A kind of manufacturing process of pipe for pmma reactor

Abstract

The invention discloses a manufacturing process of a pipe for a PMMA reactor. The process steps are as follows: blanking→heating→piercing→→first pickling and phosphating lubrication→large deformation cold rolling→annealing→second pickling and phosphating lubrication →heading →cold drawing →non-oxidative normalizing →straightening →cutting the length of the head and tail →flaw detection →finished product. The PMMA reactor tube processed by the above-mentioned process can achieve the required size and mechanical properties, and has simple processing steps, high material utilization rate and low processing cost.

Description

technical field [0001] The invention relates to the technical field of pipe material processing, in particular to a manufacturing process of a pipe for a PMMA reactor. Background technique [0002] Polymethyl methacrylate, referred to as PMMA. Usually in the production of PMMA, a tubular reactor is used. The pipe material that can be used for this kind of tubular reactor can be obtained by processing the round steel billet with the steel grade of Q345D and the diameter size of φ60mm into a steel pipe with an outer diameter of 25mm and a thickness of 3mm. The mechanical properties of this steel pipe must meet the following requirements: Tensile strength 490-630Mpa, yield strength ≥245 Mpa, elongation ≥21%. Usually during processing, four cold drawing steps are required to finally form the finished product. Because the steel pipe needs to be pickled, phosphated and lubricated before each cold drawing process, the processing steps are cumbersome and time consuming. In order...

AI Technical Summary

Problems solved by technology

Since the steel pipe needs to be pickled and phosphated for lubrication before each cold drawing process, the processing steps are cumbersome and time-consuming

In order to facilitate the cold drawing process, it is necessary to carry out the steps of heading and re-heading on the steel pipe first, so as to form a cold-drawn head that can be bitten by the drawing trolley. Because the specifications of the cold-drawn head are different from the specifications of the steel pipe ultimately required, usually The finished product can only be formed after the cold-drawing head is cut off, so that the material utilization rate of the processing technology for processing PMMA reactor tubes using four cold-drawing processing steps is low, and the processing cost is high