Rolling Mill Bearing Chock

Rolling Mill Bearing Chock

A rolling mill bearing chock, also known as a roll chock or mill bearing housing, is a critical structural component in rolling mill work stands that houses and supports the roller neck and rolling bearings. As the core load-bearing part of the rolling mill equipment, bearing chocks transmit rolling force from the rolls to the mill stand frame, while maintaining the precise position and running stability of the rolls during metal rolling processes in hot and cold rolling operations.
BOPENG is specialize in producing durable, precision-engineered cast steel bearing chocks suitable for various types of rolling mills, including hot strip mills, cold rolling mills, and plate mills.

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Main Function

The roller bearing chock serves as a robust housing for the roll bearings. It ensures that the roll shafts remain in precise alignment during rolling operations. Key functions include: Load Support: Withstands axial and radial loads from the rolling process. Alignment: Maintains precise positioning of the roll shafts for uniform thickness and surface finish. Vibration Damping: Reduces noise and mechanical stress during high-speed rolling. Lubrication Management: Integrates channels for oil or grease lubrication to minimize wear.

Technical Specifications

Parameter

Capability

Material

ZG20SiMn, ZG270-500, ZG35CrMo, Stainless Steel, and other customized metal alloy material

Weight

5 tons – 150 tons (support larger customized products)

Gear Accuracy

Up to GB/T 10095-2008 Class 6

Surface Roughness

Ra ≤ 0.8μm (bearing installation surface)

Sulphur Content

Control ≤ 0.015% (far below industry standard)

Phosphorus Content

Control ≤ 0.025%

Internal Compactness

≥ 99.2%

Non-destructive Testing

100% full coverage ultrasonic testing, magnetic particle testing
BOPENG can produce rolling mill bearing chocks according to your drawings, and also provide professional design optimization services based on your working conditions.

Main Structure of Rolling Mill Bearing Chock

BOPENG provides fully custom rolling mill bearing chocks, supporting all specifications from small to extra-heavy. A standard rolling mill bearing chock consists of the following core parts:
Outer Housing

The main load-bearing structure, usually made of solid cast steel, with a reinforcing rib design to improve the overall rigidity and reduce stress concentration.

Bearing Mounting Bore

The core working part, requiring extremely high dimensional accuracy and surface quality, matches the outer diameter of the rolling bearing to ensure a tight fit and no looseness during operation.

Sealing Structure

BOPENG provide two common sealing solutions:
Oil Seal: Rubber or polyurethane oil seal, suitable for conventional working conditions, low cost, and easy replacement
Labyrinth Seal: Multi-channel zigzag sealing structure, suitable for harsh environments with a large amount of water and oxide scale, provides excellent sealing performance

Fixing System

Bolt fixing holes for conventional installation, or customized embedded structure according to equipment requirements, to meet the needs of different mill stand designs.

Lubrication System

Precisely machined lubricating oil grooves and oil passages to ensure continuous and sufficient lubrication of the bearing, reduce the friction coefficient and operating temperature.

Why Choose BOPENG Cast Steel Rolling Mill Bearing Chock?

As a professional cast steel component manufacturer, BOPENG rolling mill bearing chocks have outstanding advantages that are recognized by global customers:
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Higher Strength, Longer Service Life

– Optimized alloy steel material formula, the tensile strength reaches 800-1000MPa and hardness HRC28-32.
– Through finite element optimization design, the stress concentration is reduced by more than 40%, and the service life is 2-3 times that of ordinary cast steel bearing chocks.
– For heavy-duty working conditions, it can withstand a continuous impact load of thousands of tons, with stable performance, and is not easy to deform.

Higher Precision, Better Rolling Quality

– High-precision CNC machining ensures that the dimensional accuracy of the bearing mounting bore meets the design requirements.
– Optimized lubricating groove design reduces the friction coefficient to 0.08, which can save 12% of energy consumption compared with traditional products.
– Strict parallelism and position tolerance control ensure the precise position of the roll, effectively improving the dimensional accuracy of rolled products.

Full Customization, Adapt to Various Working Conditions

– Support non-standard customization of any size within 150 tons, according to your drawing production.
– Can select materials and adjust performance according to different working conditions, such as hot rolling, cold rolling, roughing, and finishing.
– Provide structural optimization services, help you reduce product weight and reduce procurement costs on the premise of ensuring performance.

Strict Quality Control, Reliable Quality

– 100% full inspection of all products, non-destructive testing coverage of 100% key parts.
– The sulfur content is controlled below 0.015%, and the phosphorus content is ≤0.025%, which is far lower than the industry standard.
– The internal compactness of the casting reaches 99.2%, and the rejection rate of internal defects is far lower than the industry average.

Rich Industry Experience, Stable Supply Capacity

– BOPENG has accumulated many years of production experience in the metallurgical rolling industry, and our products have been applied to hundreds of rolling lines around the world.
– The large production capacity of BOPENG can guarantee the delivery cycle of large, heavy castings.
– BOPENG has a professional technical team which can provide you with pre-sales design consultation and after-sales technical support.

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Industrial Applications of Rolling Mill Bearing Chock

Rolling mill bearing chocks are core components of various rolling mill equipment, and are widely used in the following fields: Metallurgical Industry: Hot rolling production line, cold rolling production line, roughing mill, finishing mill, blooming mill, strip mill, section steel rolling mill, pipe mill, etc. Non-ferrous Metal Processing: Aluminum rolling mill, copper rolling mill, foil rolling mill, and other non-ferrous metal rolling equipment. Mining Industry: Mineral processing equipment, crusher, ball mill, and other large heavy equipment bearing support. Heavy Machinery: Various large rotating machinery, press equipment, marine engineering equipment, and other special bearing support components.
BOPENG can produce rolling mill bearing chocks according to your drawings, and also provide professional design optimization services based on your working conditions.

BOPENG’s Solution for Cast Steel Products

BOPENG support fully customized large casting steel products in widely applications, including building material industry, metallurgical engineering, and mining industry. We supply one-stop solution from drawings to finished products.

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FAQ

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Steel casting and steel forging are two different manufacturing processes used to produce high-strength steel components, but they create different material structures and design advantages.
Steel forging forms metal through mechanical deformation under high pressure, which improves grain flow and is often selected for parts requiring extremely high fatigue resistance and directional strength. Steel casting, on the other hand, produces components by pouring molten steel into a precisely designed mold, allowing manufacturers to create complex geometries, large structures, and integrated components that would be difficult or impossible to manufacture through forging.
For many heavy industrial applications, steel casting provides significant advantages because it allows complex shapes, internal passages, thick sections, and customized designs while maintaining excellent strength, toughness, and wear resistance. This makes cast steel widely used for mining machinery, construction equipment, railway components, pump bodies, valve components, and power generation equipment.
The selection between casting and forging depends on factors such as component size, structural complexity, mechanical requirements, production volume, and operating environment. A professional steel casting manufacturer can help determine the most suitable process according to the actual application requirements.

Choosing the correct steel grade is one of the most important steps in designing a reliable steel casting component. The ideal material depends not only on strength requirements but also on the working environment, temperature, corrosion exposure, impact loads, and wear conditions.
Carbon steel castings are commonly selected for general industrial applications where good strength, machinability, and cost efficiency are required. Alloy steel castings are preferred for more demanding conditions because alloying elements such as chromium, nickel, molybdenum, and manganese can improve hardness, toughness, heat resistance, and wear performance.
For example, mining equipment components often require high impact resistance and abrasion resistance, while valve bodies and pump components used in energy or chemical industries may require corrosion resistance and high-temperature stability.
During material selection, engineers usually consider mechanical properties such as tensile strength, yield strength, elongation, hardness, impact toughness, and heat treatment requirements. A properly selected steel grade ensures that the casting performs reliably throughout its service life rather than simply meeting initial specifications.

Mining and heavy construction equipment operate under some of the most severe working conditions, including heavy impact, continuous vibration, abrasive materials, and extreme loading cycles. These environments require components with exceptional strength and durability.
Steel castings are widely used in these industries because they provide an excellent balance of mechanical strength, impact resistance, and design flexibility. Components such as crusher parts, excavator components, structural brackets, machine frames, and wear-resistant parts can be manufactured with complex shapes while maintaining high load-bearing capability.
Compared with other materials, steel castings can be engineered with specific alloy compositions and heat treatments to achieve improved hardness, toughness, and fatigue resistance. This makes them suitable for equipment that must operate continuously in mines, quarries, and heavy industrial environments.
The ability to produce large and complex components is another important advantage of steel casting, especially for heavy machinery where welded assemblies may introduce additional stress concentration points.

Steel casting quality depends heavily on controlling the entire manufacturing process, from melting and mold preparation to pouring, solidification, and heat treatment.
Common casting defects may include shrinkage cavities, gas porosity, inclusions, cracks, and dimensional variations. These issues usually result from factors such as improper molten steel treatment, incorrect pouring temperature, poor feeding design, uncontrolled cooling rates, or inadequate process parameters.
Professional foundries use multiple methods to reduce casting defects, including chemical composition control, simulation-assisted mold design, riser optimization, advanced melting technology, and strict inspection procedures.
Quality verification may include visual inspection, dimensional measurement, ultrasonic testing, magnetic particle testing, radiographic testing, and mechanical property testing. These inspection methods help ensure that steel castings meet customer specifications and perform safely in demanding industrial applications.

Heat treatment plays a critical role in improving the mechanical properties and long-term reliability of steel castings.
After casting, the internal structure of steel may contain residual stress and uneven microstructures caused by the cooling process. Heat treatment processes such as normalizing, annealing, quenching, and tempering help refine the grain structure, relieve internal stress, and achieve the required combination of strength, hardness, and toughness.
For heavy-duty applications, heat-treated alloy steel castings can provide significantly improved resistance against impact loads, fatigue failure, and mechanical deformation. For example, components used in mining machinery, railway equipment, and industrial processing systems often rely on carefully controlled heat treatment to achieve stable performance under continuous operation.
The correct heat treatment process depends on the steel grade, casting size, wall thickness, and final application requirements.

Custom steel castings are used across many industries where components require high strength, durability, and complex geometries.
Major application areas include mining equipment, construction machinery, oil and gas systems, power generation equipment, railway transportation, marine engineering, industrial pumps and valves, and heavy manufacturing machinery.
In the mining sector, steel castings are commonly used for wear-resistant and load-bearing components. In oil and gas applications, cast steel components are selected for their ability to withstand pressure, temperature variations, and harsh operating environments. Power generation and energy industries also rely on steel castings for critical equipment requiring high reliability.
Because steel casting allows manufacturers to create large, complex, and customized components, it remains an important manufacturing solution for industries requiring performance beyond standard fabricated parts.

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