Research on Medium-frequency Induction Heat Treatment of Seamless Dual Phase Steel Tube

The seamless steel tube in the dual phase steel containing ferrite and martensite as base structure is developed by means of getting the hot-rolled Q345B seamless steel tube with initial structure composed of ferrite and pearlite processed with the medium-frequency induction heat treatment. And then,the dual phase steel tube is further subjected to the circular processing to get ultra-fine grain base structure of it. Described here are the major aspects of the said medium-frequency induction heat treatment process for the dual phase steel tube,including the process de- sign,testing of the heat treatment process and the result. The research result leads to the conclusion that it is quite practical to use the medium-frequency induction quench process for developing the seamless dual phase steel tube.