SU501075A1 - Melting method in an arc furnace - Google Patents

Description

The invention relates to ferrous metallurgy, in particular, to the manufacture of steel in electric arc. In existing smelting methods for electrolytic metal, lowering and carbonization of the metal and its overheating, electrodes with a protective coating Ij are used or the transformer is used to switch to transformer to lower level 2J. There is a known method of smelting metal in three phase phase 3j, where not only the structure of collar electrodes is described, but also the way they work in the field. The casting process includes loading and burning, its melting and cooling, and heating with arcs of irradiating action, which are hot between the electrode, consisting of several sections, isolated from one another, and metal. At the same time, the electrodes are turned on in such a way that phase currents flow through each of the irimming sections. However, in this method in the iriod of refining, the metal is carbonized due to carbon transfer from the electrodes, and 1 also has melt heating in the zone, under the arcs. In order to reduce carburization and local overheating of the melt, it was proposed in the Refining Period to turn off the arcs of the right action and at the same time turn on the arches of indirect action burning between the section Mii and the electrode. The ICE causal method is implemented, for example, by measures as follows. lijiji El II3 stainless steel smelting carbon content in the finished rasilav should not exceed u, 0-iVo-11 the furnace is in a quantity of 20 tons, equipped with a number of three-phase combining, 1 ecGyodes, with a transformer of 9 mv.a. After the charge is loaded into the furnace, it consists of carbon waste of the EC type, charge ovolanki, art. 45 MF n nickel grades P-0 and ti-i according to the calculation, clamp the arcs of direct deiS1b, burning between the section of the electrode and the mixtures. Clearing is carried out on the Iolnaya power of the transient transformer, after the race.: The charge charge is carried out during the oxidation period (kip; iron ore and oxygen to the carbon content in the race 0.02-0.03%. Oxidizing slag is downloaded 11 pure. Ha "bare. M1; manganese metal and KycKOBoii silicocalcium are thrown in. The electrodes are raised away from the level of the bath, and the arcs of the irradiated action are switched to arcs of indirect action. The whole further period of refining of the metal occurs on arcs of indirect action that burns between sections. and m) "ombinnirovannogo

electrode and do not have direct contact with the metal. During this period, a new chamotte-lime slag is set in the furnace bath, and the 00000 ferrochrome brand is heated in the heated state. After the ferrochrome is melted, the chamotte slag is pumped up, ferroniobium is sown, and a new slag of lime and fluorspar is made. Slag deacidification during this period is carried out only with aluminum powder. After 10-15 minutes after the introduction of slag, the master alloy and titanium metal are set down, after melting of which metallic calcium is produced in the melt. After holding the melt in the furnace, it is released into the ladle.

The application of the proposed method leads to a weakening of the carburizing process of the liquid metal, reducing the consumption of electrodes and reducing the loss of alloying elements by eliminating local bath overheating during refining with concentrated heat sources, since the latter are located high above the melt level. This makes it possible to improve the quality of the metal being smelted.

Form m l l a and 3 o b r e c) and

Melting method; in an arc furnace with three-phase combined electrodes, three sections of each of which are supplied with currents of different phases, including the melting of the charge by arcs of direct action, the subsequent heating of the bath during the period of oxidation and refining is different in order to reduce Carburizing and local overheating of the melt, during refining, shut off the direct action and odorite arcs and include indirect action arcs, hot, between the sections of each electrode.

Sources of information taken into account in the examination.

1 Barvinsky B.V. “Testing of electrodes with a protective coating on a hundred-ton electric furnace .-“ Electrotherms, 1969, No. 83.

2 P. Okorokov. “Arc steel-smelting furnaces. “Metallurgists, 1971, p. 114-129.

3 Auth. St. L 84692, class H 05B 3/62, “Electrodes for an arc furnace.