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What are MS Flanges?

Hello and welcome to our blog where we aim to solve all questions regarding industrial fluid transport piping. We will discuss at length regarding industrial MS pipes, how they are manufactured, what are the different kinds, and we will provide some reliable specifications. The primary aim of our blog is to make it a comprehensive database any industrialist or trader who might need specific and reliable information in an instant.

We all know what a pipe is, then, what is a flange?
An MS Flange, or Mild Steel Flange, is a type of flange made from mild steel. It’s commonly used in piping systems to connect pipes and valves. The flange is a circular steel disk with a flared end that is used in welding two components together. The flared end makes the connection incredibly strong and secure and helps to ensure that the piping and plumbing system remains completely sealed. MS Flanges are used to connect pipes, pumps, valves, and other equipment to form a piping system. There are different types of flanges such as the MS blind flange which is used to close a pipeline where other flanges are used to connect more pipes.

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The welding process of MS flange involves the application of pressure and heat, usually generated by induction or an electric current. According to ASME B31.1, to execute a flanged connection using a socket weld flange, the pipe should first be inserted into the socket of the flange until it reaches the bottom. Then, it should be lifted by 1.6 mm and finally welded. Backing flange welding is another process used to secure additional thickness to the root of a weld joint. This process ensures that the joint has enough structural integrity to support its intended use.

There are several types of MS flanges available, each with its unique properties and applications. Some of the common types include:

  • Weld Neck Flange: This type consists of a long, tapered hub and is typically machined from a forging. These flanges are welded to a pipe and are commonly used in high-pressure and high/low-temperature applications.
  • Long Welding Neck Flange: Similar to weld neck flanges, except that the neck is extended and acts like a boring extension. These flanges are designed to be used in place of weld neck flanges and pipe pieces for bolt-up connections.
  • Slip-on Flange: These flanges are very common and are available in a large range of sizes to accommodate systems with higher flow rates and throughput.
  • Threaded Flange: This style has a thread inside the flange bore which fits with the matching male thread on the pipe or fitting.
  • Socket Weld Flange: Ideal for smaller pipe diameters in low-temperature and low-pressure scenarios.
  • Lap Joint Flange: These flanges require butt welding of the stub end to the pipe or fitting with the use of a backing flange to create the flanged connection.
  • Blind Flange: Used to close a pipeline where other flanges are used to connect more pipes.


Each type of flange has its own set of advantages and disadvantages, so it’s important to consider these in relation to the project being undertaken. MS flanges are known for their strength and durability, making them an ideal choice for many different types of applications.