Stainless flanges: reasons for use and benefits

Flanges on pipelines are constantly exposed to corrosion and an aggressive environment that degrades the properties of the metal and its functional characteristics. The use of Alloy Steel Flanges solves a lot of problems.



Stainless steel is a kind of alloy, in which chrome is present and provides it with anti-corrosion properties. In combination with other advantages of alloyed metal, Carbon Steel Flange has following features:

  • Durable;
  • Resistant to corrosion;
  • Resistant to aggressive environments and high temperatures;
  • Flanges reliably and hermetically connect pipeline parts;
  • Easy to install, disassemble and withstand mechanical stress;
  • Affordable price.

Classification of stainless steel flanges, material features

A standard type of stainless flange is a disk or a ring of a flat shape. At the edges of the circle are holes of the same diameter for attaching the part to the pipeline using bolts. This design allows you to quickly mount and disassemble of the flange.

1

Stainless steel pipe fittings flanges are made according to the current standards of nine types. They differ:

  • Surface shape;
  • mount;
  • Size.

In the shape of the body, stainless steel flanges buy from Stainless Steel Flanges Manufacturer are flat and collar. Collar flanges are installed end-to-end and fastened using welding, and flat can be installed using fasteners (threaded). The inner diameter of the flange and pipe are completely identical.

There is an insignificant amount of WP22 fittings, which are connected using a square flange; therefore, it is possible to produce round and square connecting elements at the plant (GOST 12815-80). Product design features include:

  • Execution (type of surface, 1-9);
  • Pressure and passage
  • Material.

Welded flat ones should be ordered taking into account two sizes – the conditional passage and the outer diameter of the pipe to which it will be attached. DN 100, 125, A420 WPL6, and 150 flanges can be used for pipes with three outside diameters.

An extremely important indicator is pressure. Its value is affected by the size of the part and the shape of the surface. A product welded with a flat surface (standard 12820-80) and free on the welded ring (GOST 12822-80) can withstand about 25 kgf / cm2, while the butt weld flange is designed for 200 kgf / cm2.

Stainless products are made of steel grades:

  • 15XM;
  • 12X18H9T;
  • 06XH28MDT;
  • 10X17H13MZT.

Technical characteristics (strength, the effect of corrosion, resistance to chemical or other aggressive environments) of the connecting elements depend on the composition of the steel. Stainless flanges are designed for use in various conditions.

Applications for Steel Flanges

Stainless steel parts are used to connect the pipeline to the equipment, and to install separate sections. The main advantage of stainless flanges is the ability to withstand salinity, high humidity, temperature fluctuations and other aggressive influences.


Corrosion-proof fittings are in demand in the oil and gas industry. They fully ensure the reliability of the joints, very important for the industry, tightness.

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