In a rough rolling mill

when the 650 roller contacts with the surface of the rolled material at a high temperature

the roller surface may crack and roller pass may wear due to the combined action of working pressure

impact

wear and thermal cycle. Thus

the roller should be replaced timely. The repair technologies of submerged-arc welding and surfacing are widely used to repair the replaced roller.The repaired roller must satisfy the use requirements

namely the roller surface must have high hardness and high temperature wear resistance

so it is very important to select welding materials and develop a reasonable welding technology.