Steel tube manufacturing method

The invention discloses a steel tube manufacturing method. The steel tube manufacturing method comprises the steps of selection and inspection of raw materials, welding of arc striking and extinguishing plates, edge milling of a steel plate, prebending of the steel plate, forming of a JCO forming machine, internal and external welding, cut-off of the arc striking and extinguishing plates, weld flaw inspection, mechanical hole enlargement, rounding of the steel plate and other steps. According to the steel tube manufacturing method, novel Q345GJC-Z15 pipes are selected as the steel plate raw materials; the arc striking and extinguishing plates can ensure the welding quality; an obtained steel tube is firm and tight in welding, the influence of radial force on the service life of the steel tube can be reduced, and therefore the service life of the steel tube is prolonged; meanwhile, the bearing capacity of the steel tube is enhanced, and the use cost is lowered.