Steel with a hollow cross section whose length is much larger than the diameter or perimeter. Divided into circular, square, rectangular and special-shaped steel pipes according to the cross-sectional shape; divided into carbon structural steel pipes, low-alloy structural steel pipes, alloy steel pipes and composite steel pipes according to the material; divided into transportation pipelines, engineering structures, Pipes for thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high pressure equipment, etc .; divided into seamless steel pipes and welded steel pipes according to the production process, of which seamless steel pipes are divided into hot rolling and cold rolling (drawing) Two types of welded steel pipes are divided into straight seam welded pipes and spiral seam welded steel pipes.
Not only is steel pipe used for conveying fluids and powdery solids, exchanging thermal energy, manufacturing machine parts and containers, it is also an economical steel. Manufacturing steel structure grids, pillars and mechanical supports with steel pipes can reduce weight, save 20 to 40% of metal, and realize factory mechanized construction.
是用钢带在高频钢管 机组上焊接成钢管,因此在内壁有条焊缝(俗称内筋).一般用于脚手架,结构管. 镀锌钢管是在焊接钢管 的基础上再热镀锌. 使钢管内外壁同时有一层锌层附着. 镀锌管一般用于低压流体的输送. Seamless steel pipes are produced from round steel, so there are no welds. Because they can withstand large pressures, they are generally used in the chemical and gas transmission industries. Welded steel pipes are welded into steel pipes with steel strips on high-frequency steel pipe units, so There is a welding seam on the inner wall (commonly known as inner tendon). It is generally used for scaffolding and structural pipes. Galvanized steel pipe is hot-dip galvanized on the basis of welded steel pipes . The inner and outer walls of the steel pipe have a zinc layer attached at the same time. Galvanized pipe is generally For the transportation of low-pressure fluid.