SU1204640A1 - Metal processing mixture - Google Patents

Description

 . I

This invention relates to ferrous metallurgy and can be used to process iron and steel.

The aim of the invention is to improve the quality of the metal through the micro-alloying of vanadium.

The proposed mixture has the following composition, wt.%: REE oxides 45-35, aluminum 25-30, vanadium pentoxide 30-35.

When using a mixture of this composition, the microalloying process is carried out using vanadium reduced by aluminum from vanadium pentoxide. As a desulfurizer, rare-earth elements (REE), reduced from oxides, and as a modifier-REE, reduced from oxides, and a part of REE oxides, having been in the zone of high temperatures (2000 ° C), act as a modifier. In addition, the formed fine particles AEj: contribute to additional purification of the metal from inclusions.

Oxides of REE and aluminum are used in the form of powder fractions of 0.1-0.4 mm or less. Aluminum plays the role of a REE reducing agent from oxides, and is also a necessary component for the reaction of interaction with an active oxidizing agent, as a result of which the necessary amount of heat required for the reduction of REE is released. Vanadium pentoxide is used in the form of a powder of technical purity (72%) of fractions not more than 0.4 mm.

The lower and upper limits of the components of the mixture are chosen from the need to satisfy the thermal conditions of the reaction to reduce the REE oxides and to achieve a sufficient effect of desulfurization, modification and microalloying.

When the content of REE oxides in the mixture is more than 45%, AR is 25% and 30%, there is a lack of vanadium to ensure the micro-algae process. Prototype Mixture 2

62.0 94.3 16.5. 33.0 1.5 64.4 96.8 17.8 34.0 2.8

204640;

There is also a lack of heat and aluminum to reduce rare earth elements from oxides. When the content of REE oxides is less than 35%, and U., 0 35%

5, the process is rapid, the vanadium yield is above the permissible, and the REE is very low.

The optimal composition is in wt.%: REE 40 oxides; A1 27;

10 33.

In tab. 1 shows the different compositions of the mixture based on REE oxides of the cerium group (RO,), aluminum and.

15 To determine the flow rate and the effect of the mixture on the quality of the metal, when casting rail steel ingots with a mass of 4.32 tons, they tested additive mixtures Nos. 2.3.4 in an amount of 2.0;

20 2.5; 3.0; 3.5; 4.0, kg / t of steel of each mixture, respectively.

 The maximum improvement in properties was observed at a mixture consumption of 3 kg / ton of steel for all mixtures.

25 At the same time, the steel is treated with a mixture of the following composition: AE 21-, MpO 19 (prototype).

The test results are shown in table 2..

30 From tab. 2, it follows that the use of the proposed mixture in comparison with the prototype provides an increase in the mechanical properties of the steel. Table 1

40

27

35

table 2

3

. four

69.2 100.0 64.7 97.0

Continuation of table 2

21.338.5 2.5

18.433.6 2.2.

Claims (1)

'(5'4) MIXTURE FOR METAL PROCESSING, including rare earth oxides (REE), aluminum and an oxidizing agent, characterized in that, in order to improve the quality of the metal due to microalloying with vanadium, the mixture contains vanadium pentoxide in the following ratio of components, wt.%: