Frequently Asked Questions
Common inquiries about our induction-hardened work rolls, backup rolls, and heavy-duty calendar rollers for cold-reduction mills.
What is the typical hardness depth of your induction-hardened work rolls?
Our induction-hardened work rolls achieve a hardened layer depth of 8–12 mm, depending on the roll diameter and steel grade. The controlled heat-treatment process ensures a uniform case depth while maintaining core toughness for impact resistance.
How do your backup rolls improve mill stability?
Backup rolls are forged from high-alloy steel with optimized grain-flow integrity, providing the stiffness needed to support work rolls under high cyclic loads. The precise neck geometry and bearing-seat tolerances reduce deflection, helping maintain consistent gap geometry and tighter gauge control.
What surface finishes are available for calendar rollers?
Calendar rollers are available with chrome plating or ceramic coating, both applied after multi-stage finishing for micro-surface uniformity. Standard surface roughness ranges from Ra 0.2 to 0.8 µm, tailored to the specific material being processed.
What is the typical lead time for a custom work roll order?
Lead time depends on the roll dimensions, steel grade, and heat-treatment requirements. Standard work rolls typically ship within 8–12 weeks from order confirmation. Custom backup rolls or calendar rollers may require 12–16 weeks due to forging and inspection steps.
Do you provide ultrasonic inspection for all rolls?
Yes, every roll undergoes ultrasonic inspection to detect internal defects such as inclusions or cracks. This is part of our standard quality assurance process, and we can provide inspection reports upon request.
Can your rolls be reconditioned after service?
Yes, we offer reconditioning services including regrinding, re-hardening, and surface coating restoration. The feasibility depends on the remaining case depth and core condition. Contact our service team with the roll serial number for a detailed assessment.