Submerged arc welding flux-cored wire and preparation method thereof

Abstract

The invention provides a submerged arc welding flux-cored wire which comprises a steel belt and a flux core. Chemical components of the steel belt comprise, by weight, smaller than or equal to 0.02% of C, 0.2-1.2% of Mn, 0.3-1.8% of Si, 22-28% of Cr, 2-8% of W, 0.2-0.4% of Cu, 0.1-0.3% of V, smaller than or equal to 0.005% of S, smaller than or equal to 0.006% of P and the balance Fe. The components of the flux core comprise, by weight, 20-35% of marble, 15-28% of fluorite, 7-12% of mica, 6-14% of titanium dioxide, 2-8% of ferrovanadium, 2-6% of silicon iron, 2-12% of ferrotitanium, 13-17% offerro-boron, 2-8% of ferro-molybdenum, 3-12% of graphite and the balance chromium iron. By the adoption of the welding wire, while the hardness of overlaid metal can be improved, toughness and crack resistance of the metal are improved, the two aspects of metallurgy and the technology are improved, the high toughness and crack resistance of the overlaid high-hardness metal are improved, meanwhile,the good welding technology performance is ensured, slag removal is easy, splashing is avoided, the hardness is high, and the wear resistance is excellent.

Description

technical field [0001] The invention relates to a welding material, in particular to a submerged arc welding flux-cored welding wire and a preparation method thereof. Background technique [0002] Self-submerged arc welding flux-cored wire has only received attention and attention, and it is used for outdoor welding of parts such as petroleum, bridges, natural gas, ships, and offshore platforms. In the late 1970s, Baosteel imported hundreds of tons of submerged arc welding from abroad in the late 1970s. Flux cored wire is used in metallurgy, rolling stock and other fields. [0003] Foreign submerged arc welding flux-cored welding wire mainly studies the performance of two kinds of submerged arc welding flux-cored welding wire with aluminum content of 1.7% and 0.53% respectively, and establishes relevant models to predict the microstructure change. Thermodynamic calculations show that AlN is better than Ti (C, N) and A1203 in high-alumina welds, and the opposite is true in ...

AI Technical Summary

Problems solved by technology

[0004] The production of flux-cored welding wire in my country currently exists: product quality and stability need to be further improved There is still a lot of work to be done in terms of further improving product quality and stability, and the product varieties and specifications need to be increased urgently; Increase varieties and specifications to meet different needs; The degree of production scale should be further expanded. Small production scale will cause many problems such as high product cost and poor product quality stability. Only when a certain production scale is reached, will it enter Virtuous circle

[0005] Judging from the current high-hardness surfacing materials at home and abroad, almost all of them have a hardness greater than or equal to 60HRC; the content of carbon and chromium in the surfacing materials is relatively high, which belongs to the high-carbon and high-chromium alloy system, and is often suitable for severe wear and tear. In working conditions where cracks are not sensitive, a small amount of cracks are allowed to exist during use, and this alloy system is obviously not suitable for roll surfacing layers that require high toughness and crack resistance

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