| abstract |
The invention relates to metallurgy, in particular to the production of steels with low and restricted hardenability in electric arc furnaces, induction furnaces and oxygen converters. A metallurgical unit is loaded with a metal charge comprising an iron-carbon alloy, graphite and scrap, each containing a restricted amount of manganese, silicon, chromium, nickel and copper so that the final content of each of said elements is a maximum of 0.1% by mass for low-hardenability steel and a maximum of 0.3% by mass for restricted-hardenability steel, and slag-forming components, the melt is refined in terms of its carbon content in an electric arc furnace or an induction furnace to a carbon content corresponding to the upper permissible limit, or lower, in the converter, before the smelt is discharged into a ladle or furnace-ladle, and then carbonized in the ladle, after which the melt is deoxidized in the ladle or furnace-ladle with 1.0-2.5 kg/t of aluminium, and titanium and vanadium. The invention makes it possible to produce higher mechanical properties and stable hardenability. |