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Carbon Steel Flanges: Types and Functions

Flanges are useful to connect valves, pumps, and pipes for the piping system. There are different types of flanges like welded, lap joints, blinds, and many others. The use of carbon steel flanges is widely high in demand. The reason is its excellent features like excellent durability, corrosion resistance, and finishing.

It is useful in various industries. These include agriculture, power, chemical, petrochemical, and others. The flange is an internal or external edge, or a rim (lip), for power like an iron plate flange, such as a T-beam or I-beam; or attachment to another component like a flange at the end of the screw, a steam lever, etc.

Type of carbon steel flanges

There are mainly 6 types of carbon steel flanges available for use. These are the 4 most common:

Welding neck flange

Welding neck flanges are popular for their long tapered neck, with the accompanying connection, and their end is welded to the bottom. The internal diameter of the pipe is the same as the flange. It is useful in extreme jobs where there is a requirement of high stress.

Sliding flanges (slip on)

Slip on Flanges

The tube penetrates the cube of the same as in the form of carbon steel flanges. You do not need to touch the plane to the face to which it is connected with the use of external and internal welding seams. Due to the lower accuracy of the tube life and better positioning flexibility, we can consider it simpler than the neck flange. The mechanical condition of the sliding flange is usually good for exhaustion and strength, but much weaker than the neck-straps.

Blind Flanges

The design is such that it covers the ends of the tube openings, valves, or tubing due to various operating pressures. It is a form of ASME fitting that from a technological point of view is capable to withstand the most extreme working conditions.

Threaded Flanges

Although they do not possess any welding characteristics, they make assembly easy and quick. It is useful for specific applications (e.g., in pipes with high atmospheric temperatures and pressures) where male NPT threaded pipes are utilized.

Characteristics of carbon steel flanges

There are different diameters of Carbon steel flanges that are popular. One of the main reasons is its easy installation and cheap cost. Another advantage of carbon steel flanges is that they can be used as connecting flanges when they work with Type B and Type C ends.

Unlike weld-neck flanges, they do not have a neck to rest on the pipe and, therefore, require double welding. The characteristics of carbon steel flanges include:

. Available in a wide range of diameters

. They take minimal vertical flange space.

. Easy installation and assembly

. Low cost

Reason to use Carbon Steel Flanges

Carbon steel or medium carbon steel is an element of metal. It is a mixture of carbon and iron components. Many components are too small to influence their properties in amounts. In pure carbon steel, the only other elements permitted are: copper (0.60% max), silicon (0.60% max), and manganese (1.65% max).

With more carbon content, the carbon steel flanges achieve toughness and strength. These are less tough and ductile to weld. Higher carbon content decreases the flange melting point and its tolerance to temperature.

The function of the carbon steel flanges

Forged flanges are less carbon-free than molten flanges. They do not oxidize quickly. These flanges are also flat, and the construction of these flanges is fairly lightweight. It also has superior mechanical properties. Improper forging may result in irregular or broad grains. It is higher to harden forging and cracking than the casting flange.

According to the manufacturing cycle, the forging flange comes in a few operational theories in the carbon steel flanges. The usage and production method of the carbon steel flange provide an operating theory. Its basic philosophy is using the insulation efficiency of the carbon steel flange isolating gasket.


Choosing a carbon steel flange means getting the best flange for industrial operations. The types and functions of the carbon steel flanges determine that the flange material is best to use. At Texas Flange, we offer all types of flanges for various systems. Our specialists can help you to identify the right flange for your equipment. If you want more information, contact us today!

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