DOI: 10.18503/1995-2732-2021-19-1-69-74
Abstract
Ferroniobium is one of the most expensive ferroalloys and an expensive metallurgical raw material. It is conventional to use FeNb65 grade (60–70%) added to steel as a lump material or flux-cored wire. Liquation of niobium in FeNb65 amounts to 10%, and this influences accuracy of the required dosing of the material. In order to ensure the accuracy of a chemical composition of molten steel, when adding any ferroalloy, it is necessary to carry out an incoming inspection of not only charge materials, but also ferroalloys. To determine a chemical composition of ferroalloys by conventional standardized methods, we need much time and a lot of expensive chemical reagents. This paper describes an express X-ray fluorescence analysis (XRF) of ferroalloys by the example of ferroniobium, using the Quant'X spectrometer. The authors showed a role of the sample preparation procedure, consisting of grinding the analyzed sample to the required size and pressing onto a boric acid substrate. The niobium content in pieces of applied ferroniobium is varied and de-termined to accurately calculate the required amount of niobium in finished steel, especially when it is smelted in low-capacity furnaces. This will make it possible to carry out microalloying of steel quickly and correctly and reduce its rejection (sorting) by a chemical composition. Therefore, to ensure that niobium percentage falls within a range speci-fied for the grade, it is necessary to inspect the compliance of a chemical composition of ferroniobium for microalloying with its technical conditions. The example of melting 10G2B steel grade in a 30 kg induction furnace shows that by calculating ferroniobium consumption rates according to results of an incoming spot inspection, we could make steel containing niobium within the ranges set for the relevant grade. Due to an insignificant range of fluctuations in niobium content (up to 2.2%) in the ferroalloy samples under study, we achieved its high recovery rate amounting to 73%.
Keywords
X-ray fluorescence analysis, ferroalloys, ferroniobium, preparation of samples for the analysis, incoming inspection.
For citation
Shishlonova A.N., Adishchev P.G., Malkov M.V. Incoming Inspection of Ferroniobium Applied for Steel Microalloying. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2021, vol. 19, no. 1, pp. 69–74. https://doi.org/10.18503/1995-2732-2021-19-1-69-74
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