Precision-machined cylindrical surfaces on rolling mill work rolls that support radial loads through bearing assemblies.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Runout | <0.02 mm TIR | |
| Hardness | 55-62 HRC | |
| Cylindricity | <0.01 mm | |
| Surface Finish | Ra 0.4-0.8 μm | |
| Diameter Tolerance | IT6-IT7 | |
| Maximum Load Capacity | Up to 10,000 kN radial | |
| Lubrication Requirement | Oil bath or grease-packed bearings | |
| Operating Temperature Range | -20°C to 150°C |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is used in the following industrial products
Core rotating cylinder that directly contacts and shapes hot steel during rolling
The primary cylindrical component that applies bending force to marine hull plates during the forming process.
A rotating mechanical component that transmits torque and rotation from a power source to a driven element within the Top Roll assembly.
A practical evidence checklist for RFQ preparation and supplier evaluation.
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Common causes include improper bearing fit (too tight causes thermal expansion issues, too loose causes fretting), inadequate lubrication leading to scoring, contamination from mill scale/water ingress, cyclic fatigue from overload conditions, and improper surface finish accelerating wear.
Visual inspection every 2-4 weeks, dimensional checks every 3-6 months using micrometers and roundness testers, and ultrasonic testing for subsurface cracks annually. High-production mills may require more frequent monitoring based on tonnage rolled.
Minor scoring (<0.1 mm depth) can be repaired via precision grinding and re-plating, but severe spalling, cracks, or dimensional deviation >0.5% requires complete journal replacement due to compromised structural integrity and load distribution.
Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.