SU1199803A1 - Inoculant in form of briquette - Google Patents

Abstract

MODIFIER IN THE FORM OF BRIQUETT containing magnesium, iron and fluorspar, characterized in that, in order to provide a more complete solubility of the briquette in the cast iron and to obtain cast iron with a ball-shaped graphite without bleaching, it additionally contains ferrosilicon with silicon content of 4578 wt.% with a barium content of 15-28 wt.% in the following ratio of components, wt.%: Magnesium 5-15 Iron 20-55 Ferrosilicon (with a silicon content of 45-78 wt.%) 35-70 Hydrofluoric. spar2-5 Silicobarium (with containing (Barium barium 15-28 wt.%) 2-15

Description

 with

00

 one

The invention relates to metal, in particular, to technology for producing high-strength cast iron.

The purpose of the invention is to provide a more complete solubility of the briquette in the cast iron, and the production of castings of nodular cast iron without chill. The limits of CsG Decker in a magnesium briquette (5-15%) are chosen to ensure its high absorption in cast iron and to obtain spherical graphite in cast iron. With a content of less than 5% magnet. modifier, as established by experience, the graphite included in the cast iron has a mixed form, and at a higher (more than 15%) magnes content, the absorption of the modifier decreases.

} Kelaso, (20-55%) in the form of iron powder of the type HK, fine chips or granules, on the one hand, plays the role of a retarder in the PIR solution and evaporation of magnesium, is the refractory component of the briquette, and on the other, as a result pressing the mixture performs the functions of a briquette fixer, forming a solid frame in it. The compactibility of a briquette contributes, along with iron, to a friend, the plastic of a briquette — magnesium — which can be in the form of powder, granules, or shredded chips — is plastic. Moreover, the higher the content of magnesium in the briquette, the less iron can be. The lower limit (20%) of iron is the allowable amount at which the briquette has sufficient strength to use, and the upper content (55%) of iron is limited by the need to introduce graphitizing components into the briquette (ferrosilicon, etc.).

The limits of the content of ferrocylic (35-70%) and silikobari (2-15%) ensure sufficient graphitizing ability of briquettes and are limited only by the necessity of introducing a plastic component (iron, magnesium) into the composition of the briquette to ensure sufficient mechanical strength of the briquette. Fluorspar (calcium fluoride) helps to increase the solubility of the briquette due to the formation of low-melting compounds and increase the absorption of magnesium, also caused by limestone refining effect of calcium J 2% fluorspar is the lower limit at which

rum markedly manifests its marked effect, and the upper limit (5%) is limited by the deterioration of compressibility, briquettes by increasing the proportion in them

5 fluorspar due to the fragility of the latter.

To check the effectiveness of the modified briquettes of the proposed composition, they are tested in

10 compared with briquettes of known composition.

The test results are given in the table (1-4 - the proposed composition, 5 and 6 - the beyond composition, 7 15 lime composition).

In all cases, bezopochnye forms with a vertical connector, in which there were five hull-type castings, were poured. The metal intensity of each mold is 21.7 kg, and the casting time of the molds using an automated casting device is 11-12 seconds. ) It has been established that the briquettes of composition BOB 2-4 are dissolved by the end of the casting of the molds. Briquette 1 does not completely dissolve and the residue is 5% of the initial mass, which is caused by a higher (55%) iron cue. The briquette composition 5 dissolves with a large pyroeffect and is faster than the mold is filled with metal. As a result of low uptake of magnesium and premature disintegration of briquettes (5), the graphite in the cast iron of the castings has a mixed form, the degree of spheroidization (TCC) does not exceed 80%. .

The briquette of composition 6, where a lot of .- leza (70%) dissolves less,

than briquette of composition 1, the residue is 30%. The form of graphite (SSG) is best (90-95%) when processing cast iron with the proposed briquettes (1-4).

Due to the presence of ferrosilicon in the proposed briquettes (1-4), the silico-barium cast iron processed by them does not have carbides in thin-walled castings (section of 10 mm). But in a known briquette (7) that does not contain graphitizing components, cast iron contains 20% carbides.

As the temperature of the iron decreases from 1480 to 1400 ° C, as shown by separate experiments, the compositions of compositions 1–4 completely dissolve in 17–20 s.

31

Considering that the indicated temperature regimes (1400-1480 ° C and the duration of casting the molds (up to 20 s) are most common in the practice of manufacturing engineering castings, modifiers in the form of briquettes of compositions 1-4 are promising with a scoop, in a casting bowl and intra mold). the way they enter into the metal.

998034

When using briquette modifiers of the proposed composition, by eliminating the heat treatment operation (graphitizing annealing) 5 and higher (by 20–30%) their absorption in cast iron in comparison with the known briquettes, the expected economic effect of c6 set et 5-8 rubles. on kahpy ton 10 pour ..

93 Notes.

25

75

20 e: Ferrosilicium with a content of 45-78% silicon} silicobarium with 15-28% barium.

Claims (1)

“MODIFIER AS A BRIQUETTE, containing magnesium, iron and fluorspar, characterized in that, in order to ensure more complete solubility of the briquette in cast iron and to obtain castings with spherical graphite without bleaching, it additionally contains ferrosilicon with a silicon content of 4578 wt.% and silicobarium with a barium content of 15-28 wt.%, in the following ratio of components, wt.%: Magnesium 5-15 Iron 20-55 Ferrosily- tions (with holding silicon 45-78 wt.%) 35-70 Fluffy. spar 2-5 Silicobarium S (with ω low barium 15-28 wt.%) 2-15 but