Slewing Ring Forgings

Description

Forged Rings for Slewing Ring Bearing Manufacturing

Slewing ring forgings are seamless rolled rings used as the base structure for slewing ring bearing assemblies. In heavy equipment, the slewing ring connects two structural components and allows controlled rotation while carrying axial load, radial load and overturning moment at the same time.

Because a slewing ring bearing often works under continuous load and low-speed rotation, the structural integrity of the forged ring is critical. Compared with cast rings or fabricated structures, forged slewing rings have a more uniform internal structure and better grain continuity, which improves fatigue resistance and long-term reliability.

We supply slewing ring forgings in three main delivery conditions:

Forging blanks for further machining

Semi-machined rings

Fully machined rings including raceways and bolt holes

Customers can choose the supply stage according to their production process.

Manufacturing Process of Slewing Ring Forgings

The production of slewing ring forgings begins with billet inspection and chemical composition verification. After controlled heating, the material undergoes open-die forging and radial-axial ring rolling. During this process, the metal flow follows the circular contour of the ring, which helps reduce internal defects and improve mechanical performance.

After forming, the rings are heat treated according to the specified material grade. Depending on application requirements, we provide:

Normalizing

Quenching and tempering

Surface hardening or carburizing

For customers who require finished slewing ring bearings, we also provide machining services including raceway turning, gear cutting, drilling of mounting holes and surface finishing. Critical dimensions can be controlled within tight tolerances where required.

Material Selection for Slew Ring Bearing Applications

Material choice depends on load level, working environment and service life requirements.

Common materials include:

50Mn / S48C (AISI 1050)
Used for standard slewing ring applications with moderate load conditions.

C45 / AISI 1045
Suitable for general industrial slew ring bearings.

42CrMo / 42CrMo4 (AISI 4140 / SCM440)
Widely used in crane slew ring systems and wind turbine yaw bearings due to higher strength and better fatigue resistance.

20CrMnTi
Used when case hardening is required to improve raceway wear resistance.

18CrNiMo7-6
Applied in heavy-duty roller bearing slewing ring structures where high surface hardness and core toughness are both necessary.

For marine or corrosive environments, stainless steel grades can be supplied upon request.

Applications of Slewing Ring Forgings

Slewing ring forgings are used in equipment that requires large-diameter rotational support.

In construction machinery, crane slew ring systems rely on stable slewing ring bearings to support lifting loads and rotation. Excavators and other tracked equipment also use slew ring bearings as key structural components.

In wind power generation, slewing ring bearings are installed in yaw and pitch systems. These applications require consistent load distribution and long service life under variable environmental conditions.

Mining equipment, bulk material handling systems, industrial turntables and heavy rotating platforms also use roller bearing slewing ring assemblies. In these applications, the forging quality has a direct impact on bearing life and operational stability.

Bearing Types Supported

Our slewing ring forgings are suitable for manufacturing different bearing structures, including:

Four-point contact ball slewing ring bearings

Crossed cylindrical roller bearing slewing rings

Three-row roller slewing ring bearings

Double-row ball slew ring bearings

The final bearing performance depends not only on machining accuracy but also on the internal quality of the forged ring.

Size Range and Custom Manufacturing

We manufacture slewing ring forgings in a wide dimensional range:

Outside diameter from 500 mm to 4,500 mm

Larger diameters available upon request

Wall thickness from 60 mm to 600 mm

Unit weight up to 12,000 kg

All rings can be produced according to customer drawings and technical specifications.

Quality Control

Each slewing ring forging can be tested according to project requirements. Inspection methods include:

Ultrasonic testing

Magnetic particle testing

Mechanical property testing

Hardness testing after heat treatment

Dimensional inspection reports

These inspections are performed to ensure the forging meets structural and mechanical requirements before delivery.

Technical Support

For customers manufacturing slewing ring bearings or complete slew ring bearing assemblies, we can provide support in material selection and heat treatment planning based on application load and working conditions.

If you are sourcing slewing ring forgings for crane slew ring systems, wind turbine yaw bearings, or heavy-duty roller bearing slewing ring applications, feel free to share your drawings and specifications for review.