Cold drawn steel pipe is a type of steel pipe, which is classified according to different production processes and is different from hot-rolled (expanded) pipe. It is produced through multiple cold drawing processes during the expansion of the diameter of the billet or raw material tube, usually on a single chain or double chain cold drawing machine with a capacity of 0.5-100T. Cold rolled (drawn) steel pipes include not only general steel pipes, low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, machined pipes, thick walled pipes, small-diameter cold drawn pipes with internal molds, but also carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes, and special-shaped steel pipes. Cold drawn steel pipes can have an outer diameter of up to 6mm and a wall thickness of up to 0.25mm, while thin-walled pipes can have an outer diameter of up to 5mm and a wall thickness of less than 0.25mm. Their accuracy and surface quality are significantly better than hot-rolled (expanded) pipes, but due to process constraints, their diameter and length are subject to certain limitations.
Cold drawn or cold-rolled precision seamless steel pipes (GB3639-2000) are used for mechanical structures and hydraulic equipment, with high dimensional accuracy and good surface smoothness.
High precision cold drawn precision steel pipe is a new type of high-tech energy-saving product., The promotion and application of high-precision cold drawn precision steel pipes can save steel, improve processing efficiency, and save energy. High precision cold drawn pipes refer to pipes with strict inner and outer diameter dimensional accuracy (tolerance range), good inner and outer surface smoothness, roundness, straightness, and uniform wall thickness. The main technical indicators of high-precision cold drawn pipes produced by this technology have reached or partially exceeded the requirements of national standard GB8713-88 and international standard ISO4394/I-1980 (E). Please refer to the following table for details: Main technical indicators and standard comparison table. The actual project has achieved GB8713-88 ISO4394/I inner diameter dimension tolerance H8 H9 H10 H8 H9 H10 straightness 0.3/1000 A: 0.3/1000 A: 0.5/1000 B: 1/1000 B: 1/1000 C: 1.5/1000 C: 1.5/1000 Wall thickness% 10 ± Wall thickness% 10 ± Wall thickness% 5 ± Wall thickness deviation roundness 0.04 is not specified.
Formula for calculating the weight of steel pipes: [(outer diameter wall thickness) * wall thickness] * 0.02466=kg/meter (weight per meter)
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