SU1260393A1 - Method of producing steel - Google Patents

Abstract

The invention relates to the field of metallurgy, and more specifically to the production of steel for various purposes in arc furnaces. The aim of the invention is to reduce the duration of the melting and to ensure the specified silicon content in the steel. After alloying the metal, the silicon content is adjusted to the temperature of the metal measured before and after the steel is rolled from the furnace, starting from an additive of 0.5-0.8 kg / ton of silicon-containing ferroalloy for each temperature of the non-calculated differential. The melting time was reduced by 18 min and provided the specified silicon content in steel. i (L kae W with co 00

Description

The invention relates to metallurgy, in particular to methods for smelting steel for various purposes in arc steel-smelting furnaces.

The purpose of the invention is to reduce 5 the duration of melting and to ensure the specified silicon content in steel. When doping materials are introduced into the metal bath, the metal is cooled. In the event that the metal is covered with a layer of oxidizing slag, in parallel with the cooling of the metal with alloying materials, the bath is heated due to the exothermic oxidation reactions of the slag oxidizing oxides. The degree of heating of the bath can serve as an accurate estimate of the degree of alloying alloy loss and the amount of slag in the furnace.

 When a metal is released into the ladle, its temperature decreases within the limits of 3-7 ° C per minute to a dependent-20.

TI from arc furnace capacity, SPEED;

its inclination and method of release of metal on the crane or on the steel truck. This is the so-called 25 calculated (expected) difference in temperature. The burden of releasing the metal from the furnace is 10–200 t for 2–8 min, depending on the capacity of the furnace, the temperature of the steel before the 30th step and the method of metal extrusion. Based on this, the calculated temperature difference, for example, 100 tons of the arc furnace when it is released to the crane and the release time of 6 minutes is 5 ° C / min x 35 X 6 minutes.

An additive of silicon-containing ferroalloy in an amount of less than O, 50 kg / t for every 10 ° C of an unplanned differential results in a cream content of 40 or less than the lower grade limit, and an additive in an amount of more than 0.8 kg / ton in obtaining silicon content above the upper brand limit or the irrational use of silicon.

When the steel 25G2S was smelted, the charge was melted, the melting slag was updated with lime additives 15 kg / t and Marat sintering 50 kg / t, the metal was blown with oxygen, the oxidizing slag was lowered to the remainder in the furnace in an amount of 4 tons (4% by weight of the metal, the temperature of the metal is measured, which is 55 liters of 1640 ° C, the metal is doped with an additive of 16 kg / t of silico-manganese and 0.8 kg / t of ferro-sicil, the temperature is measured

 metal, which is 1670 ° C, is introduced (1670-1640): 10 x 1.15 3.45 kg / t (345 kg) of 45% ferrosilicon and releases the metal into a steel-ladle.

The melting time is reduced by 20 minutes and ensures the specified silicon content in steel is 0.64%.

PRI mme R 2. In 50 t of arc furnace when steel is melted, K) melted

The charge, the molten slag is updated with 10 kg / ton of lime additives and 6 kg / ton of scale briquettes, the metal is blown with oxygen, the slag is drained from the furnace to a residue of 1 ton (2% of the metal weight), the temperature of the metal is measured. em 1670 C, alloyed metal with an additive of 7 kg / ton of ferrosilicon and 4 kg / ton of ferromanganese measure the temperature of the metal, which is 1680 C, injected (1680-1670): 10 X 0.7 0.7 kg / ton ( 35kg) 65% ferrosilicon and release

 metal casting ladle.

The melting time is reduced by i4 min and provide the specified content

| Silicon in steel 0.17%.

Propper 3. In the melting of steel 35, 200 tons of arc furnaces melt the charge, renew the melting slag with lime additives 30 KF / T and oxidized oaks of 20 kg / t, flush the metal with oxygen, lower the slag until it remains in the furnace in the amount 6 tons (3% of the weight of the metal) measure the temperature of the metal, which is 1630 ° C, alloy the metal with 6 kg / ton of ferrosilicon and 4 kg / ton of ferromanganese, measure the temperature of the metal, which is 165Q ° C, injected (1650-1 BSO): 10 x X 0.925 1.85 kg / t (370 kg) of silicon-calcium and the metal is released into the steel-ladle.

The melting time is reduced by 16 minutes and the specified silicon content in steel is 0.19%.

Example4. During the smelting of 40X steel, the arc furnace melts the charge, the melting slag is updated with limestone 10 kg / ton and pellets 5 kg / ton, the metal is flushed with oxygen, the slag is lowered to leave it in the furnace in an amount of 0.4 tons (4% of metal weight), the temperature of the metal is measured, which is 60Q ° C and the metal is released into the ladle, alloying 1.5 kg / ton is introduced into the jet

3 ferrochrome and 0.5 kg / t of silicomanganese, after being released in the ladle, the temperature is measured, which is calculated at 10 ° C. During out-of-furnace treatment with argon, 10:10 x 0.5 0.5 kg / t are introduced into the ladle silicocalcium.

The melting time is reduced by 15 minutes and ensures the specified silicon content in steel is 0.20%.

PRI me R 5. In the smelting of steel 10, 100 tons of an arc furnace melt the charge, update the melting slag with lime additives 10 kg / t and chamotte 2 kg / t, flush the metal with oxygen, lower the slag to leave it in the furnace the amount of 2 tons (2% by weight of the metal), the temperature is measured, which makes up and releases the metal in the ladle, with alloying 6 kg / ton of silico-manganese and 3 kg / ton of ferrosilicon being placed on the bottom of the metal. After discharge in the ladle, the temperature of the metal is measured which is higher than the calculated temperature by 25 ° C. When out-of-furnace treatment of metal with argon in a ladle

, enter 25:10 x 0.8 2 kg / t - (200 kg) silicocalcium.

Melting time is reduced by 14 minutes

and ensuring that the specified silicon content in steel is 0.17%.

Example 6. In the smelting of steel 20, 100 tons of an arc furnace melt the charge, update the smelting slag with limestone, 10 kg / t, and chamotte 5 kg / t, blew the metal with acid. Horticom, Descent: Slag before leaving it in the furnace in the amount of 4 tons (4% by weight of the metal), the temperature is measured.

Editor N. Kishtulints

   - - ..,

Order 5192/22

Tehred A. Kravchuk. . Corrector

Circulation 552Subscribe

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, - st. Project, 4

3934

which is 1650 ° C and the metal is released into the ladle, with 6 kg / ton of silico-manganese being introduced into the ladle at the outlet. After discharging, the temperature of the metal is measured, which is more than the calculated value. After measuring the temperature, 15:10 x 0.65 0.975 (97.5 kg) silicocalcium was introduced into the ladle.

The melting time is reduced by 18 minutes and ensures the specified silicon content in steel is 0.20%.

These examples allow for 100 tons of the melts of silicon to correct the silicon content in the metal without sampling their analysis.

Fb rmula of invention

The method of steel production, which includes melting the charge, upgrading the slag by adding slag-forming agents, purging the metal with oxygen, removing the oxidizing slag to the remainder of it in the furnace in an amount of 2-4% by weight of the metal and discharging into the steel ladle. and with the fact that, in order to reduce the duration of melting and to ensure the specified silicon content in steel, after alloying the metal

using manganese and silicon, the silicon content in the casting ladle is adjusted by the temperature of the metal before and after the steel is released from the furnace, starting from an additive of 0.5-0.8 kg / t of 65% silicon-containing ferroch: for each temperature increase odd differential.

Compiled by M. Menshikov

Tehred A. Kravchuk. . Proofreader M. Sharoshi

Claims (1)

Claim The method of steel production, including melting the charge, updating the melting slag with slag-forming additives, purging the metal with oxygen, removing oxidizing slag to the remainder in the furnace in an amount of 2-4% by weight of the metal and discharging it into the steel pouring ladle, differs. that, in order to reduce the melting time and ensure the specified silicon content in the steel, after alloying the metal with manganese and silicon, the silicon content in the steel pouring ladle is adjusted according to the metal temperature before and after the release of steel ali from the furnace based on the additive of 0.5-0.8 kg / t of 65% silicon-containing ferroalloy for every 10 ° С increase in the temperature of the non-calculated differential.