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Types of ASTM A105 Carbon Steel Flange

Views: 5     Author: Site Editor     Publish Time: 2023-11-26      Origin: Site


ASTM A105 carbon steel flanges are a type of pipe connection fitting forged from carbon steel as the raw material. This type of flange has high strength and hardness, good corrosion resistance, and low cost, and is therefore widely used in pipe connections.

Type of ASTM A105 Carbon Steel Flanges

Carbon steel flanges come in a variety of types, including welding neck flanges, slip on flanges, socket flanges, threaded flanges, lap joint flanges, and blind flanges.They are suitable for connecting various types of pipelines and equipment.

Welding Neck Flange

Welding neck flanges are a widely used type of ASTM A105 Carbon Steel flange that requires the use of bolts and gaskets for good sealing. They have corresponding rigid and elastic requirements and a reasonable butt welding thinning transition. They adopt a relatively complex horn-shaped structure, which is suitable for pipelines with large fluctuations in pressure or temperature, or high-temperature, high-pressure, and low-temperature pipelines.The interface thickness should be consistent with the thickness of the connected pipeline to ensure that the welding seal is leak-free.There is also a special type of welding neck flange, the long-neck flange, which is designed according to the design needs of the pipeline and correspondingly increases the height of the flange welding neck to facilitate pipeline connection.

Slip On Flange

The slip on flange includes plate flange and neck slip on flange.

The plate flange is suitable for steel pipeline connections with a nominal pressure not exceeding 2.5 MPa.The sealing surface of the flat welding flange can be made in smooth, concave-convex, and mortise-and-tenon types.The smooth type flat welding flange has the largest application.

The slip on flange with a neck has a lower neck height, which improves the stiffness and load-bearing capacity of the flange.Compared to butt-welding flanges, it requires more welding work and consumes more welding rods, and cannot withstand high temperatures, high pressures, repeated bending, and temperature fluctuations. However, it is easier to install on site, and the process of weld crushing can be omitted, making it more popular.


Socket Weld Flange

Socket weld flanges refer to flanges that are welded on the ends and outside of the pipe by inserting the pipe end into the flange ring ladder. There are two types: with neck and without neck.The flanges with neck have good rigidity, small welding deformation, and good sealing performance, and can be used in applications with pressure ranging from 1.0 to 10.0 MPa.Type B flanges for vessels are also socket welding flanges, and are used in applications with high sealing requirements.

Threaded Flange

Threaded flanges are non-welded flanges that process the inner hole of the flange into pipe threads and are matched with threaded pipes for connection.Compared to flat welding flanges or butt welding flanges, threaded flanges are convenient for installation and maintenance and can be used on pipelines where welding is not allowed on site.Alloy steel flanges have sufficient strength, but are not easy to weld or have poor welding performance. Threaded flanges are also an option.

Lap Joint Flange

Lap Joint Flange are including two-parts that stub end is used to weld to the pipe and LAPJ flange is slid onto the pipe before welding the Stub End.Forged steel flange is a disc-shaped piece of equipment used to connect a pipe to fittings or valve or other component to form a pipework system. Usually flange has been attached to pipe or tube end to, and then a gasket is inserted in the middle to form a seal. Finally they are joined together with bolts and nuts.



Blind Flange

Blind flanges are flanges without holes in the middle, used for sealing the end of pipelines.Blind flanges are also known as blind flanges, which function like heads and caps, but blind flanges are removable sealing devices, while head seals are not removable.The sealing surfaces include flat, convex, concave, tongue and groove, and ring connection surfaces.Materials include carbon steel, stainless steel, alloy steel, etc. Common production standards for blind flanges include ANSI/ASME B16.5 and DIN 2527.ANSI/ASME B16.5 flanges belong to the American standard system.DIN 2527 flanges belong to the German standard flange system.


ASTM A105 carbon steel flanges also have the advantages of easy installation, good plasticity, high temperature stability, good toughness, and low cost.In terms of application, ASTM A105 carbon steel flanges are suitable for connecting liquid, gas, and steam pipelines, and are widely used in the chemical, petroleum, natural gas, and other industries.

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