High-efficiency production process capable of improving surface accuracy of cold-drawn seamless steel tube

Abstract

The invention relates to a high-efficiency production process capable of improving the surface accuracy of a cold-drawn seamless steel tube, comprising the following steps of: 1) conducting heat treatment: conveying the steel tube into a heat treatment furnace, performing heat treatment at a temperature being 800-1000 DEG C, then performing heat-insulating treatment, wherein the heat-insulating time is 1.5-2.5 times of the thickness of the tube wall of the steel tube, and the heat-insulating temperature is 500-700 DEG C; 2) chemically removing scale cinder: conducting air-cooling on the steel tube to be a normal temperature, then soaking the steel tube in a mixed solution of 15-20% of hydrochloric acid and a release agent for a half of an hour; 3) cleaning: cleaning with clear water; 4) neutralizing: soaking the steel tube into sodium hydroxide solution with a pH value being 10-14 for 0.5-1 hours; 5) conducting a rust prevention procedure: soaking the steel tube in an antirust agent for 3-5 minutes; and 6) fining and straightening: straightening by using an eleven-roll straightening machine, and conducting other steps. The high-efficiency production process disclosed by the invention is good in straightening effect, safe and convenient to use, energy-saving, high in energy utilization rate, and good in scale cinder removing effect.

Description

technical field [0001] The invention relates to a production process for cold-drawn seamless steel pipes, in particular to an efficient production process for improving the surface precision of cold-drawn seamless steel pipes. Background technique [0002] At present, in the manufacturing process of cold-drawn seamless steel pipes, ordinary (oxidized) heat treatment is mostly used in the heat treatment process of domestic traditional seamless steel pipe production, and the production cost and equipment investment are low, but the steel pipes after heat treatment of the finished steel pipes produce serious scale, After straightening, the oxide skin is pressed into the surface of the steel pipe to cause defects such as pits and pits on the surface of the steel pipe, which cannot meet the high-precision requirements for the use of parts. Parts manufacturers increase production costs, but also reduce efficacy. Although a small number of steel pipe production enterprises have pr...

AI Technical Summary

Problems solved by technology

Due to the addition of ferrous nitric acid, the reaction during pickling is too intense, which not only raises the temperature too quickly, but also may cause certain damage to the tube embryo.

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