Hot roll surfacing submerged arc flux-cored welding wire and preparation method for same

Abstract

The invention relates to a hot roll surfacing submerged arc flux-cored welding wire and a preparation method for the same. The hot roll surfacing submerged arc flux-cored welding wire comprises the following ingredients in percent by weight: 5%-14% of CaF2, 0%-5% of Na2SiF6, 0%-5% of BaCO3, 0.1%-0.4% of C, 2.0%-5.5% of Mn, 14%-28% of Cr, 0.8%-6% of Ni, 2%-4.8% of Si, 0.6%-4.8% of V, 0.8%-7.2% of W, 2%-6% of Mo and the balance Fe. A steel belt of the flux-cored welding wire is low-carbon, and the content of the carbon of the steel belt is smaller than 0.05%; and powder filling rate is 18%-28%, and the particle size of powder is 80-200 meshes. The submerged arc flux-cored welding wire has the advantages that metal alloy elements of a surfacing layer are distributed uniformly; carbide is scattered; the hardness is uniform; contents of impurities and diffusible hydrogen are low; the crack resistance, the thermal fatigue resistance and the wear resistance are high; the hardness of the surfacing layer is uniform; and the service life is long.

Description

technical field [0001] The invention relates to the field of welding materials, in particular to a hot roll surfacing welding submerged arc flux cored wire and a preparation method thereof. Background technique [0002] Hot rolls are key components of steel companies, and their quality and service life directly affect the production rate of rolling mills, the output and quality of rolled products, the consumption of rolls, material costs, and maintenance costs. The working process of hot rolling rolls is mainly subjected to wear between metal and metal, as well as abrasive wear caused by hard spots such as scale on the steel plate surface, and more than 70% of hot rolling rolls are mainly caused by wear and tear failure. Therefore, the metal surface of the surfacing layer is required to have high hardness and high wear resistance. At the same time, when the hot roll is working, it is in contact with the rolling piece with a temperature exceeding 900°C, so that the maximum s...

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Problems solved by technology

[0005] Aiming at the problems that the surfacing process of the hot roll surfacing flux-cored welding wire in the past is complicated, the surfacing layer is prone to hot and cold crack defects, the metal hardness of the surfacing layer is uneven, the wear resistance is insufficient, and the service life is short, the present invention proposes A flux-cored welding wire for submerged arc welding that contains pre-melted alloy powder, diffused hydrogen inhibitor, and undergoes dehydrogenation heat treatment. It has uniform distribution of metal alloy elements in the surfacing layer, dispersed carbides, uniform hardness, and low content of impurities and diffused hydrogen. , good crack resistance, strong thermal fatigue resistance, uniform hardness of surfacing layer, high wear resistance and long service life

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