Stress Analysis and Structure Optimization of W-Shaped Radiant Tube in Continuous Annealing Furnace

摘要

A large amount of damaged W-shaped radiant tube in cold rolling continuous annealing line has been found in Shougang Jingtang Company in recent years. After excluding harmful element erosion by element analysis, the finite element method was utilized to study the installation structure on the stress field of radiant tube. The results show that the improper installation is the direct reason for cracking and damage of radiant tube, and then the optimization scheme for improving the installation structure of radiant tube is further proposed. The maximum equivalent stress of radiant tube at 850 °C is about 104 MPa after optimization, and there is no large local stress concentration. The damage probability of radiant tube is greatly reduced base on this optimization, and the service life of radiant tube is extended from 2 to 5 years.