Degreasing method before high temperature treatment of stainless steel tubes

Abstract

The invention discloses a degreasing method before high temperature treatment of stainless steel tubes, which is characterized by comprising the step of heating the stainless steel tubes at the low temperature of between 200 and 400 DEG C before the high temperature treatment to decompose and volatilize the grease on the stainless steel tubes so as to realize degreasing, wherein for optimization, the heating means that the stainless steel tubes are put to the interior of an electric furnace to be heated, and the heating time is 1 to 2 hours. Compared with the prior art, the degreasing method of the invention not only saves time and labor and reduces the labor intensity, but also improves the degreasing effectiveness and efficiency on the surfaces of the stainless steel tubes, and ensures the quality stability of the stainless steel tubes after the high temperature treatment.

Description

technical field [0001] The invention relates to a method for treating the surface of a stainless steel pipe, in particular to a method for degreasing the surface of the stainless steel pipe before high temperature treatment. Background technique [0002] When the stainless steel pipe is cold-worked and deformed, a large force is generated between it and the processing equipment, and it is accompanied by more heat generation. It must be lubricated and cooled with suitable liquid grease to improve the effectiveness and efficiency of the cold-work process and reduce the processing time. equipment wear and tear. However, the stainless steel pipe shows obvious work hardening effect after cold working. Due to the large internal stress, its strength increases and its plasticity decreases. On the one hand, in order to facilitate the further cold working deformation of semi-finished products; on the other hand, in order to make the final product meet the specified technical requirem...

AI Technical Summary

Problems solved by technology

[0004] The traditional method of removing grease before high-temperature treatment of stainless steel pipes is to use degreasing liquid to soak the steel pipe for a long time and wash it repeatedly to clean the grease attached to the inner and outer walls. Degreasing with this method is not only cumbersome and time-consuming The most important thing is that the grease cannot be completely removed after this process operation, especially for the grease removal of smaller-sized steel pipes, it seems to have little effect

Due to the unclean degreasing, in the subsequent high-temperature heating process, the grease carbonizes and penetrates into the steel pipe, causing the chemical composition of the steel pipe surface to change, the carbon content increases, and its intergranular corrosion resistance decreases, which eventually leads to unqualified steel pipe quality