ZZ Bearings Launches High-Temperature-Resistant Special Slewing Bearings

2023-02-15

In high-temperature industrial environments—such as metallurgical continuous casting operations, glass manufacturing, and cement kilns—equipment is frequently exposed to ambient temperatures of 200°C or even higher for extended periods. Under such operating conditions, standard slewing bearings often suffer from frequent failures caused by material annealing (leading to reduced hardness), cage deformation and jamming, or lubricant breakdown; these issues severely disrupt production continuity. To address this specific challenge, ZZ Bearings' Special Materials Laboratory dedicated two years to research and development, successfully launching a specialized, high-temperature-resistant slewing bearing capable of operating at temperatures up to 250°C.

The core technological breakthrough of this product lies in the restructuring of its material system. The raceways and rolling elements are fabricated from heat-resistant steel alloyed with elements such as molybdenum and tungsten. These components undergo a specialized stabilization treatment to ensure that they can operate continuously at 250°C without experiencing dimensional changes or a decline in hardness. The bearing cages are constructed from either high-temperature-resistant engineering plastics or copper alloys, thereby eliminating the risk of brittle fracture under high heat. Crucially, ZZ collaborated with a renowned lubricant manufacturer to develop a specialized high-temperature, complex lithium-based grease; with a dropping point exceeding 300°C, this lubricant maintains a stable oil film even under extreme heat.

In a continuous casting machine retrofit project undertaken by a major steel conglomerate, the original imported bearings required replacement every three months, resulting in substantial downtime losses. Following the installation of ZZ's high-temperature-resistant slewing bearings, the equipment has operated continuously and stably for over six months without a single anomaly. On-site monitoring data indicates that, within high-temperature zones, the service life of the new bearings is more than three times longer than that of standard products, while maintenance intervals have been significantly extended. This success story not only demonstrates ZZ Bearings' capability to provide effective solutions for extreme operating conditions but also offers the high-temperature industrial sector a cost-effective, domestically produced option for equipment upgrades and retrofits.

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