| 摘要 |
FIELD: ferrous metallurgy, steel melting practice. SUBSTANCE: feedstock comprises oxidic lumpy material onto which iron-carbonaceous alloy is poured. Oxidic lumpy material has specific surface area of 5-100 sq.m/t, while carbon-to-silicon ratio in iron-carbonaceous alloy is equal to 40>C/Si>4. Hot cast iron is used as iron-carbonaceous alloy, while as oxidic lumpy material use is made of iron ore pellets, iron ore, ore concentrate, scale, dust-like wastes, slag resulting from sinter production, blast-furnace dust. Solid feedstock can be used for melting steel in various steel-melting apparatus, predominantly in oxygen converters and electric-arc steel-melting furnaces. Feedstock offers following advantages: earlier oxidation of carbon contained in metal base by oxygen from oxidic lumpy material, higher decarburizing rates at low bath temperatures at beginning of heat, more uniform oxidation of carbon in course of heat, stabler carbon content in molten material, lower residual content of undesirable elements in electrical-grade steel, increased yield of superior grades of steel. EFFECT: improved steel quality. |
