SU395386A1 - METHOD OF MELTING STEEL IN THE HEAD - Google Patents

Description

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The invention relates to ferrous metallurgy, more specifically to the production of steel in hearth steelmaking furnaces.

The limestone- method of forming steel in hearth furnaces, including the melting of the metal using roof heaters and refining of the melt by blowing it with an oxidizing gas. However, in the known method, considerable dust formation is observed at intensive purging of the melt with oxygen and the decarburization rate in the hearth furnaces is not high enough.

The purpose of the invention is to intensify the process of steel refining in hearth furnaces and improve its quality.

This is achieved by the fact that the melt obtained in the furnace is fed in separate portions into a vacuum, evacuated, purged with acid, gas and periodically released from the furnace into the furnace. At this m, doping and deoxidation are carried out in vacuum; the first chamber.

CinocOi6 steel heads are as follows.

The metal is melted in a furnace equipped with fired burners and vacuum chambers. After melting, the metal from the vaine is sucked into the vacuum chamber through the lined pipeline. Simultaneously with the filling of the 1M chamber, the metal is purged with oxygen through an unmounted / visuar fume, BMOIgovirNPu to the dome of the 1st chamber. Blowdown is carried out at a maximum discharge of over 35 cm. . min.) The gases (carbon monoxide) released during the pro- duction (by the blower) are burned into the chamber cavity. During decarburization, the pressure in the chamber is maintained not at 100 mmHg. Then the chamber is disconnected from the air; the gas | Because of this, the pressure in the chamber becomes higher than atmospheric, and the metal is squeezed into the bath, while simultaneously with the vacuum: the opposite ger: metallic} 1st chamber is connected to which the first portion of the metal is drawn in an amount not less than the total weight of the steel in the furnace. Since} from one metal gauge It is compressed, and the second is sucked in the bath, it is aggravated: D: 1511 metal shedding, which helps leveling the composition and temperature. By alternately blowing metal in hermetic chambers, carbon burnout and metal heating can be significantly accelerated. The order of operation of the chambers on carbon is changed. In the chambers, only vacuuming is performed while simultaneously heating the metal using a source of known structure. If necessary, reduce the carbon content below 0.05-0.06%

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the metal is purged with a mixture of argon and oxygen through the Ceramic Blocks. After a short break, kuA1IrO | WahNi, the metal is alkalized and alloyed. For individual cases, in some cases, slurry can inflate gas mixtures blown into the metal in the BaiKy iMiioi i chamber at pressures below 100 mm rg. Art. The metal is produced in the usual way through a tap-hole or through a va (Quum1 chamber. The issue through vortex cells has a number of technological advantages, in particular, dosing and filling with several buckets of lesser capacity, such as three or five, by adjusting the level of the metal: H metal in Kammer, which .0031 allows to increase the load, did not increase: Ichi / va crane capacity.

We offer you a new way to shorten the duration of fluorite, to increase the kiln’s campaign — between repairs and repairs.

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by suppressing deposits, expanding the assortment of marten with steel and increasing its quality.

PRE D MEET and 3 o breteni

1. The method of steel smelting in the hearth furnace, including metal dissolution with the help of vault fuel-to / hydrogen burners,

characterized in that, in order to intensify the process of refining steel and increasing its quality, but the melt in the furnace is separately fed in an oven into a vacuum chamber, vacuum, oxidize; gas and per-iodically released from the chamber into the furnace.

2.CinccG: 6 but also. 1, characterized in that the alloying agent and the deoxidizing agents are introduced into the melt in a vacuum.