Square and rectangular tubes are a kind of name for square-shaped pipes and rectangular-shaped pipes, that is, steel pipes with equal side lengths. They are made by rolling strip steel through technological processing. Generally, the strip steel is unpacked, flattened, curled, and welded to form a round pipe, and then the round pipe is rolled into a square pipe and then cut to the required length. The following content is mainly about the corresponding uses sorted out by Xiangjia Steel for everyone, hoping they are helped.

Mine-used fluid-transporting welded square and rectangular tubes, with the standard number of GB/T14291-2000. The representative materials are Q235A and B-grade steel, mainly used for straight seam welded square and rectangular tubes for mine ventilation, drainage, and axial gas drainage;

Galvanized welded square tubes for low-pressure fluid transportation, with the standard number of GB/T3091-2008. The representative materials are Q235A, Q235B, Q345B, etc. Mainly used for transporting water, gas, air, oil, and heating hot water or steam, used for general fluids with relatively low pressure;

Stainless steel welded square and rectangular tubes for mechanical structures, with the standard number of GB/T12770-1991. The representative materials are 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, etc. Mainly used in machinery, automobiles, bicycles, furniture, hotels and restaurants decoration and other mechanical parts and structural parts;

Large diameter electric welded square and rectangular tubes for low-pressure fluid transportation, with the standard number of GB/T14980-1994. The representative material is Q235A B-grade. Mainly used for transporting water, sewage, gas, air, heating steam and other low-pressure fluids;

Stainless steel welded square and rectangular tubes for fluid transportation, with the standard number of GB/T12771-1991. The representative materials are 0Cr13, 0Cr19Ni9, 00Cr19Ni11, 00Cr17, 0Cr18Ni11Nb, 0017Cr17Ni14Mo2, etc. Mainly used for transporting low-pressure corrosive media;

Galvanized welded square and rectangular tubes for low-pressure fluid transportation, with the standard number of GB/T3092-2008. The representative materials are the same as above. Mainly used for transporting water, gas, air, oil and heating hot water or steam and other general fluids with relatively low pressure. The surface of the square tube adopts hot-dip galvanizing or cold galvanizing anti-corrosion process.

Square and rectangular tubes for transporting combustible and non-combustible fluids, with the standard number of GB/T9711.1 (GB/T9711.2)-1997. The representative materials are L245-L415, and other pipeline steels. Mainly used for transporting combustible and non-combustible fluids with low or high pressure with square and rectangular tubes, with relatively high requirements;

Spiral square and rectangular tubes for low-pressure transportation (Petroleum Ministry standard), with the standard number of SY/T5037-2008. The representative materials are Q235B, Q345B and other carbon steel materials. Mainly used for low-pressure pipelines for transporting water, petroleum, natural gas, heating, etc.