Stainless steel weld neck flanges (Weld Neck Flange – WN) offer one of the most robust connection methods in piping systems. The neck, which has the same inner diameter as the pipe, is welded to the pipe by butt welding. This design creates an uninterrupted flow path between the flange and the pipe and extends the system life by distributing the mechanical stress on the weld seam.
Weld neck flanges, which are especially preferred in high pressure, high temperature or vibrating lines, can be safely used in harsh process conditions thanks to their corrosion-resistant stainless steel structure. As Çeliksan Paslanmaz, we offer a wide range of sizes and grades in accordance with international standards.
Material Grades and Properties
Stainless steel weld neck flanges can be manufactured in different stainless steel grades according to the corrosion risk and temperature of the environment in which they will operate:
| Grade | Properties |
|---|---|
| AISI 304 / 304L | A cost-effective and durable option for general purpose use, food industry and standard pressure lines. |
| AISI 316 / 316L | Provides superior resistance in environments with chemicals, seawater or high corrosion risk. |
| AISI 316Ti | Titanium-stabilised special grade that prevents carbide precipitation in high temperature applications. |
| AISI 310S | Suitable for applications requiring extreme temperature resistance, such as furnace and exhaust systems. |
Technical Specifications
| Property | Value / Description |
|---|---|
| Manufacturing Standard | EN 1092-1 (Form B1), ASME B16.5, DIN 2543 |
| Pressure Classes | PN10, PN16, PN25, PN40 or Class 150, 300, 600 |
| Connection Type | Weld Neck – Butt Weld |
| Surface Finish | Standard machined surface or smooth surface on request |
| Number of Holes | Variable according to standards (4, 8, 12 etc.) |
| Size Range | 1/2″ to 24″ or DN15 – DN600 |
| Certification | Material Test Certificate (EN 10204 3.1) can be provided on request. |
Areas of Use
Stainless steel weld neck flanges can be used in different sectors in critical pipelines requiring sealing and durability:
| Sector | Application Area |
|---|---|
| Oil and Gas | High pressure oil, natural gas and derivative fluid transfer lines. |
| Chemical and Petrochemical | Process piping systems carrying corrosive chemicals. |
| Food and Beverage | Liquid food transfer and filling lines in accordance with hygienic standards. |
| Power Plants | High temperature lines such as steam, water and cooling systems. |
| Shipbuilding and Marine | Piping installations resistant to salt water corrosion. |
Advantages of Stainless Steel Weld Neck Flange
| Advantage | Description |
|---|---|
| High Strength | Its neck structure distributes mechanical stress and reduces the risk of fracture. |
| Sealing | Provides sealing even at high pressure with proper welding and gasketing. |
| Flow Continuity | The flange neck diameter is the same as the pipe inner diameter, minimizing turbulence. |
| Long Service Life | Its stainless steel structure is resistant to corrosion and oxidation. |
| Standard Compliance | Easy to replace and install as it is manufactured in accordance with international standards. |
Why Çeliksan Paslanmaz?
Çeliksan Paslanmaz supplies the stainless steel weld neck flanges you need for your pipeline projects from stock in standard sizes or in accordance with the technical specifications for special projects. We help you determine the most suitable connection element for your system by providing engineering support in the selection of pressure class, material grade and size.
Please contact our sales team for current stainless steel weld neck flange prices, dimension tables and stock availability.
