Introduction
Semi-steel rolling mill rolls are important components of the steel rolling mill. The wear resistance, high temperature resistance and oxidation of semi-steel rolling mill rolls are related to the quality of product steel, production efficiency and service life of equipment. Therefore, the selection of semi steel rolling mill rolls is related to the efficiency, quality and cost of the steel rolling process. It is very important that the failure mode of semi-steel rolling mill rolls be correctly identified and timely preventive and corrective measures be taken to avoid excessive damage and shorten service life. Therefore, it is of great significance to identify and analyze the failure modes of semi-steel rolling mill rolls.
Failure modes of semi-steel rolling mill rolls
1.Wear
Wear of semi-steel rolling mill rolls is the most common form of failure that directly affects the quality of product steel and the service life of equipment. The main forms of wear of semi-steel rolling mill rolls are surface wear, cloud wear, plane wear, etc.
2. Oxidation
due to the high temperature of the semi-steel rolling mill in working condition, the surface of the semi-steel rolling mill rolls is not only inherently oxidized, but also in contact with scale, which accelerates the oxidation of the semi-steel rolling mill rolls.
3. Corrosion
Various corrosive media such as the scale of the semi-steel rolling mill rolls and alternating hot-cold water can cause corrosion on the surface of the semi-steel rolling mill rolls and heavily corrode the semi-steel rolling mill rolls.
4. Thermal Fatigue
When the temperature changes rapidly during the use of the semi-steel rolling mill rolls, thermal fatigue will occur, resulting in surface cracking of the semi-steel rolling mill rolls and reducing the service life of the semi-steel rolling mill rolls.
5. Gross Plastic Deformation
The plastic deformation of the semi-steel rolling mill rolls caused by extremely high rolling forces in the process will cause the surface of the semi-steel rolling mill rolls to bruise, bulge or even collapse, resulting in a decrease in the density of the material and further deterioration of the mechanical properties.
6. Additional Process
Due to the long-term use of semi-steel rolling mill rolls under high temperature, acidic or alkaline environment, the surface of semi-steel rolling mill rolls will also be adversely affected and the mechanical properties of the material will be significantly reduced.
7. Other failures
When the semi-steel rolling mill rolls are cast, some external factors such as improper operation will trap gas in the semi-steel rolling mill rolls and cause blowholes on the surface of the semi-steel rolling mill rolls, forming surface defects and increasing the semi-steel rolling mill rolls Failure rate.
Conclusion
The above are the main failure modes of semi-steel rolling mill rolls, and the selection of semi-steel rolling mill rolls must be made after full consideration of all factors, so as to ensure the normal and stable operation of the semi-steel rolling mill rolls and ensure the production of high-quality product steel.
