Rolling bearings are mainly composed of high carbon chromium bearing steel.High-carbon chromium bearing steel is also called fully hardenable steel with the same inside and outside hardness. It is widely used in many industries with bigger quantity, over 80% of the total material.

1.GCr15

Feature and application：It can be applied in many industries with big quantity in Martensite and bainite quenching.

Technical specification：Effective wall thickness under 26mm，extra light and narrow series less than 16mm，Quenching and tempering hardness HRC57~62.

2.GCr15SiMn

Feature and application：it can be applied in many industrial with big-size bearings in Martensite quenching.

Technical specification：effective wall thickness thicker than 26mm，extra light and narrow series more than 16mm，quenching and tempering hardness HRC57~62.

3.GCr18Mo

Feature and application：bainite steel, used in wear resistant occasion with bainite quenching.

Technical specification：effective wall thickness within 26~48mm, extra light and narrow series less than 16mm, quenching and tempering hardness HRC57~62,bainite is more wear than martensite, better for wear resistant occasion.

ESG Bearing is an expert of rolling mill bearings. The working conditions for steel mill bearings are demanding as they will face dust, steel particles, water, heat, high speed and high temperature, almost the toughest conditions compared to other industry.

Bearing with higher hardness will be more wear-resistant, but it will easily crack. Thus the bearing's working life will be reduced.

How to  avoid this problem, most bearing manufacturers do not dare to make the bearings too hard. Their hardness is around 58~60 HRC. ESG Bearing has the advanced heat treatment technology. The tenacity of the bearing is improved by 30% compared with ordinary bearings. The hardness of the bearing is also improved by 2 HRC, reaching about 60~61 HRC. Thus the bearing is more wear-resistant and won’t easily crack out, it has a much longer working life.

Carburized bearing steel is also called semi-hardenable steel, which is soft inside and hard outside. The material has a certain degree of "elasticity" for impact resistance. It needs to be carburized and quenched, and the process is more complicated.

G20Cr2Ni4A

Features and uses: used in impact-resistant occasions, medium and large bearings, and can be deeply carburized.

Technical characteristics: The effective carburizing layer can be deeper than 2.5mm, and the surface quenching and tempering hardness is HRC58~63.

Bearing parts made of this type of steel have high hardness (hardness ≥ HRC58), certain wear resistance and high contact fatigue resistance after heat treatment processes such as carburization, quenching and tempering, and guarantee The heart has good toughness (hardness HRC33-48). This surface hardened core has the characteristics of toughness, making the carburized bearing steel particularly suitable for stable operation under conditions of large impact loads.

After carburizing and quenching, the surface retains the state of compressive stress and has good fatigue resistance. It has strong ability to bear impact load, and the surface hardened layer has micro cracks and it is not easy to expand to the inside. The surface has a higher hardness and the core hardness is lower. Compared with high carbon chromium bearing steel, it has better core impact toughness. The depth and concentration of carburization can be adjusted as required.

However, the cost of bearings made of G20CrNi4A is relatively high, and in the use of small and medium-sized bearings, their life will not be greatly improved compared with bearing steel. Therefore, only carburized steel is used for medium and large bearings.

Rolling mill bearings have to carry higher load and speed. They need to be more resistant to weariness and impact. Material takes an important role of the bearing performance. ESG Bearing selects the best mold casting steel, which contains less gas and particles, with the following features to improve the ESG bearing performance.

Better Grain Structure:Mold casting often results in a finer grain structure in the steel, which can contribute to improved mechanical properties such as strength, toughness, and wear resistance.

Higher Precision: Mold casting can provide higher precision in achieving intricate bearing designs and dimensions, especially for rolling mill applications.

Less Defects: Mold casting can lead to fewer internal defects like porosity and inclusions due to the controlled solidification process.

Better Surface Finish: Mold casting generally offers better surface finish and dimensional accuracy, which can be crucial for reducing friction and ensuring proper fitting in precision applications.

Four-row cylindrical roller bearings are essential components for steel rolling mills, as they must withstand heavy loads and operate reliably under harsh conditions. This unique design (four rows of rollers) ensures high load-carrying capacity and improved rigidity, making it an ideal choice for steel rolling mills.

Among the bearing models, bearing 313822 (280mm*390mm*220mm) is widely used in the steel mills.

One of the key benefits of the 313822 bearing for steel rolling mills is its ability to handle high speeds. Rolling mills operate at high speeds, and bearing 313822 is designed to handle high speeds without sacrificing performance or reliability. The lubrication system of the bearing will ensure proper lubrication of the rollers and raceways, even at high speeds.

Bearing 313822 is also featured with heavy carrying loads. Steel rolling mills require bearings that can handle heavy loads, while the four-row design of the bearing distributes the load evenly across all four rows of rollers, ensuring that the bearing can handle heavy loads without premature wear or failure.

In addition, four-row cylindrical roller bearing 313822 is highly durable and requires minimal maintenance. It is made from high-grade steel that has been heat-treated to improve its strength and durability. The rollers are precision-ground to ensure uniform contact with the raceways, reducing friction and wear. The bearing is also equipped with a sealing system that protects against contamination and moisture, further extending its lifespan.

Even though ESG Bearing has successfully made our rolling mill roller bearings with steel cage, brass cage is still popular among some clients. In order to make their preference and our persistence for a better performance meet, ESG Bearing has been searching and testing better brass material for our cage. And now we are proud that MISSION COMPLETE.

ESG Bearing is now able to offer our clients with a better performing brass cage, with higher antifriction and impact resistance.

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