Brief introduction of steel pipe types

Many people have heard of the definition of steel pipe. Steel pipe is a kind of hollow long steel, which is widely used as pipelines for conveying fluids, such as petroleum, natural gas, water gas, steam, etc. In addition, when the bending torsion strength is the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and The engineering structure is also often used to produce various conventional weapon barrels and shells.

Classification of steel pipes: steel pipes are divided into two categories: seamless steel pipes and welded steel pipes (seamed pipes). According to the cross-sectional shape, they can be divided into round pipes and special-shaped pipes. Round steel pipes are widely used, but there are also some square, rectangular and semi-rectangular pipes. Special-shaped steel pipes such as round hexagonal equilateral triangle octagonal steel pipes must be subjected to hydraulic tests to test the pressure resistance and quality of the steel pipes subjected to fluid pressure. Under the specified pressure, no leakage, wetting or expansion is qualified. Some steel pipes are still qualified. Crimping test, flaring test, flattening test, etc. shall be carried out according to standards or requirements of the buyer. (Guide: the correct selection method of screw type)

Seamless steel tube: seamless steel tube is made of steel ingots or solid tube billets through perforation to make capillary tubes, and then hot-rolled, cold-rolled or cold-drawn into seamless steel tubes. The specifications of seamless steel tubes are expressed as the number of outer diameter * wall thickness in millimeters. Steel pipes are divided into hot-rolled and cold-rolled (dial) seamless steel pipes. Hot-rolled seamless steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes, and other cold-rolled steel pipes. ) In addition to general steel tubes, low and medium pressure boiler tubes, high pressure boiler tubes, alloy steel tubes, stainless steel tubes, petroleum cracking tubes, and other steel tubes, seamless steel tubes also include carbon thin-walled steel tubes, alloy thin-walled steel tubes, stainless thin-walled steel tubes, special-shaped steel tubes, hot-rolled seamless tubes The outer diameter is generally greater than 32mm, the wall thickness is 2.5-75mm, the diameter of cold-rolled seamless steel pipe can be up to 6mm, the wall thickness can be up to 0.25mm, the outer diameter of thin-walled pipe can be up to 5mm, and the wall thickness is less than 0.25mm, cold-rolled than hot-rolled size High precision.

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