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1. US20170191145 - PROCESSES FOR PRODUCING LOW NITROGEN METALLIC CHROMIUM AND CHROMIUM-CONTAINING ALLOYS AND THE RESULTING PRODUCTS

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims

1- 8. (canceled)
9. A metallic chromium or chromium-containing alloy having a nitrogen content below 10 ppm.
10. A chromium-containing alloy additionally containing an element selected from the group consisting of nickel, iron, cobalt, boron, carbon, silicon, aluminum, titanium, zirconium, hafnium, vanadium, niobium, tantalum, molybdenum, tungsten, rhenium, copper, and mixtures thereof having a nitrogen content less than 10 ppm prepared by a process comprising:
i) vacuum-degassing a thermite mixture comprising chromium compounds and metallic reducing agents, contained within a vacuum vessel capable of withstanding a thermite reaction, to an initial pressure less than 1 mbar;
ii) igniting the thermite mixture to effect reduction of the chromium compounds within said vessel under reduced pressure;
iii) solidifying the reaction products under reduced pressure; and
iv) cooling the reaction products to about ambient temperature under reduced pressure,
wherein steps ii) through iv) are conducted under a pressure below 1 bar, and wherein the thermite mixture additionally contains an element selected from the group consisting of nickel, iron, cobalt, boron, carbon, silicon, aluminum, titanium, zirconium, hafnium, vanadium, niobium, tantalum, molybdenum, tungsten, rhenium, copper, and mixtures thereof in their metallic form or as compounds thereof capable of metallothermic reduction.