Carbon steel heads (pipe caps), also known as plugs, covers, pipe caps, or plugs, are used to seal pipelines. Their function is the same as that of pipe plugs, but pipe caps can be directly screwed onto the pipes without the need for other pipe fittings. The design of the pipe cap includes the convex pipe cap, conical shell, reducer section, flat cover and compression opening.
　　The main materials of carbon steel heads include Q235,20#, A3, 16 manganese, Q345B, 45 # steel, etc. The standards include GB/T25198-2010(Standard for Pressure Vessel Heads), and pipeline standards GB/T12459-2005,GB/T13401-2005, etc.
　　The head is an indispensable and important component in pressure vessel equipment in many industries, from petrochemicals, atomic energy to food and pharmaceuticals.
　　The head is the end cover on a pressure vessel and is a major pressure-bearing component of the pressure vessel.