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tantalum niobium mb

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Niobium and columbium are synonymous names for the chemical element with atomic number 41 columbium was the name given in 1801, and niobium Nb was the name officially designated by the International Union of Pure and Applied Chemistry in 1950. Niobium in the form of ferroniobium is used worldwide, mostly as an alloying element in steels and in superalloys..

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