High anticrack, wear-resistance, high-cr cast iron cored solder wire for huild-up welding

Abstract

The present invention relates to a high-anticracking high-chrome cast iron type hardfacing flux-cored welding wire. Its flux core composition includes (by wt%) 43-70% of chromium carbide, 10-25% of ferrovanadium, 1-5% of 75# ferro-silicon, 3-8% of metal manganese, 1-3% of alumino-magnesium alloy, 2-5% of ferro-boron, 2-6% of ferro-titanium, 1-5% of ferro-niobium and 2-8% of ferro-molybdenum.

Description

technical field [0001] The invention belongs to the field of welding in material processing engineering, and the invention is mainly used in the surfacing repair of high-stress, high-impact wear parts such as steel mill coal grinding rollers, cement grinding discs, crusher hammers, cold (hot) rolling bars, etc. Background technique [0002] At present, in the mining, building materials and electric power industries in our country, about 800,000 tons of steel are lost due to wear and tear every year. Improving the wear resistance of materials and reducing wear and tear are important tasks that the production department expects to solve. [0003] High chromium cast iron is one of the best wear-resistant materials after ordinary white cast iron, high manganese steel and nickel hard cast iron. It has been applied in our country since the 1980s, because the tissue contains ideal M 7 C 3 Type carbide, compared with other white irons, shows good wear resistance and comprehensive ...

AI Technical Summary

Problems solved by technology

However, due to the large amount of alloy used, it is still a brittle material. During use, especially under high stress and high impact conditions, parts often break and break, which limits its scope of use.

[0004] Most of the high-chromium cast iron surfacing flux-cored wires used at present are imported from the British alloy welding company (Welding-Alloys, referred to as WA Company). When the surfacing is multi-layered, due to the accumulation of residual stress, the cracking is more serious. The cracks crack from the surface of the surfacing layer to the bottom of the surfacing layer. When subjected to high stress or high impact load, the surfacing metal will Will break along the crack, peel off

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