The most obvious difference between a square tube and a round tube
is its cross section. The square tube is a square tube that is circular. The square tube belongs to the shaped tube. Compared with the round pipe, the cross-section non-circular shaped pipe has a larger moment of inertia and a section modulus, has greater bending and torsion resistance, is superior in structure, and can reduce its own gravity and save on the advantages of steel. Therefore, square tubes are widely used in construction, machinery manufacturing, steel construction and other projects, shipbuilding, solar power brackets, steel structure engineering, power engineering, power plants, agricultural and chemical machinery, glass curtain walls, automotive chassis, airports, boiler construction, highway railings, building construction, pressure vessels, oil storage tanks, bridges, power station equipment, lifting transport machinery and other high-load welded structural parts. The purpose of the round pipe is mainly for the pipelines of general low-pressure fluids such as water, gas and oil. It is also used as oil well pipes and oil pipes in the petroleum industry, especially in marine oil fields, oil heaters, condensing coolers and coals for chemical coking equipment. The tube for the distillate oil exchanger, and the bridge tube pile, the support tube for the mine tunnel, and the like.
In most of China's pipeline systems and building steel structures, welded pipes are used. Only chemical, electric power, and smelting equipment use seamless steel pipes
or alloy steel pipes. Therefore, the use of welded pipes is very wide, and the welded pipe has a large market. For the welded pipe, it is nothing more than a square pipe and a round pipe. The square pipe has the advantages of short weld length and large pressure, and has a transcendence in some specific aspects. The advantage of the tube. For the round pipe, the price is low, the production caliber is large, and the inventory is large, which has always occupied half of the welded pipe industry.
Square tubes and round tubes are used in the construction industry in a relatively large number of tubes, but in both applications there are advantages and disadvantages.
1. The use of square rectangular tubes as building columns is better than round steel.
2. At the position of the corner, the square tube can be used to maximize the effective use of the building area.