Material & heat treatment & surfacing coating
Quality of raw material is one of the most critical factors to ensure an enhanced bearing life.
NBI improves rolling contact fatigue life with:
- Enhanced cleanliness. Inclusions size and quantity closely controlled by restricting the chemical composition. Narrower carbides threshold.
- Selection of through hardening steel type according to the rings’ and rollers’ thickness and improved heat treatment to achieve a better microstructure and hardness uniformity on the functional section.
NBI approaches this critical issue with a very experienced own team, working in close cooperation with some of the best Spanish technological centers. With the aim of developing and defining.
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Raw material standards
Steel, brass, polyamide, and others.
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Quality control inspection procedure throughout the whole bearing manufacturing process
Purchase of steel, rings’ and rollers’ forging, annealing and heat treatment, cages’ surface coating.
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The latest state-of-the-art heat treatment technology and equipment
NBI is equipped with an Aichelin salt heat treatment furnace in the Chinese factory. NBI plans to install a heat treatment line in its Indian bearing plant by 2021 and in its Spanish plant by 2022.
![Aichelin heath treatment Aichelin heath treatment](https://gruponbi.com/wp-content/uploads/aichelin-heath-treatment.jpg)
The most advanced heat treatment recipes according to each specific application requirements.
- Martensitic hardening: high hardness.
- Bainitic hardening: strength to resist fracture and absorb shocks.
- Case hardening: can endure heavy shocks loads.
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Surface coating standards according to each specific application requirements
- Zinc coating: to minimize corrosion.
- Black oxide: for running-in and under poor lubrication.
- Hard chromium: to resist corrosion, wear and friction.
- PTFE: for starting up and to reduce stick-slip phenomenon.
- DLC: for high mechanical strength, reduced wear and optimal friction properties.
- Nitriding / Nitrocarburizing: increases the resistance against fatigue, wear and corrosion.
![Surface coating Surface coating](https://gruponbi.com/wp-content/uploads/Surface-coating.jpg)
The most suitable equipment for NBI’s metallographic laboratory
Each factory has its own fully equipped laboratory.
![The most suitable The most suitable](https://gruponbi.com/wp-content/uploads/The-most-suitable.jpg)