Preparation method of seamless steel tubes

Abstract

The invention relates to a preparation method of seamless steel tubes. The method comprises steps as follows: 1) tube blanks are heated, are perforated on a perforating machine after being heated and are punched on a punching machine; 2) the tube blanks are subjected to pickling, phosphating and saponification treatment and are cold-drawn on a cold-drawing machine after treatment is completed; 3) the tube blanks are subjected to heat treatment in an annealing furnace; 4) the tube blanks are subjected to pickling, phosphating and saponification treatment and are cold-drawn on a cold-drawing machine after treatment is completed; 5) the tube blanks are subjected to phosphating and saponification treatment and are subjected to degreasing treatment after treatment is completed; 6) the tube blanks are subjected to tying treatment on a tying machine; 7) the tube blanks are subjected to pickling, phosphating and saponification treatment for the fourth time and are cold-drawn on the cold-drawing machine after treatment is completed; 8) the tube blanks are subjected to tying treatment on the tying machine; 9) the tube blanks are subjected to heat treatment in an anaerobic annealing furnace; 10) the tube blanks are subjected to straightening treatment on a straightening machine; 11) the tube blanks are subjected to tube cutting treatment on a tube cutting machine. With the method, automatic feeding is adopted, the labor is saved, two steel tubes can be cold-drawn simultaneously, and the cold-drawing efficiency of the steel tubes can be improved.

Description

technical field [0001] The invention relates to a method for preparing a seamless steel pipe. Background technique [0002] Seamless steel pipe is a long strip of steel with a hollow section and no seams around it. Because of its hollow cross-section, seamless steel pipes are widely used as pipes for conveying fluids, such as pipes for conveying oil, natural gas, gas, water, and certain solid materials. Compared with solid steel such as round steel, seamless steel pipe is lighter in weight when the bending and torsional strength is the same. Shafts, bicycle frames, and steel scaffolding used in construction, etc., making ring parts with seamless steel pipes can improve material utilization, simplify manufacturing processes, save materials and processing hours, such as rolling bearing rings, jack sets, etc., have been widely used Made of seamless steel pipe. Seamless steel pipe is also an indispensable material for various conventional weapons, and the barrel, barrel, etc....

AI Technical Summary

Problems solved by technology

[0003] The traditional seamless steel pipe manufacturing not only has poor surface finish of the steel pipe, but also produces stress at the end of the steel pipe, causing the end of the steel pipe to crack