Iron base hardfacing flux-cored wire containing superfine carbide hard phase

Abstract

The invention provides an iron base hardfacing flux-cored wire containing a superfine carbide hard phase and belongs to the field of welding materials. A stainless steel band is adopted for wrapping metal powder. The iron base hardfacing flux-cored wire containing the superfine carbide hard phase comprises the following elementary compositions in percentage by weight: 8.6-20.2% of Cr, 1.2-4.1% of B, 0.5-2.4% of Nb, 0.47-1.9% of C, 1.86-2.9% of Mn, 1.5-2.5% of Si and the balance of Fe. The filling rate of the flux-cored wire is 22-27%; surfacing alloy is prepared by virtue of adopting carbon dioxide gas protective welding; the welding parameters are as follows: the welding current is 180-230A, the voltage is 22-28V, the wire feed speed is 420-480mm / min, the gas flow rate is 17-22L / min, and the length, extending out of a current contact nozzle, of the flux-cored wire is 15-28mm. The rigidity of the iron base hardfacing flux-cored wire alloy is up to 66HRC, the alloy has favorable toughness and rigidity matching, can be used for improving the abrasive resistance, and is especially excellent in abrasive resistance under an impact working condition; the surfacing manufacturability is good; no cracks are generated in a welding process, and formation of weld is attractive.

Description

Technical field [0001] The invention belongs to the technical field of material processing welding materials, and relates to a wear-resistant surfacing flux-cored welding wire containing ultrafine carbide hard phases, which can be widely used in mechanical wear parts of engineering machinery, cement, electric power, metallurgy and other industries Repair and manufacturing Background technique [0002] Abrasion is one of the main causes of mechanical failure, and abrasive wear accounts for more than 50%. In the development of modern industry and technology, mechanical equipment and its parts have higher and higher requirements for material wear resistance during use, and service life has increasingly become an important factor affecting the production efficiency of modern equipment. According to statistics, about 30% of the energy in developed countries in the world is consumed by wear in different forms. In recent years, my country consumes more than 3 million tons of metal wear...

AI Technical Summary

Problems solved by technology

[0004] At present, the widely used wear-resistant surfacing welding flux-cored welding wire is mainly based on high-chromium iron-based alloy or high-high boron iron-based alloy. This kind of surfacing material is formed by adding a large amount of chromium or boron. A large number of Cr7C3 hard phases or Fe2B hard phases are used to improve wear resistance and wear resistance. This type of hard phase is large in size and will cause splits to the body and is relatively brittle. Although the hardness is high, the toughness is too poor. Due to the poor matching of its hardness and toughness, its wear resistance is poor, especially under the condition of impact wear, a large amount of hard phase peels off, which greatly reduces the wear resistance

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