Brief introduction of special seamless pipe
Special section tube. is an economical section steel pipe. Commonly used profiled seamless tubes include cross-sectional, non-circular, equal wall thickness, variable wall thickness, along the length of variable diameter and variable wall thickness, cross section symmetry and asymmetry. Such as square, rectangle, cone, trapezoid, spiral and so on. Special shaped seamless pipe can better adapt to the particularity of the use conditions, save metal and improve the labor productivity of parts manufacturing. It is widely used in aviation, automobile, shipbuilding, mining machinery, agricultural machinery, building, textile and boiler manufacturing and so on. The methods of producing special tubes are cold drawing, electric welding, extrusion and hot rolling, among which cold drawing method has been widely used.
Definition of profiled seamless pipe
Special shape seamless steel pipe is the general name of seamless steel pipe except the round tube. According to the shape and size of steel pipe section, it can be divided into seamless steel pipe with equal wall thickness (code name D), irregular wall seamless steel pipe (BD), variable diameter seamless steel pipe (code name BJ). Special shaped seamless steel tubes are widely used in various structural parts, tools and machinery parts. Compared with the circular tube, the special-shaped tube generally has larger inertia moment and sectional modulus, and has greater bending and torsion resistance, which can greatly reduce the weight of the structure and save steel. The special-shaped pipe is usually divided according to the broken section. According to the material, it can be divided into seamless steel tube special-shaped pipe, aluminum alloy shaped pipe, plastic special-shaped pipe. The following mainly introduces the steel pipe shaped pipe. Tube shaped tube can be divided into oval shaped seamless tube, seamless tube, triangular shaped hexagonal shaped diamond shaped seamless pipe, seamless pipe, seamless pipe, octagonal shaped semi-circular shaped round steel, seamless pipe, special-shaped equilateral hexagonal five petal quincunx shaped seamless tube, seamless tube, double convex shaped concave shaped seamless tube oval shaped, special-shaped seamless tube, seamless tube, conical shaped corrugated shaped seamless tube.
Classification and common dimensions of profiled seamless tubes
Shaped tube, square tube, rectangular shaped profiled pipe, special-shaped pipe, spiral pipe, specification: 20*20mm-500mm, thickness 0.6mm-20mm, spiral steel pipe. The spiral steel pipe specifications, 219mm-2020mm, wall thickness 5mm-20mm. straight specifications are 4 points, 6 points, 1 inch, 1.2 inch, 1.5 inch, 2 inch, 2.5 inch, 3 inch, 4 inch, 5 inch, 6 inch, 8 inch, 102, 108, 127, 133, 139, 159, 168, 177, 194, 219, 273, 325 and other specifications generally refers to the special pipe rectangular tube