Square pipe is a name for square pipes, that is, steel pipes with equal side lengths. Square tubes can be divided into seamless square tubes and welded square tubes according to the presence or absence of welds. Seamless square pipe is a square steel pipe with four corners. It is a square steel pipe formed by cold drawing and extrusion of seamless pipe. There is an essential difference between seamless square pipe and welded square pipe. Steel pipes have a hollow section and are used in large quantities as pipes for transporting fluids. Welded square tube is a square tube made of steel plate or strip steel after crimping and welding.
The general difference between seamless square tube and welded square tube
1. Welded square tube is a hollow square section steel square tube, also known as hollow cold-formed steel. It is a section steel with a square cross-section shape and size made of hot-rolled or cold-rolled strip or coil as a blank, which is formed by cold bending and then high-frequency welding.
Thick-walled square tubes, except for thicker wall thicknesses, have corner dimensions and edge straightness that reach or even exceed the level of resistance-welded cold-formed square tubes, and the size of the R angle is generally between 2 and 3 times the wall thickness. . It is also possible to produce R-angle square tubes of the size required by customers according to the needs of customers;
2. Square tube The seamless square tube is a long strip of steel with a hollow section and no seams around it. It is a square tube formed by extruding a seamless tube through the 4 sides of the mold. The square tube has a hollow section, which is stronger than welded and will not crack.
Applied Differences
1. Welded square pipes are used in construction, machinery manufacturing, and steel construction projects. Shipbuilding, solar power generation support, steel structure engineering, electric power engineering, power plant, agricultural and chemical machinery, glass curtain wall, automobile chassis, airport, boiler construction, highway railing, house construction, etc.
2. Seamless square tubes are widely used in liquid transportation, hydraulic supports, mechanical structures, medium and low pressure, high pressure boiler tubes, heat exchange tubes, gas, petroleum and other industries.
The difference in production process
1. Process flow of welded pipe
Uncoiling--leveling--end cutting and welding--looper-forming--welding--inner and outer welding bead removal--pre-calibration--induction heat treatment--sizing and straightening--eddy current testing--cutting --Hydraulic inspection--Pickling--Final inspection--Packing
2. Seamless square tube process
Round steel--tube billet--inspection--heating--perforation--sizing--hot rolling--flat head--inspection--pickling--spherical annealing--cold drawing--forming--test
The general difference between seamless square tube and welded square tube
1. Welded square tube is a hollow square section steel square tube, also known as hollow cold-formed steel. It is a section steel with a square cross-section shape and size made of hot-rolled or cold-rolled strip or coil as a blank, which is formed by cold bending and then high-frequency welding.
Thick-walled square tubes, except for thicker wall thicknesses, have corner dimensions and edge straightness that reach or even exceed the level of resistance-welded cold-formed square tubes, and the size of the R angle is generally between 2 and 3 times the wall thickness. . It is also possible to produce R-angle square tubes of the size required by customers according to the needs of customers;
2. Square tube The seamless square tube is a long strip of steel with a hollow section and no seams around it. It is a square tube formed by extruding a seamless tube through the 4 sides of the mold. The square tube has a hollow section, which is stronger than welded and will not crack.
Applied Differences
1. Welded square pipes are used in construction, machinery manufacturing, and steel construction projects. Shipbuilding, solar power generation support, steel structure engineering, electric power engineering, power plant, agricultural and chemical machinery, glass curtain wall, automobile chassis, airport, boiler construction, highway railing, house construction, etc.
2. Seamless square tubes are widely used in liquid transportation, hydraulic supports, mechanical structures, medium and low pressure, high pressure boiler tubes, heat exchange tubes, gas, petroleum and other industries.
The difference in production process
1. Process flow of welded pipe
Uncoiling--leveling--end cutting and welding--looper-forming--welding--inner and outer welding bead removal--pre-calibration--induction heat treatment--sizing and straightening--eddy current testing--cutting --Hydraulic inspection--Pickling--Final inspection--Packing
2. Seamless square tube process
Round steel--tube billet--inspection--heating--perforation--sizing--hot rolling--flat head--inspection--pickling--spherical annealing--cold drawing--forming--test
