A Study of Heat Resistance of the Metal Coating Obtained by 10G7M3S2AFTYu Flux-Cored Wire Surfacing

The processes in petrochemical industries often take place at high temperatures, which determines the use of materials with high heat resistance for parts and components of technological equipment in this industry. When exposed to high temperatures, scale is formed on the metal surface, which leads to deterioration of its mechanical and operational properties. Therefore, the problem of improving the performance of parts operating under the conditions when they do not only wear out but also have to endure high temperatures is of great practical importance. Heat resistance of 10G7M3S2AFTYu-coated steel was studied under the temperature of 900°С. It was established that the main increase in the mass of scale for this steel occurred in the first hours, and later this dependence was almost straight-line. The average weight gain of the metal scale of such a coating at 900°С was 0.0035 kg/(m²·h). The presence of selective intercrystalline high-temperature interaction was determined, the products of which were carbides, oxides and nitrides of active alloying elements along with simple iron and manganese oxides. It was shown that the basis of the surface layer of the 10G7M3S2AFTYu metal scale was formed from compounds Fe₂O₃, Fe₃O₄, VO, MoO₂ that have average protective properties, as well as Fe_1,26Mn_0,74O₃, Мn₂О₃, SiC, VNi_0,81, AlC₃N₃ that have relatively high protective properties. It was concluded that flux-cored wire 10G7M3S2AFTYU could be used for surfacing parts and units of heat transfer systems.

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