Flux-cored wire for building up cold-rolling middle roller working layer and preparation method thereof

Abstract

The invention relates to a bead welding flux-cored welding wire of a working layer of a cold mill intermediate roll and belongs to field of welding materials. The invention solves a technical problem of providing a beading welding flux-cored welding wire for repairing a working layer of a cold mill intermediate roll. The bead welding metal of the welding wire has better hardness, strength and anti-fatigue capacity. The flux-cored welding wire comprises the following chemical components in percentage by weight: 0.50 to 0.70 percent of C, 0.60 to 1.10 percent of Si, 0.75 to 1.10 percent of Mn, 3.5 to 5.5 percent of Cr, 0.6 to 1.2 percent of Ni, 0.4 to 1.7 percent of Mo, 0.30 to 0.80 percent of V, 0.03 to 0.10 percent of Nb, 0.01 to 0.025 percent of Ti, 0.80 to 2.50 percent of W, 0.05 to 0.50 percent of Re, less than or equal to 0.035 percent of S, less than or equal to 0.035 percent of P and the balance of Fe and inevitable impurities. The total percentage of the components is 100 percent.

Description

technical field [0001] The invention relates to a flux-cored welding wire for surfacing welding of a working layer of a cold-rolled intermediate roll and a preparation method thereof, belonging to the field of welding materials. Background technique [0002] The cold-rolled intermediate roll is a key component required for the production of cold-rolled steel plates. It bears a large alternating stress during work, and the hardness of the roll body reaches HRC54-59. It also requires better anti-stripping ability. Therefore, the current Manufacturers generally use high-carbon low-alloy steel such as 9Cr3Mo through forging and complicated heat treatment processes, which are expensive. The annual consumption of cold-rolled intermediate rolls in our country is very large, and its repair is also very difficult, so most of the damaged cold-rolled intermediate rolls are scrapped without repairing, resulting in huge economic losses. [0003] The repair of cold-rolled intermediate ro...

AI Technical Summary

Problems solved by technology

Cold-rolled intermediate rolls are subject to high rolling pressure and fatigue stress during use. They need to have good hardness, strength and fatigue resistance. The existing working layer welding wire for cold-rolled intermediate roll repair The hardness can meet the requirements, but the toughness cannot meet the requirements, the fatigue resistance is poor during use, and it is easy to produce blocks and cracks