Study on Performance and Application of Floor Coatings for Centrifugal Cast Grey Iron Pipes

In the centrifugal casting process, floor coating is one of the key factors. The quality of the coating directly affects not only the service life of the mold and the quality of cast pipes, but also production efficiency. However, excessive gas evolution of the floor coating may cause defects such as pores in cast pipes; unreasonable coating viscosity may lead to poor coating adhesion or uneven coating coverage, which shortens mold service life and results in uneven pipe surface, and even leakage and other defects. Therefore, it is necessary to conduct in-depth research on floor coatings for centrifugal cast gray iron pipes.

1. Functions of Floor Coatings for Centrifugal Cast Gray Iron Pipes

The production process of centrifugal cast pipes requires the coating to withstand the scouring of high-temperature molten iron without peeling off during pouring. After the cast pipe cools and solidifies, the coating should adhere to the mold wall and be pulled out of the mold together with the pipe, and the cooled coating shall be easy to remove.

The coating is also required to have a heat preservation effect to prevent chill formation on cast pipes. In addition, it should have gas storage and exhaust capacity to avoid defects such as pores and depressions on the pipes.

2. Technical Requirements for Floor Coatings for Centrifugal Cast Gray Iron Pipes

3. Influencing Factors on Gas Evolution of Floor Coatings for Centrifugal Cast Gray Iron Pipes

② Influence of binders and suspending agents: Although their proportion in the coating is low, they produce large gas volume. Therefore, the dosage of binders and suspending agents has a notable impact on coating gas evolution.

4. Influencing Factors on Suspension Performance of Floor Coatings for Centrifugal Cast Gray Iron Pipes