Cold drawing or hot rolling for seamless steel pipes
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I would like to ask: Among the seamless steel pipes specified in GB9948, there are those produced by hot rolling, hot expansion, and cold drawing. What is the approximate outer diameter of pipes that are manufactured by hot rolling? What is the outer diameter of steel pipes that are drawn cold?
This post was last edited by tjsyhx@163.com on 2020-12-5 at 12:58. Hot rolling, cold drawing, and hot expansion are all production processes. According to the current 9948 standards, the pitch for hot rolling can range from 32*3 to 1500*250; the pitch for hot expansion can range from 377*8 to 1500*150. However, the options 377*8 to 530*50 are not cost-effective for thick-walled components. For cold drawing, the pitch generally ranges from 6*1 to 114*15, and it is also not economical to use cold drawing methods for diameters larger than 60. Currently, there is a shortage of available products in the market, and their quality varies. Moreover, these pitch ranges are not fixed rules – they are merely approximate values. The actual production process must be determined based on specific specifications, wall thickness, required quantities, and the actual conditions of use. If you need to purchase piping, feel free to contact me. If you want to discuss the current availability of piping in stock, you can also reach out to me:P
Hot rolling yields the best quality, cold drawing is next, and hot expansion has the worst quality
For thermally expanding pipes, it is unclear whether to use hot-rolled pipes for this process or welded pipes; it is said that welded pipes are used for such expansion