Composite rolling of three-layer iron-based metals of 25Cr5MoA steel/micro-alloyed steel/Q235 steel

Clad plates of 25Cr5MoA steel/micro-alloyed steel/Q235 steel were prepared with composite slabs heated to the rolling temperature between 950℃ and 1 100℃, held at each temperature for some time, and then rolled one pass under the reduction between 50% and 65%. The interfacial bonding strength was measured by shearing testing and the interfacial metallographic microstructures were observed by optical microscope. The results show that the rolling temperature between 950℃ and 1 100℃ is favorable to the bonding of the steels. Pass reduction has effect on the bonding strength, and after the pass reduction reaches some value the bonding strength degrades with increasing pass reduction. Rolling temperature is crucial to the bonding strength, and as the temperature rising, the bonding strength increases gradually under the same reduction. The bonding strength reaches the maximum value at a rolling temperature of 1 100℃ and a pass reduction of 50%.