ASTM A105 carbon steel socket weld fittings coupling
A105 is considered a type of forging carbon steel grade.
Carbon steel also has many classifications, such as one is carbon structural steel or tool steel and so on, structural steel is divided into mechanical or engineering classes. If according to the smelting method, because the method is different, some open hearth steel.
If according to the carbon content to divide, according to its percentage, controlled within 0.25%, it is called low carbon steel, there is a more than 0.6%, called high carbon steel.
If it is divided according to its quality, there is one is ordinary, and one is high quality or extra grade high quality steel.