1. Seamless Steel Pipe: Seamless steel pipes can be categorized by production methods, including hot-rolled seamless pipe, cold drawn pipe, precision steel tube, hot expanded pipe, cold spinning pipe, and extruded pipe, etc. (1) Structural seamless steel pipe (GB/T8162-2008) is used for seamless steel pipes in general structures and mechanical structures. (2) Seamless steel pipes for fluid conveyance (GB/T8163-2008) are general seamless steel pipes used for conveying fluids such as water, oil, and gas. (3) Low and medium pressure boiler seamless steel pipes (GB/T3087-2008) are used for manufacturing various structural low and medium pressure boiler superheated steam pipes, boiling water pipes, and locomotive boiler superheated steam pipes.