Jointed square pipe and Seamless square tube difference

Rectangular tube is a kind of hollow long steel, also known as flat tube, flat square tube or flat square tube (as the name implies). A large number of pipes are used to transport fluids, such as oil, natural gas, water, gas, steam, etc. In addition, when the bending and torsional strength are the same, the weight is light, so they are also widely used to manufacture mechanical parts and engineering structures. Classification of rectangular tubes Classification of rectangular tubes: steel tubes are divided into seamless steel tubes and welded steel tubes (seamed tubes) The characteristics and uses of rectangular tubes.

Rectangular tube product description Rectangular tube is a kind of light thin-walled steel tube with hollow square section, also known as steel cold-formed section. It is a type of section steel with square cross section shape and size made of Q235 hot-rolled or cold-rolled strip or coil as the base material after cold bending and forming and then high-frequency welding. In addition to wall thickening, the corner size and edge straightness of hot-rolled extra thick wall square tubes reach or even exceed the level of resistance welded cold formed square tubes

Galvanized steel pipes are made of steel ingots or solid tube blanks by piercing into tubes, and then by hot rolling, cold rolling or cold drawing. The specification of precision galvanized steel pipe is expressed in outer diameter * wall thickness mm. Galvanized steel pipes are divided into hot rolled and cold rolled (pulled) galvanized steel pipes. Hot rolled galvanized steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, large diameter straight seam steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes. In addition to ordinary steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, large diameter straight seam steel pipes, petroleum cracking pipes and other steel pipes, cold-rolled (galvanized) steel pipes also include carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes and profiled steel pipes. The outer diameter of hot-rolled seamless pipe is generally more than 32mm, and the wall thickness is 2.5-75mm. The diameter of cold-rolled galvanized steel pipe can reach 6mm, the wall thickness can reach 0.25mm, and the outer diameter of thin-walled pipe can reach 5mm, and the wall thickness is less than 0.25mm. Cold rolling has higher dimensional accuracy than hot rolling.

Generally, precision galvanized steel pipes are hot-rolled or cold-rolled with carbon bonded steel 16Mn, 5MnV and other low alloy structural steels such as 10, 20, 30, 35, 45, or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other composite steels. 10. 20 and other low-carbon steel seamless pipes are mainly used for fluid transmission pipelines. Precision seamless tubes made of medium carbon steel such as 45 and 40Cr are used to manufacture mechanical parts, such as stressed parts of automobiles and tractors. Generally, galvanized steel pipes shall be subject to strength and flattening test. Hot rolled steel pipes shall be delivered in hot rolled state or heat treated state; Cold rolling is delivered in heat treatment state.

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