Cold rolling and cold drawing seamless pipes are two types of seamless pipe production processes, and can also be produced by mixing cold rolling, cold drawing, cold drawing, and cold rolling. Adopting 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 use of cold rolling process equipment is relatively complex and requires a lot of investment, but it can reduce intermediate processes and improve yield. The size and surface accuracy of seamless steel pipe products are very high, making it particularly suitable for the production of high-precision seamless steel pipes and ultra-thin walled precision seamless pipes.
Due to the limitations of the number and cost of rolling mill roll passes, the finished product specifications cannot be too many; The finished products produced by the combined production process of cold rolling and cold drawing have the advantages of good steel pipe quality, short processing cycle time, reduced intermediate degreasing, heat treatment, shrinkage, straightening and other processes, energy saving, reduced metal consumption, and fewer raw material specifications.
Cold drawn steel pipe billets can be pickled using mixed acid, hydrofluoric acid, etc. Carbon structural steel pipe billets and alloy structural seamless steel pipe billets should be pickled. High quality carbon structural steel pipes and precision seamless steel pipe billets of high-quality alloy structural steel should be pickled. High alloy seamless steel pipes with high Cr and Ni content should be pickled with a mixture of nitric acid, while austenitic stainless steel pipes should be pickled with hydrofluoric acid.
Cold drawn precision seamless steel pipes are precision cold drawn seamless pipes with high dimensional accuracy and good surface finish used in mechanical structures and hydraulic equipment. Choosing precision seamless pipes to manufacture mechanical structures or hydraulic equipment can greatly save machining time, improve material utilization, and also help improve product quality.
