The quality of high quality cold-drawn steel pipes is guaranteed, the service life is long, and the commodities are expected to be selected with good quality. Faced with many products on the market, how to select the better quality products is a difficult problem. The surface of new products is similar. If only looking at the surface, it is difficult to distinguish the quality of products. The selection of cold-drawn steel pipe is based on its wall thickness. The thickness of the pipe wall is related to the properties of steel, and should not be less than the minimum wall thickness required for transportation, loading and unloading, installation and other links. Usually there are no more than four kinds of steel pipe specifications (including thickness and steel number), and there will be no big difference in the selection of pipe materials. After all, there are several required steel pipe specifications, and there is little difference in the selection of thick wall.
Secondly, in the aspect of welding, the method of distinguishing welding technology is easy to distinguish. It is easy to distinguish from the surface. The quality of cold-drawn steel pipe can be seen from the smooth degree of welding interface. The welding technology requires skilled control of the technicians.
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