Seamless steel pipes are made of perforated steel with no welds on the surface. They are called seamless steel pipes. According to the production method, seamless steel pipes can be divided into hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, extruded seamless steel pipes, top pipes, etc. According to the cross-sectional shape, seamless steel pipes are divided into two types: circular and special-shaped pipes. Special-shaped pipes include square, elliptical, triangle, hexagonal, melon seed-shaped, star-shaped, and winged pipes. The maximum diameter is 900mm and the minimum diameter is 4mm. Depending on the purpose, there are thick-walled seamless steel pipes and thin-walled seamless steel pipes. Seamless steel pipes are mainly used as petroleum geological drilling pipes, cracked pipes for petrochemicals, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors, and aviation.

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