![]() ![]() Special-purpose seamless pipes include seamless pipes for boilers, chemical and electric power, seamless steel pipes for geology, and seamless pipes for petroleum. if used to withstand liquid pressure, shall also be subjected to a hydraulic test.ģ. Steel pipes supplied according to categories a and b. According to the water pressure test supply. Supply according to chemical composition and mechanical properties Ĭ. According to different purposes, it can be supplied in three categories:Ī. General-purpose seamless steel pipes are rolled by ordinary carbon structural steel, low-alloy structural steel or alloy structural steel, with the largest output, and are mainly used as pipelines or structural parts for conveying fluids.Ģ. 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.ġ. ![]() According to different purposes, there are thick-walled seamless steel pipes and thin-walled seamless steel pipes. The maximum diameter is 900mm and the minimum diameter is 4mm. Special-shaped pipes include square, oval, triangular, hexagonal, melon seed, star, and finned pipes. According to the cross-sectional shape, seamless steel pipes are divided into two types: round and special-shaped. ![]() 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, and top pipes. Seamless steel pipes are perforated from whole round steel, and steel pipes without welds on the surface are called seamless steel pipes. ![]()
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