Surfacing welding rod of transition layer of sink roller for melted zinc bath and surfacing technique

Abstract

The invention relates to an intermediate layer of a sink roller which is used in a hot galvanizing groove; meanwhile, the invention relates to welding wires used in the surfacing of the intermediate layers of coating roller species and a surfacing method thereof. A surfacing welding wire of the intermediate layer of the sink rolled used in the hot galvanizing groove is provided; the components of the welding wire are as follows (mass percent): 0.04 percent to 0.08 percent of C, 0.3 percent to 0.6 percent of Si, 1.0 percent to 1.5 percent of Mn, 10 percent to 12 percent of Cr, 3 percent to 5 percent of Ni, 0.5 percent to 1.2 percent of Mo and the rest is Fe. The surfacing method of the welding wire comprises the following steps: a surfacing area is processed from the roller surface of the sink roller by a machine; the welding wire is matched with an SJ81 welding flux, 300A to 350A of welding current, 28 V to 30V of welding voltage and 400 mm to 600 mm per minute of welding speed for surfacing; and heat treatment anneal is carried out after being heated to 500 DEG C to 540 DEG C. In the invention, the intermediate layer is produced between the austenitic stainless steel substrate and a hot spraying WC-Co coat of the sink roller and a stabling roller, which are working in the hot galvanizing groove, thus improving the combination between the hot spraying WC-Co coat and substrate material.

Description

technical field [0001] The invention relates to a sinking roll for a hot-dip galvanizing tank, in particular to a transition layer of a sinking roll for a hot-dip galvanizing tank, and at the same time, the invention relates to a welding wire for overlaying welding of a coating roll and a overlaying method thereof. Background technique [0002] The sinking roll and stabilizing roll working in the hot-dip galvanizing tank on the hot-dip galvanized steel strip production line with a width of 1m-2m are made of 00Cr17Ni14Mo2 austenitic stainless steel, and the roll surface is sprayed with WC-Co coating by HVOF to To ensure the effective progress of the hot-dip galvanizing process. However, due to the difference in performance between the WC-Co coating and the austenitic stainless steel, the coating peels off from time to time, resulting in the unsmooth production of galvanized steel strip. Even if it does not affect the hot-dip galvanizing process, it will also cause damage to t...

AI Technical Summary

Problems solved by technology

However, due to the difference in performance between the WC-Co coating and the austenitic stainless steel, the coating peels off from time to time, resulting in the unsmoo