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Seamless steel pipes are made of whole round steel perforated steel pipes without welds on the surface, which is called seamless steel pipes. According to the production method, seamless steel pipe can be divided into hot-rolled seamless steel pipe, cold-rolled seamless steel pipe, cold-drawn seamless steel pipe, extruded seamless steel pipe, pipe jacking, etc. According to the shape of the section, seamless steel pipes are divided into two types: round and special-shaped, and special-shaped pipes have square, oval, triangular, hexagonal, melon seed, star, and winged pipes. The maximum diameter is 900 mm, and the minimum diameter is 4 mm. According to different uses, there are thick-walled seamless steel pipes and thin-walled seamless steel pipes. Seamless steel pipes are mainly used as petroleum geological drilling pipes, cracking pipes for petrochemical industry, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors, and aviation. Classified broadcast of steel pipes without joints along the perimeter of their cross-section. According to different production methods, it is divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, pipe jacking, etc., all of which have their own process regulations. The materials include ordinary and high-quality carbon structural steel (Q215-A~Q275-A and 10~50 steel), low-alloy steel (09MnV, 16Mn, etc.), alloy steel, stainless acid-resistant steel, etc. According to the use, it is divided into two categories: general use (for water transmission, gas pipelines and structural parts, mechanical parts) and special (for boilers, geological exploration, bearings, acid resistance, etc.). UsageBroadcastSeamless steel pipes are widely used.
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