High-hardness self-protecting cold roll build-up welding flux-cored wire

Abstract

The invention discloses a high-hardness self-protecting cold roll build-up welding flux-cored wire, and belongs to the field of welding in material processing. The flux-cored wire is mainly applied to build-up welding repair of cold rolls of steel mills. The flux-cored wire is characterized in that: the outer surface of the powder cored wire is an H08A cold rolling steel strip; and the powder of the powder cored wire comprises the following components in percentage by mass: 25 to 45 percent of high carbon ferrochrome, 5 to 15 percent of chromium metal, 4 to 8 percent of ferromolybdenum, 5 to 10 percent of manganese metal, 4 to 8 percent of No.75 silicon iron, 4 to 10 percent of aluminum magnesium alloy, 6 to 12 percent of ferrocolumbium, 4 to 10 percent of ferrotungsten, 4 to 12 percent of nickel powder and 4 to 18 percent of iron powder. A coating prepared by build-up welding has high hardness (Rockwell hardness (HRC): 55 to 60) and excellent abrasion resistance; and a self-protecting build-up welding mode is adopted, namely a protective gas source and a flux are not needed in the build-up welding process, and slag knocking is not needed in the build-up welding process, so automatic production is easy to realize.

Description

technical field [0001] The invention discloses a high-hardness self-protecting cold roll surfacing flux-cored welding wire, which belongs to the field of welding in material processing. The invention is mainly applied to the surfacing repair of cold rolling rolls in steel mills. Background technique [0002] Rolls are the most important processing tools in the metallurgical industry. In the production of plates and strips, cold rolls not only have to withstand high wear during normal rolling production, but also can withstand local stress overload without damage when the rolling mill fails. The quality of cold rolls directly affects the quality of steel plates and strips. material surface quality. [0003] Overlay welding technology is a technology that uses welding technology to deposit wear-resistant alloys on the surface of workpieces. It is one of the important technical means to improve the service life of rolls in the metallurgical industry by using surfacing welding...

AI Technical Summary

Problems solved by technology

[0004] The cold roll surfacing repair materials used today have low hardness (HRC 45-52), and the welding method used is submerged arc surfacing. This method requires a large amount of flux, which increases costs, and slag needs to be continuously knocked out during the surfacing process. , increasing the labor intensity of workers and reducing production efficiency

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