Zibo Najie International Trade Co.,Ltd.
Converging excellence, triumphing together
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Bar and wire rod mills are the toughest proving grounds for industrial bearings. From the violent shock loads in the roughing stands to the high speeds and scale dust in the finishing blocks, bearings are subjected to a brutal combination of forces, heat, and contamination. Standard bearings fail prematurely, causing unplanned downtime that costs thousands per minute. Our bearings are engineered from the outset to not just survive, but thrive in these conditions, delivering maximum uptime and lower cost per ton.
We provide robust bearing solutions for every stand of your mill:
· Roughing & Intermediate Stands: Our four-row tapered roller bearings are the workhorses, designed with forged brass cages and case-carburized steel to absorb massive shock loads and resist cracking. They provide the rigid support needed for large reductions.
· Pre-finishing & Finishing Stands: For high-speed applications, we offer precision-balanced bearings with optimized profiles to reduce heat generation and prevent smearing. Advanced labyrinth seals with multi-point grease injection are critical here to expel water and scale while retaining lubricant.
· General Purpose: Sealed spherical roller bearings are used in guides, tables, and other auxiliary equipment where misalignment is a concern.
The biggest enemy in a hot mill is water and scale ingress. Our sealing systems are specifically designed for this:
· Water-Tight Labyrinth Seals: Create a tortuous path to block pressurized cooling water.
· Grease Purge Systems: Positive-pressure grease fittings allow you to actively force contaminants out, creating a barrier against invasion.
· Special Coatings: Black oxide coatings provide an extra layer of protection against corrosion during mill downtime.
· Extreme Shock Load Capacity: Robust design, case-carburized material, and forged cages prevent brittle fracture under heavy impacts.
· Massive Load Capacity: Multi-row roller designs handle the immense rolling forces required for reducing billets into bars and rods.
· Superior Sealing: Advanced labyrinth and contact seal combinations effectively exclude water, scale, and oxides, the primary causes of bearing failure.
· High-Temperature Stability: Special heat stabilization processes and high-temperature grease ensure performance in hot mill environments.
· Extended Service Life: Engineered for durability to withstand continuous punishment, reducing downtime and maintenance costs.
· Quick-Change Design: Many designs are interchangeable with major brands, facilitating faster roll changes and repairs.
· Roughing Stands: Primary and secondary roughing mills.
· Finishing Stands: Pre-finishing and finishing mill stands.
· Finishing Blocks: High-speed 45° / 75° no-twist finishing blocks for wire rod.
· Guide boxes, loopers, roller guides, table rollers.
· Transfer Tables: Bearings for aprons and conveying rollers.
· Steel Mill Experts: We specialize in bearings for ferrous metal rolling, understanding the unique challenges you face daily.
· Impact Technology: Our focus on case-carburizing and robust cage design sets us apart for roughing and intermediate mill applications.
· Sealing Solutions: We offer the most effective sealing options to combat water ingress, the number one cause of bearing failure in hot mills.
· Global Stock & Fast Delivery: We maintain stocks of popular sizes for major mill types to minimize your downtime.
· Failure Analysis Support: Our technical team can help diagnose failure root causes and recommend solutions to prevent recurrence.