Views: 4 Author: Site Editor Publish Time: 2021-09-28 Origin: Site
For spiral welded pipe, the service life is the most important part of the buyer, and the most important part of the service life of spiral welded pipe is to keep the surface of the steel pipe from decarburization. It is well known that after the surface of spiral welded pipe is decarburized, its strength and wear resistance will decrease, which will directly affect the service life of the spiral welded pipe. If the decarburization layer on the spiral welded pipe is not cleaned, the hardness and wear resistance of the spiral welded pipe's surface layer will be reduced accordingly, and during the quenching process, the surface of the workpiece will be caused by the volume change of the inner and outer layers. Cracks are formed.
How to prevent the decarburization of spiral welded pipes has become a problem we are thinking about together. What needs to be done? Maybe these can help you.
To solve the problem of surface decarburization, it is mainly to deal with the heat treatment process, because decarburization and the oxidation of spiral welded pipe are carried out at the same time, so in the process of heat treatment, the spiral welded pipe should be kept away from air as much as possible. This can improve the phenomenon of decarburization.
The media that cause decarburization on the spiral welded pipe surface are mainly oxidizing gases such as oxygen, water vapor and carbon dioxide. When these gases come into contact with the heated spiral welded pipe, they will cause oxidation and decarburization of the spiral welded pipe. Therefore, control the carbon dioxide and carbon dioxide in the furnace. The proportion of carbon monoxide is also very important.
In fact, adding protective gas nitrogen to the spiral welded pipe forging furnace is also very effective. Nitrogen can disperse some oxidizing gases and reduce the decarburization of spiral welded pipes.