Determination of low niobium content ( 0,01–0,1 wt.%) in high-strength steel

Goundobin N.V., Titov V.I., Pilipenko L.V.
UDC
669.018.292:669.15
DOI
10.18577/2307-6046-2016-0-6-3-3
Article PDF (Russian) (497.38 KB)
How to cite
Goundobin N.V., Titov V.I., Pilipenko L.V. Determination of low niobium content ( 0,01–0,1 wt.%) in high-strength steel // Proceedings of VIAM. 2016. No. 6. DOI: 10.18577/2307-6046-2016-0-6-3-3. URL: https://test.viam.ru/en/journal/2016/6/3
Keywords
methods, niobium, optical density, relative error, reagent sulfochlorophenol C, collector (zirconium), spectrophotometry, high-strength steel, phenylarsonic acid.
Abstract

Determination of low niobium content (0,01–0,1 wt. %) in the alloys having in their composition a large amount of alloying elements (which obstruct this determination), is a difficult task. Such types of alloys as steels, especially high-strength, are constantly subjected to modifications of their chemical composition to give them new properties, such as those associated with the impact toughness at various temperatures, lower thermal coefficient of linear expansion, temperature of hot forming and others. Niobium in small amounts (less than 0,9 wt. %) is added to various kinds of steel (chromium-nickel, high-strength, corrosion-resistant, high-strength welded, cemented, etc.). To control the low niobium content (0,01 wt. % higher) in high-strength steels with high accuracy (about 10% rel.) a method of spectrophotometric determination of niobium with reagent sulfochlorophenol C was developed. Niobium was preconcentrated at zirconium collector which was used in the course of analysis

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