Steel pipe processing
There are many steps in the production of steel pipes to obtain such high quality pipes. Satisfactory metallographic structure can be obtained by eliminating work hardening of steel tubes. The process equipment is a bright annealing furnace, mainly used for. Heat treatment of finished stainless steel under protective atmosphere. When the application performance of steel tube is different, the metallographic requirements after bright annealing are different, so the bright heat treatment process will be different.
After cold processing, the residual stress of the steel tube material still exists, which is very unfavorable to the stress corrosion cracking of the pipe. Any degree of cold working will lead to a significant increase in the resistance of the material to stress corrosion cracking. The degree of cold working will also have an adverse effect on the high temperature resistance of austenitic stainless steel. Generally, the higher the working temperature or the higher the requirement of fracture life, the lower the degree of cold working.
As can be seen from the above introduction, the heat treatment process of steel pipe is rather troublesome. In order to obtain qualified metallographic structure, the adjustment part of the cooling section equipment of bright annealing furnace needs to be large. Therefore, advanced bright annealing stoves usually adopt strong convection cooling in their cooling section, with three cooling sections that can independently adjust the air volume. It is divided into three sections along the width of the strip.
