Due to the red rust and matte surface phenomenon of 27SIM hot-rolled seamless pipe during production and use, this not only affects its appearance, but also may have an impact on its performance and service life. Therefore, this paper will focus on analyzing the causes of red rust and matte surface phenomenon of 27simn hot-rolled seamless pipes, and take corresponding prevention and solution measures.
1. Causes of red rust.
The red rust of 27SIMN hot-rolled seamless pipe is mainly caused by iron oxide on the surface of the pipe. In the environment of high temperature and humidity, the surface of the pipe is prone to oxidation reaction, forming rust. In addition, the surface defects that may exist in the production process of pipes, such as scratches and protrusions, are also easy to become a breeding ground for red rust.
Second, the cause of hemp noodles.
The matte surface of 27simn hot-rolled seamless pipe is mainly caused by the roughness of the surface of the pipe. In the process of high-temperature rolling, defects such as bulges and depressions are easily formed on the surface of the pipe, resulting in an increase in surface roughness and the formation of a hemp surface. In addition, the iron oxide on the surface of the pipe will also have a certain effect on the formation of the hemp surface.
3. Preventive and remedial measures.
In view of the red rust and hemp surface problems of 27SIM hot-rolled seamless pipes, we can prevent and solve them from the following aspects:
1.Strengthen the protection of the pipe surface: By coating the surface of the pipe with anti-rust oil, spraying plastic and other methods, it can effectively prevent oxidation and corrosion on the surface of the pipe, thereby reducing the generation of red rust. At the same time, these protective measures can also improve the smoothness of the pipe surface and reduce the appearance of matte surfaces.
2.Improve the production quality of pipes: In the production process, quality control should be strengthened to avoid defects such as scratches and protrusions on the surface of pipes. At the same time, the rolling temperature and cooling rate should be reasonably controlled to reduce the roughness of the surface of the pipe and reduce the incidence of hemp surface.
3.Strengthen the management of storage and use environment: During storage and use, the pipe should be kept dry and ventilated, and the environment with high temperature and high humidity should be avoided. This can effectively delay the oxidation and corrosion process on the surface of the pipe, and reduce the generation of red rust. At the same time, it can also avoid mechanical damage to the pipe during use, which will affect its beauty and service life.
4.Regular surface treatment and maintenance: For pipes that have appeared red rust and hemp surface, surface treatment methods such as pickling, sandblasting, and sanding can be used to repair them. These methods can effectively remove iron oxide and defects on the surface of the pipe, and restore its aesthetics and performance. At the same time, the surface inspection and maintenance of the pipe should also be carried out regularly, and the surface problems should be found and dealt with in time to ensure its long-term stable use.