Questions about hot rolling and cold drawing
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When looking up information, I looked up the inner and outer diameters of some pipes and always separated hot-rolled and cold-drawn ones. But I want to know what our factory is using now and how to distinguish them. In other words, how can we tell whether a pipe is hot-rolled or cold-drawn?
Cold-drawn tubes have higher precision, while hot-rolled tubes have lower precision. Cold-drawn tubes are mostly used in situations with strict accuracy requirements, such as heat exchange tubes in heat exchangers. The nominal diameter of cold drawn pipe is not too large.
The meaning of the first floor is that in fact, in our general workshops where materials are transported, the public pipes are generally hot-rolled, so to speak.
That's right. Most commonly used pipes are hot rolled.
Hot-rolled pipes have larger diameters and lower precision, which can be seen from pipe standards such as GB/T8163 or GB3087.