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Product Overview
A Weld Neck Flange (WN Flange) features a long tapered hub that is butt welded directly to the pipe, creating a strong and permanent connection. This design minimizes stress concentration at the base of the flange and provides excellent structural integrity, making it the preferred choice for high-pressure and high-temperature services.
At Moksh Tubes & Fittings LLP, we manufacture precision-engineered Weld Neck Flanges using premium-quality raw materials and advanced machining processes. Available in a wide range of sizes, pressure classes, and material grades, our flanges are suitable for oil & gas, petrochemical, chemical processing, power generation, marine, and other industrial piping systems.
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Specifications
| Specification | Details |
|---|---|
| Product | Weld Neck Flange |
| Standards | ASME B16.5, ASME B16.47, EN 1092-1, DIN, BS, JIS |
| Material | Stainless Steel, Carbon Steel, Alloy Steel, Duplex, Super Duplex, Nickel Alloys & Titanium |
| Size Range | ½" NB to 60" NB |
| Pressure Class | Class 150, 300, 600, 900, 1500 & 2500 |
| Facing Type | RF, RTJ & FF |
| End Connection | Butt Weld |
| Surface Finish | Machined, Anti-Rust Coated, Pickled or Polished |
| Manufacturing | Forged & CNC Machined |
Size & Weight Chart
Weld Neck Flanges are manufactured in accordance with ASME B16.5 and ASME B16.47 standards and are available in various pressure classes and sizes.
| Nominal Pipe Size (NB) | Pressure Class | Outside Diameter (mm) | Thickness (mm) | Approx. Weight (kg) |
|---|---|---|---|---|
| ½" | 150 | 90 | 11 | 0.60 |
| ¾" | 150 | 100 | 12 | 0.80 |
| 1" | 150 | 108 | 14 | 1.10 |
| 1½" | 150 | 127 | 16 | 1.80 |
| 2" | 150 | 152 | 19 | 2.90 |
| 3" | 150 | 191 | 24 | 5.20 |
| 4" | 150 | 229 | 24 | 7.80 |
| 6" | 150 | 279 | 27 | 13.50 |
| 8" | 150 | 343 | 30 | 21.80 |
| 10" | 150 | 406 | 32 | 33.20 |
| 12" | 150 | 483 | 35 | 49.50 |
| 16" | 150 | 597 | 38 | 82.00 |
| 20" | 150 | 711 | 43 | 132.50 |
| 24" | 150 | 813 | 48 | 195.00 |
Note: Dimensions and weights are approximate and may vary depending on the pressure class (150–2500), facing type (RF, RTJ, FF), material grade, and applicable ASME B16.5/B16.47 standards. Custom sizes are available on request.
Grades & Equivalent
Stainless Steel Grades
304 / 304L, 316 / 316L
Carbon & Alloy Steel
Carbon Steel ASTM A105
Low Temp CS ASTM A350 LF2
Alloy
Steel ASTM A182 F11/F22/F91
Duplex & Super Duplex
UNS S31803 / S32205
UNS S32750 / S32760
High-Performance Alloys
Inconel®, Monel®, Hastelloy®, Titanium Grade 2
Applications
Weld Neck Flanges are widely used in:
Oil & Gas Pipelines
Petrochemical Plants
Chemical Processing Industries
Power Generation Plants
Refineries
Offshore & Marine Applications
Water & Wastewater Treatment
Pharmaceutical Industry
Food & Beverage Processing
Features & Advantages
Long tapered hub for superior strength
Excellent stress distribution and fatigue resistance
Leak-proof butt weld connection
Suitable for high-pressure and high-temperature applications
Outstanding corrosion and oxidation resistance
High mechanical strength and durability
Long service life with minimal maintenance
Precision-machined sealing faces
Manufactured according to international quality standards
Mechanical Properties
The mechanical properties of Weld Neck Flanges depend on the selected material grade and comply with applicable ASTM and ASME standards. The table below represents typical values for commonly supplied stainless steel grades.
| Property | SS 304 / 304L | SS 316 / 316L |
|---|---|---|
| Tensile Strength (MPa) | 515 Min | 515 Min |
| Yield Strength (MPa) | 205 Min | 205 Min |
| Elongation (%) | 40 Min | 40 Min |
| Hardness (HB Max) | 201 | 217 |
Note: Mechanical properties for Carbon Steel, Alloy Steel, Duplex, Super Duplex, Nickel Alloy, and Titanium Weld Neck Flanges are available in accordance with their respective ASTM/ASME material specifications.
Why Choose Moksh Tubes & Fittings LLP?
Leading Manufacturer, Supplier & Exporter
Premium Quality Forged Flanges
Wide Range of Sizes, Pressure Classes & Material Grades
Ready Stock for Immediate Dispatch
Competitive Pricing
Strict Quality Assurance
Global Export Experience
Complete Documentation Support
Expert Technical Assistance
Frequently Asked Questions (FAQ)
What is a Weld Neck Flange?
A Weld Neck Flange is a forged flange with a long tapered hub that is butt welded to a pipe, providing a strong, leak-proof, and durable connection.
Where are Weld Neck Flanges used?
They are widely used in oil & gas, petrochemical, power plants, refineries, offshore platforms, chemical processing, and other high-pressure industrial piping systems.
Which materials are available?
We manufacture Weld Neck Flanges in stainless steel, carbon steel, alloy steel, duplex, super duplex, nickel alloys, and titanium grades.
Do you provide material test certificates?
Yes. EN 10204 3.1 Material Test Certificates are supplied with every order.
Can you manufacture custom sizes and pressure ratings?
Yes. We manufacture Weld Neck Flanges in standard and customized sizes, pressure classes, and material grades according to customer specifications.
Request a Quote
Looking for a trusted Weld Neck Flanges manufacturer and supplier? Contact Moksh Tubes & Fittings LLP for premium-quality forged flanges, competitive pricing, ready stock, technical support, and fast worldwide delivery. Request your free quotation today.
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