What Is Seamless Steel Pipe?

Seamless steel pipe is hollow section and a large number of pipeline used for conveying fluid, such as transport oil, natural gas, gas, water pipes and some solid materials, and so on. Compared to other steel and solid steel bar, the same torsional strength in bending, lighter, is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle rack and construction using steel scaffolding ring with steel pipe manufacturing parts, can improve material utilization, simplify the manufacturing process, saving material and machining time, such as bearing rings, jack sets, has been widely used to manufacture steel. Steel or a variety of conventional weapons indispensable material, gun barrels to make steel. Steel shapes in different cross-sectional area can be divided into tube and shaped tubes. As in the perimeter of equal conditions, the largest area of a circle with a circular tube can carry more fluid. In addition, the circular cross section to withstand internal or external radial pressure, the force is uniform, so the vast majority of the pipe is pipe. However, the tube also has some limitations, such as under the conditions by plane bending, tube as good as square, rectangular tube large flexural strength, the skeleton of some farm machinery, steel and wood furniture on the popular square, rectangular tube. Depending on the application should also have other cross-sectional shape shaped pipe.
General seamless steel pipe production process can be divided into two kinds of cold-drawn and hot-rolled, cold-rolled seamless steel pipe production process is generally more complex than hot-rolled, tube first three-roll mill, to be carried out after extrusion Sizing tests, if the surface does not respond to go through a crack pipe cutting machine for cutting, cut to a length of about one meter blank. Then enter the annealing process, the annealing use acidic liquid pickling pickling pay attention to whether there are a lot of bubbling surface generated, if a large number of bubbles generated description of the quality of steel reach the appropriate standards. Appearance rolled seamless steel pipe shorter than hot-rolled seamless steel tubes, cold-rolled seamless steel pipe wall thickness is generally smaller than that of hot-rolled seamless steel pipe, but the surface looks much brighter than the thick-walled seamless steel pipe, the surface is not too more rough, not too many glitches caliber. Hot-rolled seamless delivery status is generally rolled condition after heat treatment delivery. Hot-rolled seamless steel pipe after a rigorous quality control to manual selection of staff, after the inspection to be coated with oil, then followed by the drawing multiple experiments to be carried out after the hot piercing experimental treatment If perforation should be expanding too large straightening correction. After straightening and then transferred by the transfer device to the testing machine for testing experiments, the final label, to be placed in the warehouse layout specifications them.