Traditional roll materials and new materials have different roles in the field of metal processing. They have their own characteristics and application advantages.
Ordinary cast iron is a traditional rolls material
- Material composition: Ordinary cast iron is mainly composed of iron and carbon, with a carbon content of about 2.5% to 3.5%, and usually contains a small amount of silicon, manganese and other elements.
Features
- Good castability: Ordinary cast iron has excellent fluidity and castability, is easy to cast, and is suitable for roll manufacturing of various shapes and sizes.
- Low cost: Compared with other roll materials, the raw material cost of ordinary cast iron is low, the manufacturing process is relatively simple, and the cost is more economical.
- General surface hardness: The surface of ordinary cast iron rolls usually has a certain hardness, but the wear resistance and heat resistance are relatively low.
Application scenario
- General rolling requirements are not high scene: ordinary cast iron rolls are suitable for general rolling requirements are not high scene, such as laminated sheet mill, wire mill and other small and medium-sized metal processing equipment.
- Low load, low speed rolling conditions: Because the wear resistance and heat resistance of ordinary cast iron are relatively low, it is more suitable for use under low load and low speed rolling conditions.
- Although ordinary cast iron rolls have certain application advantages in some light metal processing equipment, their performance is often unable to meet the requirements under harsh rolling conditions such as high load, high speed and high temperature. Thus, in some scenarios where there are high product quality requirements, we limit the application of ordinary cast iron rolls and use higher-performance roll materials more widely.
We develop the new roll material, which is a kind of roll material with excellent performance, through innovating the material composition and manufacturing process to aim at the limitation and deficiency of traditional roll material. The following are several common new roll materials.
High nichrome infinite chilled composite cast iron
- Material composition: contains a high proportion of nickel, chromium and other alloying elements.
- Features: Using high chromium white wear-resistant cast iron, we make the roll surface. make the inner core by using ductile cast iron.
- Application: Suitable for high load, high temperature and high speed rolling conditions, often used in finishing rolling equipment.
High chromium rolls
- Material composition: The surface of the roll is made of high chromium white wear-resistant cast iron. It has high chromium content. And the inner core is made of ductile cast iron.
- Features: Excellent wear resistance and heat resistance, suitable for high temperature and high load rolling conditions.
- Application：People often use it in heavy metal processing equipment like large blooming mill, section mill, and bar joint mill.
Alloy ductile iron
- Material composition: The whole roll is made of ductile iron, and the graphite is uniformly spherical distribution.
- Features: high tensile strength and wear resistance, suitable for heavy load and high speed rolling conditions.
- Application: It is usually applied in heavy metal processing equipment, including large blooming mill, section mill, and bar joint mill.
- These new roll materials have better wear resistance, heat resistance and corrosion resistance.
- High Ni-Cr infinite chilled composite cast iron is a new type of roll material with the following characteristics and advantages
- Material composition: high Ni-Cr infinite chilled composite cast iron contains a high proportion of nickel, chromium and other alloying elements, as well as an appropriate amount of carbon and other elements.
Excellent performance
- Wear resistance: The addition of high nickel chromium alloy makes the roll have excellent wear resistance, and can maintain long-term wear resistance under high load，and high speed rolling conditions.
- Heat resistance: The addition of composite structure and alloying elements improves the heat resistance of the roll, so that it can work stably in high temperature environment, reducing deformation and damage caused by high temperature.
- Corrosion resistance: Alloying elements add to enhance.
People use high chromium white wear-resistant cast iron which has high chromium content to make the roller surface of high chromium composite cast iron, and use ductile cast iron to make the inner core to form a composite structure.
Excellent performance of rolls
- Wear resistance: The surface of high chromium cast iron contains massive and granular carbides, which makes it have excellent wear resistance and can maintain long-term wear resistance under high load and high speed rolling conditions.
- Alloy ductile iron is a new type of roll material, with the following characteristics and advantages:
- Material composition: The roller of alloy nodular cast iron adopts nodular cast iron as a whole, and the graphite is uniformly spherical distribution, while adding a certain proportion of alloying elements, such as chromium, nickel, etc., to improve its performance.
Excellent performance
- High tensile strength: Due to the spherical distribution of graphite in ductile iron, the alloy has a high tensile strength. It can withstand larger loads.
- Excellent wear resistance: The addition of alloying elements, as well as the improvement of graphite form, Make alloy ductile iron possess good wear resistance. And make it be able to maintain stable surface quality during a long rolling process.
- Good heat resistance: The addition of alloying elements improves the roll’s heat resistance.It enables the roll to work stably under high temperature conditions through the addition of alloying elements.
- Extensive application: Someone frequently uses alloy ductile iron rolls in heavy metal processing equipment like large blooming mills, section mills, and bar continuous mills to enhance the service life and stability of the roll.
Through reasonable composition design and manufacturing process, these new roll materials can overcome some limitations of traditional roll materials, have better wear resistance, heat resistance and corrosion resistance, can meet higher requirements of rolling conditions, improve product quality and processing efficiency. Therefore, We have widely used and promoted it in the metal processing industry.