Cold-rolled and cold-drawn seamless pipes are two seamless pipe production processes, and cold-rolled, cold-drawn, cold-drawn, and cold-rolled mixed production can also be used. The cold drawing process has the advantages of simple equipment, low investment, and easy operation and maintenance. But the disadvantage is that there are many intermediate processes and low yield. The cold rolling process equipment is more complicated and the investment is large, but it can reduce the intermediate process and increase the yield. The seamless steel pipe product size and the surface precision of the steel pipe are very high, and it is especially suitable for the production of seamless cold drawn precision steel tubes and ultra-thin precision seamless tubes.
Due to the limitation of the number and cost of the rolling mill roll pass, the finished product specifications cannot be too many; the finished product produced by the combined production process of cold rolling and cold drawing has good steel pipe quality, short processing cycle time, and reduces intermediate degreasing, heat treatment, shrinkage, and correction. Straightforward process, saving energy, reducing metal consumption, less raw material specifications and other advantages.
Cold drawn steel pipe billets can be pickled with mixed acid, hydrofluoric acid, etc. High-alloy seamless steel pipes with higher chromium Cr and nickel Ni should be pickled with nitric acid, and austenitic stainless steel pipes should be pickled with hydrofluoric acid. Pickling.
Cold drawn precision seamless steel pipes are precision cold drawn seamless pipes used for mechanical structures and hydraulic equipment with high dimensional accuracy and good surface finish. The use of precision seamless pipes to manufacture mechanical structures or hydraulic equipment can greatly save machining man-hours, improve material utilization, and at the same time help improve product quality.