Production of steel pipes, hollow sections and similar fittings

This subclass includes: - manufacture of tubes, pipes and blanks of round or non-round cross-section by further working (hot rolling, hot drawing or other hot working) of bars and ingots obtained by hot rolling or continuous casting - manufacture of tubes and pipes of round cross-section (high precision or not) by further working (hot rolling, hot drawing or other hot working) of hot rolled or hot drawn blanks for the production of tubes and pipes of round cross-section by cold rolling or cold drawing and for the production of tubes, pipes and hollow sections of non-round cross-section by cold drawing only - manufacture of welded tubes and pipes of an external diameter exceeding 406.4 mm, obtained from hot-rolled and longitudinally or spirally welded sheets by cold rolling - manufacture of welded tubes and pipes of an external diameter not exceeding 406.4 mm, obtained from hot-rolled and longitudinally or spirally welded sheets by cold rolling production of tubes, obtained from hot-rolled or cold-rolled longitudinally or spirally welded sheets by cold drawing or hot forming, as well as production of tubes and pipes of other cross-sections, obtained from hot-rolled or cold-rolled longitudinally welded strips by cold and hot forming - production of high-precision welded tubes and pipes with a round cross-section of an external diameter not exceeding 406.4 mm, obtained by hot and cold forming, from hot-rolled or cold-rolled longitudinally or spirally welded strips for supply or further processing, for the production of tubes and pipes with a non-circular cross-section of a certain shape by cold rolling or cold drawing methods - production of flat flanges and coupling joints from hot-rolled steel strips - production of forged steel fasteners (for example, hot-rolled flanges) - manufacture of threaded and other connecting fittings of steel for seamless pipes and tubes. Excludes: - manufacture of seamless steel pipes or tubes by centrifugal casting, see 24.52.0