cast steel hinged joint  is made of ZG270-500, 35CrMo or 35SiMn.Our company is a professional manufacturer,which is the 20th in cast steel field in China .we have full exported experence ,which is exported to Germany/Korea/India,etc.It is exported to germany about 1000ton per year .It is also examined by NDT,such ultrasonic inspection ,magnetic powder inspection and penetrant inspection .MOQ is 1 ton per piece.