| 摘要 |
<p>In the present invention there is disclosed a process for producing high-alloy austenitic and austenitic-ferritic steels by melting a starting charge within an electric arc furnace and by further processing thereof by vacuum oxidation decarburization process by making use of chemical heating as a supplementary heat source. The invented process is characterized by adding into the heat and during the vacuum oxidation decarburization process, after finish of oxidation phase 0.5 to 20 percent by weight, based on said charge total weight, of solid high-alloy steel scrap, such as boron or manganese high-alloy steels, whereby prior and/or after this addition of the solid scrap a chemical heating of the bath is carried out at least once during which 0.5 to 8 kg per ton of steel of aluminium additive and/or aluminium together with silicon ferroalloys additive is added into the bath. After this addition, oxygen is blasted through at least one oxygen nozzle and under vacuum ensuring exhaustion of gaseous products into the bath in a volume rate of 10 to 70 cubic meter per hour and per one ton of the heat total weight, wherein content of aluminium or silicon is simultaneously maintained at a level being at least equal to the level of their critical concentration, thus preventing excessive growth of oxygen amount in the metal bath volume, whereupon after homogenization under refining slag and immediately prior finish of melting the final alloying and homogenization of steel is carried out.</p> |
