
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Chromium (Cr)
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16.0–18.0
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Nickel (Ni)
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10.0–14.0
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Molybdenum (Mo)
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2.0–3.0
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Manganese (Mn)
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≤2.00
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Silicon (Si)
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≤1.00
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Phosphorus (P)
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≤0.045
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Sulfur (S)
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≤0.030
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Iron (Fe)
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Balance
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Mechanical Properties
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Property
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Requirement
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Tensile Strength
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≥485 MPa
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Yield Strength
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≥170 MPa
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Elongation
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≥30%
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Hardness
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≤95 HRB
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Product Features
- Excellent Corrosion Resistance
The addition of molybdenum improves resistance to pitting and crevice corrosion, especially in chloride-containing environments such as seawater, chemical processing fluids and industrial cooling systems.
- Low Carbon F316L Material
The low carbon content minimizes sensitization during welding processes, making F316L suitable for welded piping applications requiring improved corrosion resistance after fabrication.
The long tapered hub provides gradual stress transition from flange to pipe, reducing stress concentration and improving connection reliability in pressure piping systems.
- Forged Manufacturing Process
Forging improves material density and mechanical consistency compared with cast flange products, making forged F316L flanges suitable for demanding pressure applications.
- Wide Pressure Class Availability
Available in pressure classes from Class 150 to Class 2500 according to project requirements.
WNRF Flange Design Advantages
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Suitable for high-pressure piping systems
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Better stress distribution compared with slip-on flanges
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Reduced turbulence at the pipe connection
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Suitable for high-temperature service
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Compatible with butt welding installation
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Commonly used in critical process piping
Available Dimensions
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Parameter
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Range
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Size
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NPS 1/2"–24"
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Pressure Class
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150 / 300 / 600 / 900 / 1500 / 2500
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Facing
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RF, FF, RTJ (Optional)
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Bore Type
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Standard / Customized
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Schedule Compatibility
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SCH 5S–XXS
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Custom Design
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Available
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Applications
ASTM A182 F316L WNRF Flanges are widely used in:
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Chemical Processing Plants
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Petrochemical Facilities
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Oil & Gas Pipelines
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Offshore Platforms
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Marine Engineering
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Pharmaceutical Equipment
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Food Processing Systems
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Desalination Plants
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Power Generation
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Water Treatment Facilities
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Industrial Process Piping
Inspection and Testing
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Positive Material Identification (PMI)
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Chemical Composition Analysis
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Mechanical Property Testing
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Dimensional Inspection
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Visual Inspection
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Surface Finish Inspection
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Ultrasonic Testing
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Liquid Penetrant Testing
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Third Party Inspection
Why Choose YUHONG F316L WNRF Flanges
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Manufactured according to ASTM A182 / ASME SA182
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Forged F316L stainless steel construction
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Suitable for corrosive and chloride-containing environments
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Available in multiple pressure classes and dimensions
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PMI and inspection documentation available
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Customized flange solutions supported for industrial projects
Frequently Asked Questions
- What is ASTM A182 F316L WNRF flange?
ASTM A182 F316L WNRF flange is a forged stainless steel weld neck raised face flange manufactured for pressure piping systems requiring corrosion resistance and mechanical strength.
- What is the difference between F316 and F316L flange?
F316L has a lower carbon content than F316, reducing the risk of sensitization after welding and improving corrosion resistance in welded applications.
- Why use a weld neck flange instead of a slip-on flange?
Weld neck flanges provide better stress distribution and are preferred for high-pressure, high-temperature and critical piping systems.
- What pressure classes are available?
F316L WNRF flanges are commonly available in Class 150, 300, 600, 900, 1500 and 2500.
- Can customized dimensions be supplied?
Yes. Customized sizes, drilling patterns, facing types and special requirements can be supplied according to project specifications.
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