Steel tubes made of whole pieces of metal with no joints on the surface are called seamless tubes.According to the production method, the seamless tube is divided into hot-rolled tube, cold-rolled tube, cold-drawn tube, kneading tube, jacking tube and so on.According to the section shape, the seamless tube is divided into circular and irregular two kinds, irregular tube has square, oval, triangle, hexagon, melon seed shape, star, with a variety of complex shape of fin tube.The maximum diameter is 650mm and the minimum diameter is 0.3mm.According to the different use, there are thick wall tube and thin wall tube.

Seamless tube is mainly used for petroleum geology drilling pipe, cracking pipe for petrochemical industry, boiler tube, bearing tube and high-precision structural steel pipe for cars, tractors and aviation.Seamless tubes have hollow sections, and many are used to transport fluids, such as oil, natural gas, gas, water and some solid materials.Compared with solid steel such as steel tube and round steel, seamless tube has the same bending and torsional strength and lighter weight, which is a kind of economic section steel.

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