Research And Application On The Surfacing Welding Technology Of The Continuous Casting Roll

It was Analyzed the different failure mode of the continuous casting roll By Theuse of continuous casting roll. The material of the continuous casting roll, selection ofwelding wire1Cr13Ni4Mo2, wire3.2mm diameter, matching agglomerated fluxSJ301,to the surfacing welding testing, By means of analysis the chemic component,optical structure and measuring the hardness, the samples with the hardface layer ofcontinuous casting roll were studied. The results show that the microstructure in heataffected zone are not the same in the continuous casting roll diameter, the grain is coarsein the smaller diameter roll, mainly containing ferrite, larger diameter of roll castingmicrostructure is mainly composed of sorbite organization; continuous casting roller ofdifferent sizes, the weld microstructure are the same, is composed of martensite and asmall amount of ferrite. At the same time as the roll diameter increases, the hardness ofeach layer corresponding to slightly increase. Continuous casting roll the same rolldiameter decreased from the first layer to the third layer hardness.For different roll diameter of roll casting size without the use of weldingparameters, the welding test after different heat treatment processes, studied the effectof different heat treatment process on the surfacing layer, the result showed that with theincrease of annealing temperature, the surface hardness of roll casting gradually reduced.The surface hardness of continuous casting roller and roller diameter small Acontinuous casting roll hardness is larger than the diameter of the small roller. As theannealing temperature from580℃to500℃, the weld microstructure consists of bainite transformation into martensite.Through the different surfacing and heat treatment processes of continuous casterroll, proved by surfacing welding roll was significantly higher than that in the new roll,the casting roll has good economic benefit.