Our trailer turntable is based on JT/T651-2006 standard and bring inadvanced technics abroad.There is no quenching treatment in traditional turntable and the life is short because it is easy to wear. In order to improve the wearing quality, We do quenching treatment in the raceway.The quenching hardness will be more than HRC40. That mean our product improve the quality from loading, wearinglessness and life.