SU481644A1 - The method of steel and alloys - Google Patents

Description

(54) MELTING STEEL AND ALLOYS

one

The invention relates to the field of ferrous metallurgy, namely, to a technique for the production of steel and alloys in steelmaking furnaces with a base lining.

There is a known method of smelting alloyed and high-alloyed steel, which means that during the recovery period of smelting, magnesite is added to the fireclay brick battle.

However, the known method requires a large expenditure on smelting magnesite-containing filling materials.

The purpose of the invention is to reduce the melting cost of magnesite-containing (.. refueling and alloying materials, reduce hot idle steelmaking furnaces and improve the quality of the metal being smelted.

This is achieved by introducing magnesite materials into the hearth.

or furnace slopes before charging the charge in the amount of 2-2 O kg / t of the charge and in the filling with slag extraction in the amount of 0.5-10 kg / t.

Decrease in consumption of magnesite

materials for refueling 2–2 kg / tonne of the charge increases the productivity of the furnace and reduces the possibility of metal contamination with difficult to remove exogenous inclusions.

In order to prevent the destruction of the lining in the process of melting the charge and during the oxidative refining of the metal, additional magnesite-containing material is added to the filling with slag-forming materials in the amount of 0.5-10 kg / ton of shed.

Thus, the regulation of the amount of magnesian-containing material, giving ampoule for refueling on the hearth or slopes and filling, makes it possible to stabilize the processes of chemical lining during melting of the charge and in the oxidizing period of melting and reduce the consumption of magnetite-containing materials.

PRI me R. The method was tested in the production of steel grade P6 M5 in an arc furnace with a main liner of coke Q with a cage of 5 tons. 3 refills on the slopes throw 20 kg of a mixture of magnesite J

and im. .

, - ", ja". dolomitic powders and in the filling with slag-forming give an additional 15 kg of bo magnesite brick. Next, the smelting lead on being technology. When more astium is melted, the ichtha metal is blown with oxygen, then the slag is deoxidized and downloaded; I make a new slag of lime, balsamine and magnesite, it is liquefied, and the metal is conducted by chemical composition and the smelting is released.

In pilot melts, the economy of magnesite-containing materials amounts to kg / t, while reducing the duration of refueling by 5-10 minutes per smelting.

481644

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redmet invention

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The method of smelting steel and alloys in main electric furnaces, including the saiorpaB furnace, charge charging, melting, metal blowing with oxygen, deoxidation and finishing, characterized in that, in order to save filling and alloying materials, improve furnace productivity and melt quality (about metal, magnesite-containing materials) the materials are introduced - in the hearth or furnace slopes before filling the charge in the amount of 2-20 kg / t of the charge and with slag-forming in the filling in the amount of 0.5-1O kg / t.