1.Different appearance: There are no welding marks on the surfaceof the seamless steel pipe, because it is perforated by the tube blank, while the seamed steel pipe is welded, and there will be a welding line on its surface, also called a welding rib.
2.Different pressure: the pressure of seamed steel pipe is about 10MPa, while the pressure of seamless steel pipe is higher.
3.Different uses: seamed steel pipes are mainly used in the construction industry, while seamless pipes are mainly used in the machining industry.
4.Different processes: seamless steel pipes are directly pierced and rolled from billets, while seamed steel pipes are made of steel plates or steel strips through shearing, bending, welding and other processing processes.
Steel pipes are not only used for conveying fluids and powdered solids, exchanging thermal energy, making machine parts and containers, but also an economical steel. The use of steel pipes to make building structure grids, pillars and mechanical supports can reduce weight, save 20 to 40% of metal, and can realize factory mechanized construction. Using steel pipes to manufacture highway bridges can not only save steel and simplify construction, but also greatly reduce the area of protective coating, saving investment and maintenance costs.
Seamless steel pipes have hollow sections and are widely used as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. It is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle frames and steel scaffolding used in construction. The use of steel pipes to make ring parts can improve material utilization, simplify manufacturing processes, save materials and processing Man-hours have been widely used to manufacture steel pipes.
