Generally, the higher the carbon content in carbon steel, the greater the hardness and the higher the strength, but the lower the plasticity.
Carbon steel straight seam steel pipes can be divided into high frequency straight seam steel pipes and submerged arc welded straight seam steel pipes according to the production process. Submerged arc welded straight seam steel pipes are divided into UOE, RBE, JCOE steel pipes, etc. according to their different forming methods.
GB/T3091-1993 (galvanized welded steel pipe for low-pressure fluid transmission)
GB/T3092-1993 (galvanized welded steel pipe for low-pressure fluid transmission)
GB/T14291-1992 (welded steel pipe for mine fluid conveyance)
GB/T14980-1994 (Large-diameter electric-welded steel pipes for low-pressure fluid transportation)
GB/T9711-1997[Petroleum and natural gas industry transmission steel pipes, including GB/T9771.1 (representing grade A steel) and GB/T9711.2 (representing grade B steel)]