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Welding Neck Flanges
For essential pipe-to-pipe connectivity in a wide range of industries, Welding Neck Flanges from Fortis Forge are known for their exceptional mechanical strength, superior pressure-handling capacity, and resistance to thermal and mechanical stress. Designed with a long tapered hub that transitions smoothly into the pipe wall, these flanges are ideal for critical, high-pressure, and high-temperature applications where absolute integrity is essential.
Manufactured from Carbon Steel (ASTM A105) or Mild Steel (IS 2062) and compliant with ASME B16.5, ASTM, and DIN specifications, Fortis Forge Welding Neck Flanges ensure excellent durability, weldability, and leak-proof performance. These flanges are butt-welded to the pipe, providing a robust structural connection and reducing stress concentration at the flange base, making them suitable for fatigue-prone systems.
With precise machining, strict dimensional control, and thorough quality testing, our welding neck flanges deliver exceptional sealing performance and structural stability. They are widely used in oil & gas, refineries, petrochemical plants, power generation, shipbuilding, and high-pressure water lines, where safety and reliability are non-negotiable.
Available in various pressure ratings (Class 150 to 2500) and facing types (RF, FF, RTJ), Fortis Forge Welding Neck Flanges offer a dependable, high-performance solution for demanding industrial piping systems.
With advanced machining, controlled forging, and strict quality checks, Fortis Forge Slip On Flanges deliver outstanding sealing integrity and structural reliability in challenging industrial environments. These flanges are designed to slip over the pipe and are welded both on the inside and outside, ensuring a strong, leak-proof connection. Suitable for both indoor and outdoor systems, they help reduce installation time and are commonly used in oil & gas, power plants, refineries, chemical processing, and water treatment facilities.
Available in a variety of sizes, pressure ratings, and facing types (like RF, FF), our Slip On Flanges provide secure, durable, and cost-effective solutions for fluid handling and pipeline integrity across critical applications.
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- Size
½” to 48” (DN15–DN1200)
- Standard
ASME B16.5 / BS 3293 / EN 1092-1
- Material
Carbon Steel (ASTM A105) / Mild Steel (IS 2062)
- Enquiry
What is a Welding Neck Flange?
A Welding Neck Flange (also known as a WN Flange) is a high-integrity forged flange designed for high-pressure and high-temperature applications. It features a long tapered hub that provides excellent stress distribution through the welded connection with the pipe.
The neck (or hub) is welded to the pipe, creating a strong, vibration-resistant joint. This design ensures smooth flow transition and minimizes turbulence and erosion at the joint—making it ideal for critical piping systems.
Welding Neck Flanges are used where system integrity and leak-proof connections are essential.
Material Grades We Use
At Fortis Forge, our Welding Neck Flanges are manufactured using:
Carbon Steel (ASTM A105 / ASTM A350 LF2)
→ Offers superior mechanical strength, high pressure and temperature resistance. Perfect for energy, oil & gas, and process industries.
Mild Steel (IS 2062)
→ Cost-effective and easy to fabricate. Suitable for general piping, structural connections, and low-pressure environments.
All flanges are carefully machined and tested to ensure:
Accurate flange face finish (raised face / RTJ)
Uniform wall thickness and hub tapering
High tensile strength and fatigue resistance
Corrosion resistance and pressure integrity
Manufacturing Standards at Fortis Forge
We follow stringent manufacturing processes, including:
Forging & CNC machining for precision
Heat treatment for structural strength
Non-destructive testing (NDT)
Dimensional inspection & pressure testing
100% traceability with test certificates (MTCs)
Our flanges comply with global standards like ASME B16.5, EN 1092-1, and DIN/IS norms.
Applications Across Industries
Fortis Forge Welding Neck Flanges are trusted in:
Oil & Gas Exploration and Refineries
Thermal, Hydro, and Nuclear Power Plants
Petrochemical and Chemical Processing Units
Water Supply and Treatment Facilities
Marine Engineering and Shipbuilding
Structural & High-Pressure Piping Systems
Their strength and durability make them indispensable in systems where safety and reliability are paramount.
Why Choose Fortis Forge?
Certified raw materials with full traceability
Skilled in-house forging and machining capabilities
Strict quality assurance and testing protocols
Timely dispatch and global shipping
Complete technical support and documentation
Weld Neck Flanges – Class 150/300/600, Carbon Steel Weld Neck Flange Fittings, Mild Steel WNRF Flanges, ASTM A105 Weld Neck Flanges, ASME B16.5 Flanges, High Pressure CS/MS WNRF Flanges, Raised Face & RTJ Weld Neck Flanges Manufacturer in India
As a leading manufacturer of Welding Neck Flanges, Fortis Forge is dedicated to delivering high-performance pipe flanges that adhere to stringent international quality standards. Our manufacturing process includes advanced forging, precision machining, accurate boring, and rigorous inspection—ensuring that each Weld Neck Flange meets exacting specifications for sealing performance, dimensional precision, and long-term durability. In India’s highly competitive flange market, our focus on quality, consistency, and customer satisfaction sets us apart.
When selecting Weld Neck Flanges for your piping systems, it is crucial to consider the size, pressure class (150#, 300#, 600#, etc.), material grade, and the application’s service requirements. These flanges feature a long tapered hub that gradually transitions into the pipe, providing reinforcement and reducing stress concentrations. Weld neck flanges are butt-welded to the pipe, making them ideal for high-pressure, high-temperature, and critical applications.
Available in carbon steel and mild steel (ASTM A105, IS 2062) and fully compliant with ASME B16.5, ANSI, and DIN standards, Fortis Forge’s weld neck flanges are engineered for maximum strength, leak-proof connections, and excellent weldability. These flanges are widely used in industries such as oil & gas, power generation, chemical processing, shipbuilding, refineries, and high-temperature steam lines.
Whether you’re working in demanding industrial conditions or handling aggressive fluids and high flow rates, Fortis Forge provides dependable weld neck flange solutions built for performance, longevity, and structural integrity.
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- Welding Neck Flanges Specification
| Specifications | ASME B16.5 / BS 4504 / EN 1092-1 |
| Size Range | ½” to 48” (DN15 to DN1200) |
| Types | Weld Neck Flange, Raised Face (RF), Ring Type Joint (RTJ) |
| Pressure Class | Class 150, 300, 600, 900, 1500, 2500 |
| Material Grades | Carbon Steel (ASTM A105), Mild Steel (IS 2062) |
| Standard | ASTM, ASME, ANSI, DIN, EN, JIS, BS |
| Applications | Oil & Gas, High-Pressure Pipelines, Power Generation, Petrochemical, Offshore, Chemical Plants |
- Weld Neck Flange Dimensions (ASME B16.5)
Class 150
| NPS | Outside Dia (O) | Thickness (tf) | Hub Dia (X) | Length Thru Hub (L) | Bolt Circle (C) | # Holes | Bolt Hole Dia |
|---|---|---|---|---|---|---|---|
| 1/2″ | 3.50″ | 0.38″ | 1.19″ | 1.81″ | 2.38″ | 4 | 0.5″ |
| 3/4″ | 3.88″ | 0.44″ | 1.50″ | 2.00″ | 2.75″ | 4 | 0.5″ |
| 1″ | 4.25″ | 0.50″ | 1.94″ | 2.12″ | 3.12″ | 4 | 0.5″ |
Class 300
| NPS | Outside Dia (O) | Thickness (tf) | Hub Dia (X) | Length Thru Hub (L) | Bolt Circle (C) | # Holes | Bolt Hole Dia |
|---|---|---|---|---|---|---|---|
| 1/2″ | 3.88″ | 0.50″ | — | — | 2.75″ | 4 | 0.62″ |
| 3/4″ | 4.25″ | 0.56″ | — | — | 3.12″ | 4 | 0.62″ |
Class 600
| NPS | Outside Dia (O) | Thickness (tf) | Hub Dia (X) | Length Thru Hub (L) | Bolt Circle (C) | # Holes | Bolt Hole Dia |
|---|---|---|---|---|---|---|---|
| 1/2″ | 4.75″ | 0.75″ | — | — | 3.50″ | 4 | 0.75″ |
| 3/4″ | 5.31″ | 0.88″ | — | — | 3.94″ | 4 | 0.75″ |
Note: The Class 150 data is sourced from ASME B16.5 (via Wermac reference page) :contentReference[oaicite:1]{index=1}. To complete Class 300 and 600, please extract exact figures from ASME B16.5 standard or verified technical charts (e.g. HT Pipe PDFs) :contentReference[oaicite:2]{index=2}.
The Weld Neck Flange price can vary based on size, pressure class (150#, 300#, 600#, etc.), face type (RF, RTJ), material grade, and order quantity. Typically, the price for carbon steel or mild steel weld neck flanges ranges from ₹120 to ₹1,850 per piece, depending on the specifications, standards, and volume ordered. As a reliable weld neck flange manufacturer and supplier in India, Fortis Forge delivers competitively priced products without compromising on dimensional accuracy, strength, or weldability. Our pricing reflects high-quality manufacturing practices and adherence to international standards like ASME B16.5 and ASTM A105, ensuring exceptional value and performance in critical piping systems.
Quality Assurance
To preserve the high standards of our selection of Forged Fittings, Buttweld Fittings, Flanges and we have always adhered to a systematic quality management process.
Team of Experts
Our staff of experts is vibrant and talented, and they have always been our largest supporters and contributors to our success.
- Equivalent Grades of Welding Neck Flanges
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| ASTM A105 | 1.0432 | K03504 | SF 440A | 1501-151-430A | 20 | NF A 36-205 | P250GH / S235JR |
If you would like to inquire or place an order.
+91 83330 05894
Forged Fittings, Buttweld Fittings and Flanges Manufacturer in India
- Manufactured from high-strength carbon steel grades
- Available in forged, buttweld, and flange configurations
- Precision-machined for leak-proof, high-pressure applications
- Heat-treated and normalized to ensure durability and strength
- Tested for dimensional accuracy and pressure resistance
- Corrosion-resistant coatings available on request
- Application Industries
