Rectangular tube is a kind of hollow long steel, also known as flat tube, flat square tube or square flat tube (as the name implies). When the bending resistance and torsional strength are the same, the weight is lighter, so it is widely used in the manufacture of mechanical parts and engineering structures.

Rectangular tube is a hollow square section of light thin-walled steel pipe, also known as steel refrigeration bending profile. It is Q235 hot-rolled or cold-rolled strip or coil for the base material by cold bending process after forming and then high-frequency welding made of square cross-sectional shape size of the section steel. Hot rolled extra thick wall square tube in addition to wall thickness thickening, its corner dimensions and edge straightness are up to or even exceed the level of resistance welding cold forming square tube.

Rectangular tube classification: steel pipe is divided into seamless steel pipe and welded steel pipe (seam pipe) hot-rolled seamless square tube, cold-drawn seamless square tube, extruded seamless square tube, welded square tube.

Among them, welded square tube is further divided into.

1, according to the process - arc welding square tube, resistance welding square tube (high frequency, low frequency), gas welding square tube, furnace welding square tube.

2, according to the welding seam - straight seam welded square pipe, spiral welded square pipe.

Applications

Construction, machinery manufacturing, steel construction projects, shipbuilding, solar power generation brackets, steel structure projects, power engineering, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, etc.

During the installation process, the axis line of fixed pipe and moving pipe should be in a straight line, otherwise the rubber ring will be easily topped out, which will affect the quality and speed of installation. Q345 seamless moment pipe should be installed flat, and Q345 seamless moment pipe should be in a straight line with each other, when there is an inclined angle, be careful. Align the interface connecting Q345 seamless moment pipe to the bearing mouth, if the insertion resistance is too large, do not insert it forcibly to prevent the rubber ring from twisting. Rubber ring lubricant is preferable to use vegetable oil; in cold winter, rubber ring can be preheated with hot water to reduce hardness and install quickly.