Weld Neck Flanges
Weld Neck Flanges are high-strength pipe flanges designed with a long tapered hub to provide excellent stress distribution and secure welded connections. Manufactured from premium materials, they offer superior durability, pressure resistance, corrosion protection, and reliable performance for oil & gas, petrochemical, refineries, power plants, chemical processing, and critical industrial applications.
Overview
Weld Neck Flanges are heavy-duty industrial flanges designed with a long tapered neck that is welded directly to the pipe, creating a strong and permanent connection. The smooth transition from flange thickness to pipe wall helps reduce stress concentration and improves overall system reliability.
These flanges are widely preferred for high-pressure, high-temperature, and critical service applications because of their excellent structural strength and leak-proof performance. Their design ensures proper alignment, superior fatigue resistance, and long-lasting operation in demanding environments.
Veltronova Industries supplies premium quality Weld Neck Flanges manufactured using advanced technology and carefully selected raw materials. Available in various sizes, pressure ratings, face types, and material grades, our Weld Neck Flanges are widely used in oil & gas, petrochemical plants, refineries, chemical processing, offshore, marine, and power generation industries.
Technical Specifications
| Material | Grades Available | Standards | Size Range | Pressure Class | Types | Face Finish |
|---|---|---|---|---|---|---|
| Carbon Steel Weld Neck Flanges | ASTM A105, A350 LF2 | ASME B16.5, ASME B16.47, ANSI | ½” – 60” | Class 150 – Class 2500 | Raised Face Weld Neck, RTJ Weld Neck | RF, RTJ, FF |
| Stainless Steel Weld Neck Flanges | SS 304/304L, 316/316L, 321, 347, 904L | ASTM A182, ASME B16.5 | ½” – 60” | Class 150 – Class 2500 | Weld Neck Pipe Flange | Polished, Raised Face |
| Alloy Steel Weld Neck Flanges | ASTM A182 F5, F9, F11, F22, F91 | ASTM A182, ANSI B16.5 | ½” – 48” | Class 150 – Class 2500 | High Pressure Weld Neck Flange | RF, RTJ Finish |
| Duplex / Super Duplex Weld Neck Flanges | UNS S31803, S32205, S32750, S32760 | ASTM A182 | ½” – 48” | Class 150 – Class 2500 | Weld Neck Industrial Flange | Pickled & Passivated |
| Inconel Weld Neck Flanges | Inconel 600, 601, 625, 718 | ASTM B564 | ½” – 24” | Class 150 – Class 2500 | Weld Neck Flange | Polished Finish |
| Hastelloy Weld Neck Flanges | Hastelloy C22, C276 | ASTM B564 | ½” – 24” | Class 150 – Class 2500 | Industrial Weld Neck Flange | Polished, Pickled |
| Monel Weld Neck Flanges | Monel 400, K500 | ASTM B564 | ½” – 24” | Class 150 – Class 1500 | Weld Neck Pipe Flange | Machined Finish |
| Titanium Weld Neck Flanges | Titanium Gr.1, Gr.2, Gr.5 | ASTM B381 | ½” – 24” | Class 150 – Class 1500 | Weld Neck Flanges | Pickled, Polished |
Features & Advantages of Weld Neck Flanges
Improves stress distribution for enhanced structural integrity.
Improves stress distribution for enhanced structural integrity.
Improves stress distribution for enhanced structural integrity.
Improves stress distribution for enhanced structural integrity.
Improves stress distribution for enhanced structural integrity.
Improves stress distribution for enhanced structural integrity.
Applications Across Industries
Oil & Gas
Used in upstream, midstream and downstream pipeline systems.
Petrochemical
Used in upstream, midstream and downstream pipeline systems.
Power Generation
Used in upstream, midstream and downstream pipeline systems.
Chemical Processing
Used in upstream, midstream and downstream pipeline systems.
Marine & Offshore
Used in upstream, midstream and downstream pipeline systems.
Water Treatment
Used in upstream, midstream and downstream pipeline systems.
Frequently Asked Questions
Technical questions on our Weld Neck Flanges, answered by our engineering team.
Weld Neck Flanges are used in high-pressure and high-temperature piping systems where strong welded connections and excellent stress resistance are required.
The tapered hub provides smooth stress distribution between the pipe and flange, reducing fatigue and improving connection strength.
Weld Neck Flanges are available in Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel, Super Duplex Steel, Inconel, Hastelloy, Monel, Nickel Alloy, and Titanium materials.
They are commonly used in oil & gas, refineries, petrochemical plants, power plants, chemical industries, offshore platforms, marine, and heavy engineering industries.
Weld Neck Flanges provide superior strength, excellent pressure handling, leak-proof connections, fatigue resistance, corrosion protection, and long-lasting performance in critical applications.
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