Thick-walled square tube features and uses Thick-walled square tube production process

The thick-walled square tube , as its name implies, is a square-shaped tube. A variety of materials can be used to form a square tube. The medium is used for, and most of the square tubes are made of steel tubes. After being unpacked, they are flat and curled. Welding is performed to form a circular tube, which is then rolled into a square tube and then cut into required lengths. It is generally 50 pieces per package. The square tube is mostly 10*10*0.8-1.5~500*500*10-25 in terms of spot size. The square tube uses for the structure of square tube, decorative square tube, building square tube, mechanical Square tube and so on.

Thick-walled square tube features and uses

Thick-walled square tube is a kind of hollow square cross-section lightweight thick-walled steel tube, also known as steel cooling bent profile. It is based on Q235 hot-rolled or cold-rolled strip or coil plate as the parent metal after cold bending and forming high-frequency welding and then made of square section shape size of steel. In addition to thickening and thickening of the wall thickness of hot-rolled special thick-walled square tube, its corner size and edge flatness all reach or even exceed the level of resistance-weld cold-formed square tube.
Thick-walled square tube use.

Thick-walled square pipes are used in construction, machinery manufacturing, steel construction projects, shipbuilding, solar power stand, steel structure engineering, power engineering, power plants, agricultural and chemical machinery, glass curtain walls, car chassis, airports, boiler construction, highway railings , House construction, and square pipes almost equal.

Thick-walled square tube performance characteristics

The largest size of the product Rectangular Tube production line is 500mm*500mm*19mm, which is the second largest in the world. The world's largest Japanese Nippon Steel 26-inch square moment tube production line has a maximum specification of 550mm*550mm*22mm. The largest square rectangular tube currently in Europe and America is 400*400*12.7mm.

high strength

In order to reduce self-respect and improve safety performance such as shock and shock resistance, high-strength steels have been widely used at home and abroad, and the material strength limit has reached 630 MPa or even higher. The square rectangular tube produced by the technology has a base material tensile strength of 630 MPa, ranks first in the world according to the product strength grade, and the highest strength of the Japanese Nippon Steel production line product is only 550 MPa. The difference between the two is close to 15%.

Product thickness

The rectangular tube produced by the process has a maximum thickness of 19 mm. The super thickness is not only reflected in the absolute thickness but also in the relative thickness of the product. The thickness is an important indicator of the ease of cold forming. The square tube is expressed by the ratio of edge to thickness. At present, it is generally believed at home and abroad that products with a thickness ratio of less than 10 have a high degree of difficulty in forming. The rectangular tube produced by the process can have a ratio of edge to thickness of a small section and a large wall thickness of up to 7, such as 100mm*100mm*14mm, 120mm*120mm*16mm, and the like.

The cold bending large-size thick-walled square tube made of B490RNQ hot rolled steel fully meets and exceeds the requirements of the national standard Q345B in terms of its room-temperature mechanical properties. Its forming processing performance is equivalent to or better than that of Q345B, and the yield ratio meets the national construction industry code for seismic resistance. The request. At the same time, its high temperature performance is significantly better than that of the equivalent Q345B. At 600, the yield strength of B490RNQ remains at 310 MPa, which is much higher than the 2/3 room temperature yield strength. However, the yield strength of Q345B at the wall thickness of more than 8 mm in the 500 process is already lower than 2 /3 Room temperature yield strength.

Thick-walled square tube production process classification

Thick-walled square tube

according to the production process: hot-rolled thick-walled square tube, cold-drawing thick-walled square tube, extruded thick-walled square tube, welded square tube.

Where welding square tube is divided into:
(a) According to process - arc welding square tube, resistance welding square tube (high frequency, low frequency), gas welding square tube, furnace welding square tube
(b) According to the welding seam - straight seam welding square tube, spiral welding square tube

Thick-walled square tube material classification

The square tube is divided by material: Plain carbon steel square tube and low alloy square tube. Carbon steel is divided into: Q195, Q215, Q235, SS400, 20# steel, 45# steel, etc.; low alloy steel is divided into Q345, 16Mn, Q390, ST52-3 and so on.

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