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The biggest difference between thick-walled and thin-walled steel tubes is the thickness of the steel tube wall. Generally speaking, thin-walled steel tubes are cold drawing techniques, while thick-walled steel tubes generally use hot rolling techniques. If they are measured in units of measure, then It is generally accepted that the wall thickness/diameter equal to 0.02 is the watershed of thick-walled steel tubes and thin-walled steel tubes. Thin-walled steel tubes with a wall thickness of less than 0.02 are larger than thick-walled steel tubes. In terms of use, thin-walled steel tubes are commonly used. On the pipeline. Thick-walled steel tubes are mostly used for blanks in hollow parts. Pressure and use on important pipelines.
Thick-walled steel pipes are mainly used in tap water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction. For liquid transport: water supply, drainage. For gas transportation: gas, steam, liquefied petroleum gas. Used for structural purposes: as a pile driving pipe, as a bridge; piers, roads, building structures, etc.
The commonly used domestic materials for thick-walled steel tubes are: Q235A, Q235B, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, 16Mn, 20#, Q345, L245, L290, X42, X46, X70, X80.
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51 steel pipe network recommended steel knowledge: thick-walled steel knowledge
Thick-walled steel pipes, where the ratio of the outside diameter to the wall thickness of the steel pipe is less than 20, are referred to as thick-walled steel pipes. It is mainly used as petroleum geological drilling pipe, cracking pipe for petrochemical industry, boiler pipe, bearing pipe, and high-precision structural pipe for automobiles, tractors and aviation.