SU488868A1 - The method of gas treatment of liquid steel - Google Patents

Description

(54) LIQUID STEEL GAS TREATMENT METHOD

by introducing gas in the form of bubbles of various sizes, the necessary conditions for refining a metal or doping with nitrogen in the case of using gaseous nitrogen. The proposed method of introducing gas has a high effect when registering steel with nitrogen.

This completely eliminates the use of expensive ferroslakes.

The introduction of gas into: the process of moving the tuyere in the melt at a rate of 0, 5 m / min gives the necessary results in a short time for the backlash. melting of various grades of steel and alloys

Example, When smelting steel 16G2SAF, scrap cast iron, lime and iron ore materials are loaded into another furnace at the rate of 2.0 kg / ton.

When the charge is melted, the iron ore materials in the amount of 10 kg / ton and lime 15 kg / tonne are additionally introduced into the furnace to increase the degree of removal.

After carrying out the oxidizing and reducing periods, the gshayish in the furnace metal is released into the ladle „

The bucket is mounted on the stand and lowered into the metal of the tuyeres; / at the speed Ij2 m / min and od4

At the same time, nitrogen was added to the alloy doping with the intensity O, O8 min for 5 min, and the total duration of purging was 5 min. 2.6 sec. In this case, nitrogen is introduced simultaneously through the channels and channels in the nozzle of the tuyere. The time for lowering the {1I and tuyeres in the metal is 1 and 4 min, respectively, and the gas flow through the pores of the nozzle and its channels is distributed in a 1: 5 ratio.

The proposed method in the smelting of electrical steel grades reduces the time of production and argon consumption and also ensures reliable processing in the ladle

all argon bottoms

The subject is invented and

The method of gas treatment of liquid steel, in: including the flow of gas into the metal through on. risky refractory nozzle with scoops of a vertical lance of a tuyere that has a reciprocating interchange; , characterized in that, in order to reduce the processing time, the flow rate of the injected gases and increase the yield, gas is introduced during lowering and raising the lance at a speed of 0.3 ... 2.5 m / min during the purge time and lifting tuyere. Jiaxodits in the ratio (0,): (2 ,,). and the gas flow through the nozzle vapors. (;: gas flow rate through its channels as {0,): (5 .-. 15.) ...