Scaling resistance of deposited metal by flux-cored wire 30N8Kh6M3STYu

Abstract

The scaling resistance of a coating deposited by a flux-cored wire 30N8X6M3STYu subjected to surface oxidation at a temperature of 900 C was studied. It was established that the main increase in the mass of scale for a given metal occurs in the first hours, and later this dependence is almost straightforward. The average weight gain of the metal scale of such a coating at 900 C is 0.002 kg/(m2•h), which is 16.5 times less than that of 30Kh2V8F steel. An X-ray analysis of a metal of the composition 30N8X6M3STYu showed that the scale consists not only of the oxide phase, but also of the remnants of non-oxidized grains of solid solution, nitrides and carbides. It was found that the basis of scale, along with hematite Fe2O3, magnetite Fe3O4, are various compounds of the main alloying elements such as Cr2FeO4, Fe2NiO4 and Fe3N, which have good protective properties. The results show that the coating of steel 30N8Kh6M3STYu can be used for applying on the surface of parts operating at high temperatures. © Published under licence by IOP Publishing Ltd.