NMT Ltd.
Corporate Communications Department
NMT Steel and Metallurgical Rolling Mill Bearings——Serving Global Steel Rolling with Decades of Application Experience
Focused on Metallurgical Rolling Applications
NMT has long been dedicated to the R&D and manufacturing of bearings for steel metallurgical rolling equipment. Our products are widely applied in hot rolling, cold rolling, continuous casting and various non-ferrous metal rolling production lines, with continuous operation in numerous steel mills and metallurgical equipment manufacturers worldwide.
Products and Technical Features
Four-Row Tapered Roller Bearings: Applied to work rolls and backup rolls in hot and cold rolling mills. The bearings feature precision-matched inner and outer ring assemblies, ensuring uniform load distribution across all four rows of raceways. Rollers are manufactured with logarithmic crowning to eliminate edge stress concentration. Ring wall thickness is calculated to maintain geometric accuracy under heavy-load conditions. Axial clearance is precisely set according to operating temperature to compensate for thermal expansion.
Four-Row Cylindrical Roller Bearings: Applied to mill backup rolls and continuous caster segments, primarily withstanding radial loads. Four rows of rollers are arranged in parallel, with radial load capacity 3.5-4 times that of single-row bearings. Cages are manufactured as solid brass structures, maintaining roller guidance precision under impact and vibration.
Sealing and Lubrication Systems: Configured with labyrinth seals, contact rubber seals and metal shields according to mill operating conditions. Seal materials are selected from FKM or HNBR, maintaining sealing performance under water spray and high-temperature environments. Bearings are pre-filled with specialized grease, with base oil viscosity and additive formulations matched to load, speed and temperature conditions.
Materials and Heat Treatment: Bearing rings and rolling elements are manufactured from high-purity bearing steel (GCr15 or M50) processed through vacuum degassing and electroslag remelting double refining. Through controlled-atmosphere heat treatment and surface carburizing/induction hardening, the components achieve a surface hardness of HRC60-64 while maintaining core toughness, balancing wear resistance and crack resistance under heavy loads and impact.
Application Scope
Hot rolling roughing and finishing mill roll neck bearings
Cold rolling mill work roll and backup roll bearings
Continuous caster segment bearings
Pipe mill piercing and sizing mill bearings
Sendzimir mill multi-row cylindrical roller bearings
Aluminum foil and copper strip rolling mill bearings
Mill main drive gearbox bearings
Technical Support Services
NMT provides bearing selection consultation, installation guidance, operational condition assessment and failure analysis services. Based on understanding of mill operating conditions and accumulated application data, we assist users in optimizing bearing configurations and maintenance strategies, extending bearing service life and reducing bearing cost per ton of steel.
About NMT
With decades of experience in rolling mill bearing applications, NMT products comply with ISO precision standards and metallurgical bearing manufacturing specifications. We continue to serve the global steel and non-ferrous metal processing industries with reliable product quality and professional technical services.