Cold drawing process
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 to a length of about one meter. Then enter the annealing process, which requires acid washing with an acidic liquid. During acid washing, attention should be paid 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.
Hot rolling process
The specific process of hot rolling technology is not mentioned in detail in the article, but it is mentioned that the production process of cold-rolled seamless steel pipes is generally more complex than hot rolling.
