Introduction to steel pipes

Steel pipe is a long strip of steel with a hollow section whose length is much greater than its diameter or circumference. Steel pipes are divided into round, square, rectangular and special-shaped steel pipes according to their cross-sectional shapes; they are divided into carbon structural steel pipes, low alloy structural steel pipes, alloy steel pipes and composite steel pipes according to their materials; they are divided into transportation pipelines and engineering structures according to their uses. , steel pipes for thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc.; according to the production process, they are divided into seamless steel pipes and welded steel pipes, among which seamless steel pipes are divided into hot-rolled and cold-rolled (drawn) ) two types, welded steel pipes are divided into straight seam welded steel pipes and spiral seam welded steel pipes.
Steel pipes are not only used to transport fluids and powdery solids, exchange heat energy, and manufacture mechanical parts and containers, but they are also a kind of economical steel. Using steel pipes to manufacture building structural grids, pillars and mechanical supports can reduce weight, save 20 to 40% of metal, and enable factory-like mechanized construction. Using steel pipes to manufacture road bridges can not only save steel and simplify construction, but also greatly reduce the area of ​​protective coating, saving investment and maintenance costs.