There are lots of categories of metallurgical equipment, which includes equipment required for raw material plant and equipment required for steelmaking process, steel rolling process, leveling process, and other upstream processes and downstream processes. All of equipment are provided with various bearings which are used in characteristic “iron powder”, “water”, and “hot” working conditions, satisfy using conditions of “heavy load+ vibration shock” and “from ultra-low speed to high speed+ sharp acceleration and deceleration”, and are used in extremely poor working conditions. “Stable operation and production efficiency improvement” is a representative industrial proposition in metallurgical equipment field. YFB has various bearings required by metallurgical equipment with lots of products. In addition, aiming at requirements of metallurgical industry for high value added products and environmental protection products, corresponding measures are taken; new solution is provided.