Method for producing small-caliber bearing steel tube

Abstract

The invention discloses a method for producing a small-caliber bearing steel tube. The method comprises the following steps: S1, preparing materials: selecting qualified solid circular tubes for lateruse; S2, acid-pickling and flushing: putting the solid circular tubes in the step S1 into an acid-pickling tank to perform acid-pickling to remove oxide scale, cleaning the solid circular tubes withclear water by 2-3 times to remove residual acid-pickling liquor, thereby obtaining acid-pickled solid circular tubes for later use; S3, thermal treatment: heating the solid circular tubes in the stepS1 for later use; S4, punching: putting the heated solid circular tubes in the step S2 onto a punching machine, punching by the punching machine and obtaining first blank tubes; and S5, rolling: placing core rods with lubricants into the first blank tubes in the step S4. The method has the advantages of being simpler, more convenient and more direct, effectively improving small-caliber bearing steel tube production efficiency, reducing production cost, expanding production specifications, favorably reducing energy consumption and carbon emission, and facilitating environmental protection.

Description

technical field [0001] The invention relates to the technical field of steel pipes, in particular to a method for producing small-diameter bearing steel pipes. Background technique [0002] At present, the known production process of small-diameter GCr15 bearing steel pipes with an outer diameter of less than 114mm mainly includes: using forged or rolled solid round tube blanks, and then heating them to 1060°C to 1180°C in an intermediate frequency or gas heating furnace. Two-roll cross-rolling piercing makes the solid round tube blank into a hollow hot-rolled tube, and the final rolling temperature of the hot-rolled tube is controlled at 950°C to 1000°C. After rolling, it is air-cooled on the cooling bed, and then enters the heat treatment furnace for softening annealing. Multi-pass pickling, cold rolling or cold drawing, spheroidizing annealing of the final product, etc. Or, in the above-mentioned production process, after the solid circular tube billet is processed into ...

AI Technical Summary

Problems solved by technology

Or, in the above-mentioned production process, after the solid circular tube billet is processed into a hollow hot-rolled tube by two-roll cross-rolling and piercing, a hot-rolled multi-stand sizing or reducing process is added, and the final rolling temperature is about 950°C. , the rest of the production process is basically the same as the above-mentioned production process. After hot-piercing steel pipes, there are many cold-rolled and cold-drawn passes, the production cycle is long, the production efficiency is low, and the cost is high; multi-pass cold-rolled and cold-drawn requires repeated softening Heat treatment and pickling, high energy consumption, increased carbon emissions, and environmental pollution. Most of the existing methods for producing small-diameter bearing steel pipes are relatively complicated, and it is not convenient for large-scale production of small-diameter bearing steel pipes. Therefore, we propose a small-diameter production method. Caliber bearing steel pipe method is used to solve the above problems