Which are the most favored flange materials?

flanges materials

What are flanges for piping?

Various industrial undertakings require the use of pipes in order to transport raw materials or end products. The pipes consist of an entire set-up that we acknowledge as a piping system. This apparatus accommodates a variety of parts that are used to connect different pipes, pumps, and valves to other components that will create a system that will ensure the uninterrupted flow of contents. Flanges are that one integrant that connects different pipes and other constituents. Flange Suppliers in India ensure to make flanges that provide a fail-safe method for integration to an array of industries worldwide. Apart from joining, flanges offer easy dismantling and access in order to provide hassle-free maintenance of the whole network.

A flanged connection usually has

  • Flanges
  • Gasket
  • Bolting

Types of flanges

 According to the usage, let us have a look at the most common types of flanges readily available with flange manufacturers in India

  • Threaded or screwed

Such sort of flange has a threaded bore body which will complement the thread on the pipe or its fitting. This eliminates the hassle of welding unnecessarily.

  • Weld flange

Socket-weld is a type where the pipe is connected to the flange with the help of fillet weld. It is intended for use with low pressure and temperature.

  • Blind flange

These are essentially discs that can be bolted. They are used at the break-off points of piping systems to achieve a seal.

  • Lap joint

These contain two segments which are joined with a butt-weld for installation. This is the only flange that is provided with a flat face.

  • Weld’s neck

Used in systems with multiple angles and turns because of their excellence to withstand them, they too need a butt-weld like lap joint flanges.

  • Slip-on

Most commonly used one since it has a high tolerance to heavy flow and pressure. They are welded to pipes or fittings in order to secure them.

  • Special flange types

Apart from the ones that are used most commonly along with extensive availability, there are certain flanges which we use for specialized operations.

They are namely:

  • Orifice
  • Nipoflange
  • Expander
  • Reducing
  • Long neck

In order to select the right flange, it is utterly important to pair the particular design of flange in accordance with pipes and fittings so as to ensure longevity and durability of entire framework.

How to select the ideal flange for the piping system?

The first and foremost thing that you need to consider is a suitable flange type. However, it is not the only factor. One of the determining characteristics is the type of facing. Face type also decides about gaskets needed.

Different face types are

  • Flat facing

As the name suggests, the surface of this type is even to accommodate the gasket in its entirety.

  • Raised facing

It has an elevation around its bore to fit a circle gasket inside it.

  • Male and female

It contains complementing elements where one part has grooves while another contains elevated portions both of which fit into each other. The female part retains the gasket.

  • Ring joint type

Used in extreme conditions, this mainly lodges gasket in its groove to create a seal.

  • Tongue and groove

As the name implies, such facing has a grooved and a raised part which functions as a firm retainer when seated into each other. They are further categorized as serrated and smooth flanges.

Choosing the right type of facing from a flange supplier is essential for purpose of impeccable gasket selection and hence the seal.

Other variables to make allowances for while choosing an ideal flange

  • The outer diameter of the flange
  • The outer diameter of the pipe corresponding   to the flange
  • Inner bore diameter
  • The thickness of the outer rim
  • Bolt circle diameter

Materials used by flange exporters in India

There is a wide range available keeping in mind to cater to various intended use, temperatures and pressures. They can be tailored from stainless steel, forged carbon steel, aluminum, brass, bronze and several alloys Monel, Inconel, Chrome-moly and so on.

Stainless steel flanges are broadly used as they can sustain high-pressure conditions that make them the best pick for transiting pressurized Gases and Liquids. Other frequently utilized carbon steel flanges are an alloy of iron and carbon. The higher the carbon proportion, the more the toughness and strength. However, it also makes the alloy less ductile and diminishes its melting point.

There is something called ‘lined flanges’ which are lined with a material different from flanges themselves. They are internally customized for specific purposes and consequently, flange material would differ from pipes and fittings.

How do we recognize the right flange based on our needs?

Flanges are selected along with pipes and fittings. You will be easily able to figure out whether it is up to the mark or not as they are classified based on their temperature and pressure tolerance.

Usual classifications are

  1. 150#
  2. 300#
  3. 600#
  4. 900#
  5. 1500#
  6. 2500#


Industries get their orders customized from flange exporters for quite a time. Thankfully, flanges are globally standardized by ASME. You can find a trademark on the outer rim with all important information inscribed such as manufacturer code, material grade, size, ASTM code, and so forth.