There is a certain relationship between the service life of the spiral welded pipe and the surface decarburization of the spiral welded pipe. If the surface is decarburized, the strength and wear resistance of the spiral welded pipe will be reduced, which directly affects the service life of the spiral welded pipe. If the decarburized layer on the spiral welded pipe is not cleaned, the hardness and wear resistance of the surface layer of the spiral welded pipe will be reduced accordingly, and in the process of quenching, the surface of the workpiece will be damaged due to the volume change of the inner and outer layers. Cracks form.
How to prevent the decarburization of spiral welded pipe, the following the answer:
To solve the decarburization problem on the surface, it is necessary to deal with the heat treatment process, because the decarburization and the oxidation of the spiral welded pipe are carried out at the same time, so in the process of heat treatment, the spiral welded pipe should not be in contact with the air as much as possible. This can improve the phenomenon of decarburization.
The media that cause decarburization on the surface of the spiral welded pipe 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 ratio of carbon monoxide is also very important.
It is also very effective to add protective gas nitrogen to the spiral welded pipe forging furnace. Nitrogen can dispel some oxidizing gases and reduce the decarburization of spiral welded pipes.
Post time: Mar-01-2023