What is the production process of cold-drawn seamless pipe?

Cold-rolled and cold-drawn seamless pipes are two kinds of seamless pipe production processes, and they can also be produced by cold-rolling, cold-drawing, cold-drawing and cold-rolling mixture. The cold drawing process has the advantages of simple equipment, low investment and easy operation and maintenance. But the disadvantages are many intermediate processes and low yield. The cold rolling process equipment is complicated and requires a lot of investment, but it can reduce intermediate processes and improve the yield. The product size and surface accuracy of seamless steel tubes are very high, which is especially suitable for the production of high-precision seamless steel tubes and extremely thin-walled precision seamless tube.

Due to the limitation of roll pass number and cost of rolling mill, the finished product specifications should not be too much; 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, reduction of intermediate degreasing, heat treatment, necking, straightening and other processes, energy saving, metal consumption reduction, less raw material specifications and the like.

Mixed acid, hydrofluoric acid, etc. can be used for pickling cold-drawn steel tube blanks. Carbon structural steel tube blank and alloy structural seamless steel tube blank should be pickled with * *, high-quality carbon structural steel tube blank and high-quality alloy structural steel precision seamless tube tube blank should be pickled with * *, high-alloy seamless steel tube with high chromium Cr and nickel Ni content should be pickled with mixed acid with nitric acid, and austenitic stainless steel tube 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 structure and hydraulic equipment. Selecting mechanical structure or hydraulic equipment made in precision seamless tube can greatly save machining time, improve material utilization rate and improve product quality.