Four-row cylindrical roller bearings are mostly used in steel mill industry. ESG Bearing is using our experience, technology, expertise and commitment of quality to make the most suitable bearings for rolling mills.

Four row cylindrical roller bearings are mainly used in cold/hot rolling mill,bloomer and other steel rolling mill machines.The bearing structure is separate structure. The bearing rings and rollers can be separated easily. So it is convenient for bearing cleaning, checking, mounting and unmounting jobs.

FC model bearing is consist of two outer rings and one inner ring. On the both sides of outer rings, there are blocker,middle blocker on the middle of the blocker. There is no blocker on the inner rings.

FCD model bearings consist of two pieces of NN model bearings..

FC model and FCD model bearings can allow the axial movement within the axis base to two directions. So, this kind of bearing are suitable for movable end bearings.

As critical roller bearing of rolling mill, the spare parts of four row cylindrical roller bearings can be replaced, installed, dismounted and cleaned easily. Within the radial installation area, it can provide max. radial loading ability with lower friction factor.

 

There are three kinds of structure type: FC type, FCD type and FCDP type.

FC Type

It belongs to separable bearings that inner ring can be seperated from the whole bearings. It has better limit rotation speed and can be interchangable. Protection cage can be brass or steel cages.

FCD Type

It belongs to separable bearing. However FCDP type will be much convenient than FCD type for separable degree. For FCD type, it can only make two inner rings separate from the whole bearing with higher limit rotation speed and interchangable feature. Protection cage can be brass or steel cages.

 

FCDP Type

It is critical roller bearing. The spare parts can be separable with high precision. It is very convenient to install, dismount and clean. Within installation area, it can provide max. radial load ability with lower friction factor. So it is applied in high speed, heavy load and terible working environment of rolling mill production.

 

The inner ring and roller neck of four row cylindrical roller bearing should be interference fit. When installed, it should be heated to 80 ~ 90 ℃ and the temperature should not exceed 100 ℃. Otherwise, it is easy to cause annealing of bearing ring raceway and roller, affect hardness and wear resistance, and lead to bearing life reduction and premature scrapping. After the bearing is installed on the shaft, the inner ring must be pressed down immediately until it cools down. It is usually heated by induction heater, and it is forbidden to use cutting gun to bake. When the inner ring is installed on the roll neck, it is in close contact with the water retaining ring to prevent the water retaining ring from moving.

Our（ESG Bearings） four row Cylindrical Roller Bearing product awarded with national patent. All products awarded the ISO9001 quality management system certification for many times.

At ESG Bearing, we are dedicated to enhancing efficiency and driving down costs for rolling mills across the industry. Our latest shipment marks another milestone in our journey to provide top-notch solutions that keep the wheels of industry turning smoothly.

Delivering Excellence

In our recent collaboration with a leading steel mill group, we successfully delivered a large shipment of essential rolling mill bearings. This partnership underscores our commitment to supporting the rolling mill industry with reliable and efficient logistics solutions. Each delivery is a testament to our precision, dedication, and the trust our clients place in us.

Innovation at the Core

ESG Bearing continuously innovates our methods and technologies to stay ahead in the industry. From state-of-the-art tracking systems to streamlined delivery processes, we ensure that every step is executed with utmost precision. This commitment to innovation translates into tangible benefits for our clients, allowing them to focus on their core operations while we handle the logistics.

At ESG Bearing, we believe that efficiency and cost-effectiveness are the cornerstones of a successful rolling mill industry. Our latest delivery is just one example of how we strive to make a positive impact. We look forward to continuing our journey, driving innovation, and supporting the industry with unmatched dedication and expertise.

Generally speaking, the rolling mill stands will have 2 rolls, 3 rolls, 4 rolls, or a set of multiple rolls mounted onto the stands.  The loads on the rolls will transfer to the roll neck bearings and their housings during the rolling of steels. The roll neck bearings are to meet the basic need of the smooth rolling of steel products. They will differ from sizes, carrying capacities and other aspects, due to different requirements and working conditions. Therefore, they will have different configurations and speeds of rolling.

The bearings are designed to withstand high loads, impacts, varying speeds and high temperature. They also need to work with metal particles, dirt, and water. Therefore, the bearings should be made with good material and technique to endure the toughest working conditions. Roll neck bearings with high quality will help steel mills reduce a lot for reducing power consumption, downtime, and improving rolling conditions.

With best bearing material choosing, and strict control on processing, ESG Bearing is able to meet most modern steel mills’ high requirements. ESG Bearing is also the only 1 factory bearing manufacturers having 100% flaw detection on the bearings. Thus the bearing quality will be assured.

Steel metal rolling operations usually deform the materials by compressive forces between two constantly spinning rolls. These forces act to reduce the thickness of the metal and change its grain structure. Besides, the rolls will also feed the material when they are spinning to each other.

However, the rolls cannot function in isolation. During the rolling process, rolls, stands, bearings, housings, and motors are necessary parts for the operation. Usually, bearings will transmit motion and forces. They are usually mounted on the rolls and inserted into the housings. This is why the bearings on the mill stands are called roll neck bearings. These bearings should be strong enough to face with extreme temperatures, dust, contaminants, and variable humidity. They will also work under physical stresses of continuous high speed, extreme torque and shock loads.

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.