Support seat is the key and important part of railway freight car bogie.Support products are widely used in the world casting process.In recent years,with the improvement of railway transportation demands for overloading,high-speed,the key part of turning performance requirements are improved,the inherent defects of cast steel brackets product(on the mechanical properties of the steel itself,fatigue toughness,impact resistant performance is not high,the casting products are inevitably exist porosity,shrinkage,inclusions,cracks,etc.)pose a threat to the safe operation of the high-speed railway has.To improve the comprehensive mechanical performance of the support products is a major issue that China ministry of railways needs to solve in order to solve the major reform and structural adjustment of railway transportation,implement the development technology of heavy load,speed and safety,and improve the transportation efficiency and efficiency.