Seamless steel pipes are perforated from a whole round steel, and steel pipes without welds onthe surface are called seamless steel pipes. According to the production method, seamless steelpipes 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. According to thecross-sectional shape, seamless     steel  pipes are divided into two types: round and special-shaped.Special-shaped pipes have square, elliptical, triangular, hexagonal, melon-shaped, star-shaped,and finned pipes. The maximum diameter is     900mm  and the minimum diameter is 4mm. 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, petrochemical cracking pipes, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors, and aviation. Seamless steel pipes are     widely     used.

    General-purpose seamless steel pipes are rolled from 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.

    The outer diameter of hot-rolled seamless pipe is generally greater than 32mm and the wall thickness is 2.5-200mm. The outer diameter of cold-rolled seamless pipe can be up to 6mm and 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. Rolling has higher dimensional accuracy than hot rolling.

    Mechanical performance index

    The mechanical properties of steel is an important index to ensure the final use performance (mechanical properties) of the steel, and it depends on the chemical composition of the steel and the heat     treatment system. In the steel pipe standard, according to different application requirements, the tensile properties (tensile strength, yield strength or yield point, elongation), hardness and toughness     indexes are specified, as well as high and low temperature properties required by users.

    Our company is 25years manufacture and specializing in all various kinds of pipe.for example 304,304l 316,316l,201,etc. If you have any need ,please contact us direct.

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