SU730826A1 - Method of killing agent addition into liquid metal - Google Patents

Description

(54) METHOD FOR INPUT OF LIQUID DISPENSANTS INTO LIQUID METAL

I

The invention relates to ferrous metallurgy and can be used in melting, in particular in the deoxidation of unalloyed, low alloyed and alloyed steel in the ladle.

Known stkhyub input deoxidizers (aluminum) in a furnace or ladle with steel using a pin, on one end of which aluminum is fixed, and on the opposite side - a counterweight with an earring. Using the shackle, the boom of the crane winch is lowered into the metal ij.

However, using this method to introduce large amounts of aluminum (2-12 kg / t) when smelting aluminum-alloyed steels leads to heterogeneity of steel according to 61LUMINATION and. to its inapplicability even in combination with gas treatment.

The purpose of the invention is to reduce the time of dissolution of the deoxidizing agents and the heterogeneity of their distribution in the metal. In order to achieve the delivered zoli in the method including the pre-dried

attaching the deoxidizers to the metal shtap: e and entering them with onHOBpeNteHHOM by eccentrically introducing gas into the metal bucket in the metal, the deoxidizers are moved by moving the rod reciprocatingly in a vertical plane at a speed of 1.23 m / min for 82-96% of the input time. The introduction of deoxidizers into the liquid metal is carried out in a zone equidistant from the center of the ladle, diametrically opposed to the gas inlet zone. When smelting aluminum-alloyed steels (electrical with aluminum content O, 2 O, 5 wt.%), With the introduction of 90-1200 kg of primary pig aluminum into a 1OO-TON bucket, it is advisable to additionally deoxidize when they are inserted due to the rotation of the rod of the vertical axis with a speed of 3180 rpm.

If necessary, deoxidizers with different deoxidizing methods are fixed on the same rod and the proposed technology allows to accelerate the dissolution of deoxidizers by moving in steel due to an increase in the coefficients .aHt 4; yaiiH deoxidizers, as well as through the liquid layer from above) deoxidizing. At the same time, it is fired, it is said that deoxidizing agents are lost in the metal in the ladle. At speed. reciprocating post motion

less than 1.2 mln ltgshp practically does not accumulate to reduce their dissolution time from the input as compared with the lime method, and at a speed of more than 30 m / min the steel uniformity does not increase and the likelihood of deoxidizers from the slag zone increases sharply in laying mash bucket. Experimental melting and polarized steel uniformity results, taking into account the time spent for deoxidizing agents at rest — at the upper and lower dead points, show that the optimal time is re-evaluating deoxidizing agents 82-96% of the time they entered, i.e. their complete dissolution. When an eccentric gas is introduced through a porous tuyere in the bottom of the bucket, two gas etalic flows are formed in the metal (with a corresponding gas flow) - starting from the tuyere upwards and DOWNLOAD. The location of the latter is a metal zone equidistant from the center of the bucket diametrically opposite the input area gas. The speed of rotation of the rod with a caliper less than 3 rpm does not increase the rate of dissolution. Increasing the speed of rotation of the rod more than 18O rev / m when entering 4 kg / ton of deoxidizing agent and more leads to splashes of slag and metal from the ladle.

Example 1. When an alloyed electrical steel is overlaid, after the alloy is melted, the impurities are oxidized, and the metal is alloyed, it is released into the ladle. The ladle is installed on the bench and aluminum is introduced into the metal simultaneously with the introduction of argon through the porous insert in the bottom. 4 kg aluminum is fixed at a distance of 1 mm from the end of the rod. The boom is inserted vertically into the metal and is moved back to the available at a speed of 3 m / min. The displacement is made within 3 minutes at the input time of the deoxidizing agents 3 minutes 34 seconds. After removing the rod from the ETPLP, the ladle is fed for casting. 730

removing the metal rod from the ladle is fed to the casting.

PRI me R 3, When splicing aluminum-alloyed electrical steel, 370 kg of aluminum is fixed to the bar and the bar is inserted into the metal bar after it is withdrawn from the furnace. Moving the bar up and down at a speed of 15 m / min, it rotates at a speed

16 rpm At the same time, aluminum is in the metal zone diametrically opposite to the argon input zone. These zones are equally spaced from the center of the bucket. After reciprocating movement and rotation of the rod for 12 minutes, when aluminum is in the metal for 12 minutes and 40 seconds, the rod is removed from the metal and the ladle is fed to the casting. Entering deoxidizers into the ladle with metal on the rod with an alternating last-reciprocating (R-down) at the head of steel 16G2SAF And electrical allows to reduce the time of entry of aluminum

by 20-30% and get the metal with aluminum evenly distributed in it.

Claims (3)

1. The method of introducing deoxidizers into the liquid metal, including pre-fixing them on the metal rod, the injection rod in the liquid metal in the ladle treatment of metal with gas, in order to reduce the time for dissolution of deoxidizing agents and the inhomogeneity of their distribution in the metal, the rod is moved in the metal return-accessible in the vertical plane at a speed of 1.2-30 m / µm for, time input deoxidizers. 2. The method according to claim 1, distinguishing ush and also with the fact that, when the gas is introduced into the ladle, the deoxidizing agents are introduced into the metal in the zone into the zone equidistant from the pitcher and diametrically opposite the gas inlet zone. 64 PRI mme R 2. At the top of the 17G2FB steel, the deoxidizing agents reinforce aluminum and ferrocerium on a 4-meter-long rod. 65 kg of aluminum is fixed at the End of the rod, and 100 kg of ferroceri - at a distance of 50 mm from aluminum. The boom is introduced into the metal and is moved reciprocally in it at a speed of 3 m / min at a speed of 5 minutes at a time of input of deoxidizing agents for 5 minutes and 20 seconds. After 57.308266 3. The method of gyu p. 1, about tl and h and y-sources it1 | {yurmash, IH and also with the fact that simultaneously with the vertices taken into account during expert examination, the rod rotates around the vertical axis with speed1. US Patent N 31686О8, 3-180 rev / min. 266-34, 1962.