Production process of cold drawn seamless pipe

Cold-rolled and cold-drawn seamless pipes are two kinds of seamless pipe production processes, and cold-rolled and cold-drawn mixed production can also be used. The cold drawing process has the advantages of simple equipment, less 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 more complicated and requires more investment, but it can reduce intermediate processes and improve the yield.

Due to the limitation of the number of roll passes and the cost of the rolling mill, the finished product specifications cannot be too many; the finished product produced by the combined production process of cold rolling and cold drawing has the advantages of good steel pipe quality, short processing cycle time, and reduction of intermediate degreasing, heat treatment, shrinkage, and straightening. Straight and other processes, saving energy, reducing metal consumption, less raw material specifications and other advantages.

The pickling of cold-drawn steel pipe blanks can be mixed acid, hydrofluoric acid, etc. Carbon structural steel pipe blanks and alloy structural seamless steel pipe blanks should be pickled, and high-quality carbon structural steel pipes and high-quality alloy structural steel precision seamless pipe blanks should be pickled. Alloy seamless steel pipes should be pickled with mixed acid of nitric acid, and austenitic stainless steel pipes should be pickled with hydrofluoric acid.

Cold-drawn precision seamless steel pipe is a precision cold-drawn seamless pipe with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment. The use of precision seamless pipes to manufacture mechanical structures or hydraulic equipment can greatly save machining hours, improve material utilization, and help improve product quality.