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The production process of general seamless steel pipes can be divided into two types: cold drawing and hot rolling:

1. The production process of cold-rolled seamless steel pipes is generally more complex than hot-rolled. The pipe blank first needs to undergo three roll continuous rolling, and after extrusion, it needs to undergo sizing testing. If there are no response cracks on the surface, the round pipe needs to be cut by a cutting machine, cutting into a billet with a length of about one meter. Then enter the annealing process, which requires washing with a liquid. When washing, pay attention to whether there are a large number of bubbles on the surface. If there are a large number of bubbles, it indicates that the quality of the steel pipe does not meet the corresponding standards;

2. Visually, cold-rolled seamless steel pipes are shorter than hot-rolled seamless steel pipes. The wall thickness of cold-rolled seamless steel pipes is generally smaller than that of hot-rolled seamless steel pipes, but the surface looks brighter than thick walled seamless steel pipes, with less roughness on the surface and fewer burrs on the diameter.

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