RU97111271A - METHOD OF MANUFACTURE OF VANADIUM SLAG AND NATURALLY ALLOYED VANADIUM STEEL - Google Patents

Claims (9)

1. Method for the production of vanadium slag and natural vanadium steel, including the redistribution of vanadium iron in an oxygen converter for vanadium slag and intermediate products, which include pouring vanadium iron into a converter, purging it with oxygen and supplying refrigerants, redistributing the intermediate product for steel, providing filling in a converter for filling. intermediate, ignition and purging of oxygen smelting, portioning additive slag-forming in the course of blowing, the release of metal into the ladle, its carburization, deoxidation, le shading and finishing, characterized in that when vanadium cast iron is redistributed to vanadium slag and intermediate, scale and metal waste with a fraction of 10-120 mm are used as coolers, which are fed to the converter after casting iron and / or during blowing with 30-80 kg metal waste consumption / t of pig iron and scale 15-40 kg / t of cast iron, and when redistributing semi-finished products on steel, scrap metal, metal facilities and / or scale are used as coolers, slag-forming materials are placed in the course of purging after ignition of the melt in batches providing wholesale mal slagging speed and heating of the metal, the metal is purged until the carbon content less than 0.07 wt.% and carburization, melting, alloying with vanadium metal and partial deoxidation is carried out with liquid vanadium iron, the amount of which is determined by the carbon content in the finished steel by the formula
Q = V • (Const. / Acc.)
where V is the mass of liquid steel before carburization, tons;
St. - the average carbon content in a given steel grade, wt.%;
Sc.ch.- carbon content in cast iron, wt.%.  2. The method according to p. 1 wherein that in order to optimize the heat balance of smelting during the redistribution of the intermediate product into steel, scrap metal and / or metal waste is additionally heated.  3. The method according to p. 2, characterized in that the heating is carried out by supplying carbon-containing fuel under and / or for scrap metal and burning it with oxygen.  4. The method according to p. 3, characterized in that coke and / or its screenings, coal, coal lining and electrodes, oil, fuel oil and natural gas are used as carbonaceous fuel.  5. The method according to p. 1, characterized in that during the redistribution of the intermediate product on steel, metal waste is seated on the path of bulk materials in the course of blowing the main board.  6. The method according to p. 1 wherein that when the intermediate product is redistributed to steel, a part of the slag is left in the converter.  7. The method according to p. 1, characterized in that vanadium cast iron, intended for carburization, deoxidation and alloying of the metal, is additionally injected with 20-50% of the strong deoxidizing agents required for melting.  8. The method according to p. 1 characterized in that when carburizing, deoxidation and alloying of the metal with liquid vanadium iron, get a mass fraction of vanadium in the finished steel in the range of 0.05-0.15%.  9. The method according to p. 1, characterized in that the finishing of the metal according to temperature, chemical composition and structure is carried out at the "furnace-ladle".