ASTM A181 flange used for industrial piping applications. Its specification covers two classes' i.e, ASTM A181 class 60 and ASTM A181 class 70. It is a material specification for carbon steel nonstandard as-forged pipeline components such as flanges, round bars, pipe fittings, rings, valve component and so on.sa 181 gr 1 can be stressed and break under pressure and it is less likely to occur than with other types of steel. They have increased strength, and is applicable to a wide range of industries and sectors. ASTM A181 flange contains different types socket weld flange, weld neck flange, slip on flange, spectacle blind flange, long weld neck flange, threaded flange, orifice flange, reducing flange, etc.

A181 flange are successful in pressure bearing and sealing pipe ends in heavy pressure applications like hydraulic system since it has a maximum bending stress at the center. SA-181-70 has carbon content up to 2.1% by weight, it has the same basic composition of iron and carbon, steel types tend to have a variety of alloying elements. On the contrary, it becomes less ductile. Whereas in without heat treatment it reduces its weldability. It And as the carbon element content increases, it becomes harder and stronger after heat treatment. On the contrary, it becomes less ductile. Whereas in without heat treatment it reduces its weldability.