Processes for producing low nitrogen metallic chromium and chromium-containing alloys and the resulting products

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 11230751
APP PUB NO 20190003013A1
SERIAL NO

16122692

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Abstract

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Processes for producing low-nitrogen metallic chromium or chromium-containing alloys, which prevent the nitrogen in the surrounding atmosphere from being carried into the melt and being absorbed by the metallic chromium or chromium-containing alloy during the metallothermic reaction, include vacuum-degassing a thermite mixture comprising metal compounds and metallic reducing powders contained within a vacuum vessel, igniting the thermite mixture to effect reduction of the metal compounds within the vessel under reduced pressure i.e., below 1 bar, and conducting the entire reduction reaction in said vessel under reduced pressure, including solidification and cooling, to produce a final product with a nitrogen content below 10 ppm. The final products obtained, in addition to low-nitrogen metallic chromium in combination with other elements, can be used as raw materials in the manufacture of superalloys, stainless steel and other specialty steels whose final content of nitrogen is below 10 ppm.

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Patent Owner(s)

Patent OwnerAddress
COMPANHIA BRASILEIRA DE METALURGIA E MINERACAOCÓRREGO DA MATA S/N (CAIXA POSTAL 08) ARAXÁ MINAS GERAIS 38183-903

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fridman, Daniel Pallos Araxá, BR 2 9
Rios, Adriano Porfirio Araxá, BR 2 9
Sernik, Kleber A Greensburg, US 7 17
Vieira, Alaércio Salvador Martins Araxá, BR 1 0

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