Cause of Red Rust: 20 steel of the same size has no such quality defect. It is determined that 27SiMn steel pipe contains relatively high content of Si. During heating before 27SiMn steel pipe rolling, a special oxidized iron sheet with strong meshing with base metal appears. The oxide iron sheet is not easily peeled off from the matrix at a certain temperature, and red rust is formed after 27SiMn steel pipe cooling.
Causes of hemp flour: the formation of powdered iron oxide sheet attached to the surface of the barren pipe at the back end of the sizing reducer.
Factors affecting the formation of iron oxide:
Effect of temperature: oxidation is a diffusion process in the 27SiMn steel pipe, the higher the temperature, the faster the oxygenation rate.
The effect of heating time: under the same conditions, the longer the heating time, the more oxidation and burn loss of 27SiMn steel pipe.
The phenomenon of red rust and hemp surface at 27SiMn steel pipe can be well solved by controlling the temperature of the waste tube, especially the temperature of reheating furnace.
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