Built up welding technique of restoring roller for shape bar

Abstract

A build-up welding technology for repairing the rolling roller of section includes such steps as pre-turning, defect inspection, pre-heating, welding transition layer with flux-cored wire SN-YD1031 and flux SSF, welding working layer with flux-cored wire SN-YD285 and flux HJ107, heat treating, turning, and inspection.

Description

technical field [0001] The invention belongs to the technical field of surfacing welding, and relates to a surfacing welding repairing process for rolls of the second rolling mill of a universal production line of a steel rolling enterprise, in particular to a surfacing welding repairing process for profile rolls. Background technique [0002] Rolls are key spare parts for steel rolling enterprises. The rolls (commonly known as BD2 rolls) of the second rolling mill of Panzhihua Iron and Steel Universal Production Line are made of 60CrNiMo, and the diameter of the roll body is φ1090, φ1320, φ1340, φ1350 and other specifications according to the type of rolled steel products, and can be rolled up to 75Kg. / m, 60Kg / m, 50Kg / m, 43Kg / m heavy rail and 300*175H, 200*200H, 250*250H, 300*200H steel and other profiles, the roll body bears huge high-speed alternating rolling pressure during work, The square steel is basically formed after passing through this rolling mill. During rollin...

AI Technical Summary

Problems solved by technology

The production of BD2 rolls requires steelmaking, forging, normalizing and other processing processes. The production cycle is long, the one-time occupation of capital is large, and the manufacturing cost is expensive. A pair of rolls is worth about 1.5 million yuan. If they are scrapped normally, they will not be repaired. , will cause huge economic losses to metallurgical enterprises