Renovation technique for phi2100í‡3400mm wrought steel support roll

Abstract

The invention relates to the technical field for repairing an ultra-large type backup roll, in particular to a repair process of a forging steel backup roll with Phi2100* 3400mm. Firstly, welding is carried out on the rib of the backup roll: the roll body of the backup roll which needs to be welded is preheated to 250 DEG C, and the temperature is preserved for 10 hours; then the door of a furnace is opened, rib welding is carried out, zigzag welding is carried out every 100mm, and the length of the weld pass is 50-60mm; oxygen is used on the welded part immediately, and ethyne is used for warming the welded part until the welded part becomes blue. After the rib welding is finished, preheating treatment, temperature preservation treatment and destressing treatment are carried out respectively according to a heat treatment curve when the roll body of the backup roll is overlaid for making a bottom layer, a transition layer and a working layer. Compared with the prior art, in the technology of the invention, the influence on the service performance caused by the temperature circulation and change of a heat influencing region during the overlaying is considered, uniformity and penetration of preheating workpieces and uniformity of temperature between layers are guaranteed in the repair process, the blank in the repair rebirth field of the domestic ultra-large type backup roll is filled in. The time for repair is short, the service life is prolonged, and the cost is saved.

Description

[technical field] [0001] The invention relates to the technical field of repairing super-large backup rolls, in particular to a repairing process for φ2100×3400mm forged steel backup rolls. [Background technique] [0002] The wear and corrosion caused by the operation of industrial machinery and equipment under different media conditions is of course a major issue that cannot be ignored in the world's industrial production. According to statistics, the loss caused by wear and corrosion of equipment and components in industrially developed countries is almost 7%-10% of the gross national product. The use of hard surface materials and hard surface technology can effectively prevent the wear and corrosion of equipment and components. , and the damaged components can be repaired and regenerated, which has significant economic and social benefits for building an economical economy. [0003] Large-scale cold and hot continuous rolling mills have become the mainstream in my countr...

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Problems solved by technology

[0004] The surfacing repair of large back-up rollers has been widely used in industrially developed countries. Although my country started relatively late, it has developed rapidly in recent years. Some professional manufacturers in Liaoning, Jiangsu, Zhejiang, Shanghai, Tianjin, Hebei, Fujian and other regions and Baosteel , Anshan Iron and Steel, Xinggang and other large and medium-sized iron and steel enterprises have carried out a lot of practice and research on the technology of surfacing and repairing large hot-rolled backup rolls, including technical equipment, technological processes and surfacing materials, but there is almost no repair and regeneration of super large backup rolls. set foot in

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