SU367156A1 - - Google Patents

Description

METHOD OF OBTAINING NITRIDE CONTAINING STEEL

one

This invention relates to ferrous metallurgy, in particular to steelmaking.

There is a method of alloying steel with nitrogen, which includes the introduction of nitrogen-containing materials in the production or casting of a metal under a stream. In this case, nitrogen is introduced in the form of stable metal nitrides.

The purpose of the invention is to increase the degree of assimilation of the secondary oxidation of elements to become the oxygen of nitrogen-containing materials, to reduce the loss of heat and heat, and the absorption of materials.

For this, briquettes consisting of nitrate, ferrovanadium and aluminum are introduced into the steel in the amount of 2-6 / sg / t of steel in the following ratio of components, weight. %:

Saltpeter 30-40

Ferrovanadium65-55

ALUMINUM2-8

The briquettes are inserted under the stream flowing from the bucket.

During contact with the liquid metal, the briquettes melt. In this case, the nitrate decomposes to form atomic nitrogen and oxygen. Nitrogen is bound to vanadium and forms nitrides, and nitrate oxygen is bound to aluminum introduced with iron. All these processes take place simultaneously and at one point.

The presence of aluminum in briquettes makes it possible to prevent the secondary oxidation of elements that make up steel and compensate for the expense of heat due to the oxidation of aluminum to melt briquettes, decompose nitrate and dissolve ferrovanadium in steel.

The proposed method allows to increase the degree of nitrogen absorption by steel due to simultaneous participation in the process of vanadium and nitrogen; replace expensive nitrided ferroalloys with a more common material - nitrate; eliminate the secondary oxidation of elements in steel with oxygen of nitrate due to oxidation of aluminum introduced with briquettes with this oxygen; to compensate for the costs of heat for the heating and decomposition of components of briquettes, as well as to reduce the dustiness and pollution of the atmosphere with powder-fed materials introduced into the steel.

Subject invention

A method for producing nitride-containing steel by introducing nitrogen-containing materials, alloying nitride-forming elements and deoxidizing agents under the jet of liquid metal, characterized in that, in order to increase nitrogen absorption and alloying nitride-forming elements, reduce heat losses for heating and assimilation of 3 materials introduced in the amount of 2-b / sg / g of steel in the form of briquettes of the following composition, weight. %: 367156 4 Salitra30-40 Ferrovanadium65-55 Aluminum2-8