
Reducing Weld Neck Flange
At Metrade, we supply premium-grade reducing weld neck flange solutions that deliver a compact, high-strength method for joining pipes of different diameters in demanding applications. These flanges perform reliably in high-pressure and high-temperature systems across industries where long-term integrity, flow efficiency, and durability are critical for safe and consistent operation.
We engineer each component with exceptional precision to ensure a smooth and secure transition between varying pipe sizes. This design approach boosts structural performance, enhances sealing capability, and lowers stress concentrations in key areas. By integrating the function of a standard weld neck flange with a built-in reducer, each product streamlines installation and supports efficient piping layouts. Our rigorous quality controls, wide material selection, and adherence to international manufacturing standards ensure that every reducing weld neck flanges deliver dependable performance in modern industrial environments.
Materials - Carbon Steel
- Low Temperature CS
- Stainless Steel
- Special Stainless Steel
- Alloy Steel
- Nickel Alloy
- Titanium Alloy
Material | Specification | Grades |
|---|---|---|
| Carbon Steel | ASTM A105 | A105 |
| Low Temperature Carbon Steel | ASTM A350 | LF2 and LF3 |
| Stainless Steel and Special Stainless Steel | ASTM A182 | F304/304L, 316/316L, 310, 317, 321, 347, 410, 904, H |
| Alloy Steel(EFW, LSAW, HSAW) | ASTM A182 | F5 / 9 / 11 / 22 / 91 |
| Nickel Alloy 200/201 | B564 | UNS N02200/N02201 |
| Nickel Alloy 276 | B564 | UNS N10276 - Hastelloy C-276 |
| Nickel Alloy 400 | B564 | UNS N04400 - Monel 400 |
| Nickel Alloy 600 | B564 | UNS N06600 - Inconel 600 |
| Nickel Alloy 625 | B564 | UNS N06625 - Inconel 625 |
| Nickel Alloy 800H/800HT | B564 | UNS N08810/N08811 - Incoloy 800H/HT |
| Nickel Alloy 825 | B564 | UNS N08825 - Incoloy 825 |
| Titanium Alloy | B381 | Gr 1 / 2 / 5 / 7 |
A Reducing Weld Neck Flange is a high-strength, precision-engineered component designed to connect pipes of different diameters while ensuring smooth fluid flow and superior structural integrity. It features a long tapered hub that gradually transitions into the pipe, providing excellent reinforcement at the weld joint and minimizing stress concentration. The reducing design eliminates the need for a separate reducer, making it a space-saving and efficient solution for pipeline systems that require size transitions. This flange type is ideal for high-pressure and high-temperature applications due to its robust welded connection, which ensures leak-proof and reliable performance. Typically manufactured from premium materials such as carbon steel, stainless steel, and alloy steel, reducing weld neck flanges offer outstanding resistance to corrosion, heat, and mechanical stress. They are widely used in industries like oil and gas, petrochemical, power generation, and chemical processing, where safety, durability, and precision are critical.

Lap Joint Flange
Long Weld Neck
Orifice Weld Neck
Reducing Slip-On
Reducing SocketWeld
Reducing Threaded
Reducing Weld Neck