Quality Requirement and Rolling Production of High Carbon Chromium Bearing Steel

High-Carbon Chromium Bearing Steel Quality Requirements and Rolling Production

High-carbon chromium bearing steel is one of the main types of bearing materials, and it is also the preferred material of rolling bearing rings and rolling elements due to its good high temperature wear resistance and high fatigue strength. The quality requirements and rolling production of high-carbon chromium bearing steel are very important for the manufacturer and user.

In order to meet the quality requirements of high-carbon chromium bearing steel, the manufacturer needs to pay attention to the chemical composition. Some elements like carbon and chromium should have higher content requirements because they have significant impact on the performance of high-carbon chromium bearing steel. Except those elements, other elements such as Si, Mn, P and S are also important factors. The carbon content should be controlled around 0.50%-1.12%, while the chromium content should be controlled around 1.25%-2.25%.

In the rolling production of high-carbon chromium bearing steel, it is necessary to pay attention to the cooling condition. The correct cooling cycle should be chosen for different kinds of bearing steel to avoid abnormality. And the control of deformation degree, which is an important factor in bearing steel production, should be accurate to guarantee the uniformity of geometry size and the rationality of metallographic structure, then the performance of the bearing steel will be improved.

At the same time, the quality of high-carbon chromium bearing steel can also be ensured by advanced production technology. Under the condition of different rolling stages, such as finishing, semi-finishing and roughing, it is necessary to use different production process parameters according to the technical requirements. And the pollution problem of high-carbon chromium bearing steel must be strictly prevented to ensure the cleanliness of the steel surface or the inner surface.

In conclusion, the quality control of high-carbon chromium bearing steel is very important for the manufacturer and user. The correct choice of chemical composition and processing parameters is the basis for assuring the quality of bearing steel. Advanced rolling production technology and strict pollution control can also ensure the quality of bearing steel. Therefore, the manufacturer and user should pay enough attention to the quality control of high-carbon chromium bearing steel.

High-carbon chromium bearing steel is a kind of bearing material steel used in the production of bearings. It has good comprehensive performance, such as high strength, good fatigue resistance, moderate toughness and good hardenability. It is mainly used to manufacture rolling bearings and other high-load and high-speed rotating machine components.The quality requirements of high-carbon chromium bearing steel are mainly reflected in the following aspects:

1.Good chemical composition: In order to obtain good machinability, bearing steel should have higher C content and suitable Mn, Cr, Mo, etc. content.

2. Appropriate size and uniformity: The size and uniformity of bearing steel directly affect the shape and size precision of finished products.

3. Good surface quality: The surface of bearing steel must be clean, without scratches and bumps, and has certain brightness.

4.Good metallographic structure: The metallographic structure of bearing steel should be fine and uniform,without coarse grains, smears and segregation.

5. High cleanliness: Bearing steel should have low oxygen content, inclusions and carbides, oxidation and sulfide content, etc.

In order to produce high-carbon chromium bearing steel with the above quality requirements, the following measures should be taken in rolling production:

1. Firstly, increase the temperature difference in the furnace, store the heat energy, so that the temperature of the bearing steel decreases as slowly as possible.

2.Establish an effective cooling system and take a scientific cooling process.

3. Rationally determine the deformation force, reduce the hexahedral deformation, and control the deformation rate.

4. Strictly control the parameters of rolling process, such as rolling speed and rolling pressure.

5. Improve the level of technological equipment and optimize the technology system.

By implementing the above measures, high-carbon chromium bearing steel can meet the quality requirements and improve the yield and product quality.