Stainless steel slip-on flanges (SO) are fittings where a steel pipe is inserted into the inner hole of the flange neck and welded.

A key feature is the short neck, which not only increases the flange's strength but also improves its load-bearing capacity.

Made from high-quality stainless steels such as 304 and 316L, they possess both excellent chemical stability and mechanical properties.

Working Principle

The connection of a stainless steel slip-on flange is achieved through "double-sided fillet welding"

Insertion: Insert the pipe into the inner diameter of the SS SO Flange.

Positioning: The pipe end is typically recessed into the stainless steel flange sealing face (neck top) by approximately one pipe wall thickness.

Welding:

Outer side welding: Perform a circumferential fillet weld at the junction of the flange neck and the pipe.

Inner side welding: Perform a bottom sealing weld at the pipe end inside the flange (depending on pressure requirements).

Sealing: Tighten the bolts to compress the gasket between the two flange faces, achieving a sealing effect.

Product Advantages

Compared to stainless steel plate flanges, the neck structure effectively alleviates stress concentration during welding, resulting in better vibration and impact resistance.

Superior Sealing Performance

The neck design makes the flange less prone to deformation under pressure, ensuring long-term sealing stability.

Corrosion Resistance/Long Service Life

Stainless steel exhibits strong oxidation resistance in chemical and humid environments, reducing subsequent maintenance costs.

Wide Applications

Forged Stainless Steel Slip-On Flange are suitable for medium and low-pressure pipelines and perform better than ordinary flat flanges under conditions of large pressure fluctuations.