The steel ball for windmill bearing is generally in the range of Φ 45-80mm bearing steel ball, which is used for yaw bearing and pitch bearing. The life of windmill bearing are required to last more than 20 years as the working environment is tough and maintenance cost is very high. Therefore,windmill bearing have strict quality requirements on steel balls.Yusion carries out standard management systems strictly according with proprietary standard regulated by international technology criterion of steel to select our raw material.And by advanced facility, top-ranking testing intruments and stringent control procedures to guarantee our windmill balls with superior quality and long life.