SU901326A1 - Modifier - Google Patents

Description

(54) MODIFIER

t

This invention relates to the metallurgy of alloys, in particular to modifiers used to produce high quality cast irons.

Known modifier for cast iron containing rare earth metals (SEM), yttrium, aluminum, silicon, calcium, carbon, boron, iron 1.

This modifier does not provide cast iron for thin-walled castings with high casting and mechanical properties.

The closest to the invention in terms of the essence and the effect achieved is the modifier (21, containing, wt.%: Carbon 10-30

Silicon 20-40

Aluminum6 -12

Calcium1-3

Yttrium3-6

RZM6-12

IronErest

The application of this modifier, o & сп, makes a stable modifying effect and high properties of cast iron in castings, especially at low temperatures of pouring N; Along with this, the high aluminum content does not allow it to be used for the treatment of cast iron, which is poured into raw forms, due to the formation of sieve porosity on castings. The presence of yttrium in its composition, which increases the casting of iron to chill, also makes it difficult to practical triple for modifying doped iron.

The purpose of the invention is to increase the strength,

To homogeneity of the structure and degree of graphitization of cast iron.

The goal is achieved by the fact that the modifier containing silicon, carbon, aluminum, calcium, rare-earth metals contains components

IS in the following ratio, wt.%:

Silicon45-70

Carbon 20-40

Alkumshy0.5-2.5

Kalyshy0,1-1,5

20

RZM4-9

IronErest

The limit of the content of elements in the proposed complex modifier selected

at the rate of obtaining the maximum graphitizing effect in the processing of gray chromium cast iron.

Introduction to the melt of such graphitizers. like carbon R silicon, it sharply increases the activity of carbon and causes microscopic graphite Xyuxes from the liquid phase. The nebulous amount of chemically active metals, such as rare-earth metals, calpium and alkali, aepasytBft in the melt of oxen 1, its flexible carbides, catholes of graphite complexes, and thus provide a strong and steady increase in the degree of graphitization, and thus provide a strong and steady increase in the degree of graphitization, and thus provide a strong and stable graphite complex, and thus provide a strong and steady increase in the degree of graphitization, and thus provide a strong and stable increase in the degree of graphitization, and thus provide a strong and steady increase in the degree of graphitization by means of graphite complexes, and thus provide a strong and steady increase in the degree of graphite

The correlation between the limiting contents of graphs of carbonating (carbon, silicon) and HYM1RUCKY active (REM, aluminum, and calcium) elements in the proposed complex modus and feat is at least 5: 1. causes its high modifying ability. Along with this, the duration of the modifying action is increased by holding liquid iron in comparison with the similar indicators for a known modifier.

Another advantage of the proposed complex modifier is its high efficiency in the wide range of temperatures of liquid iron within the range of 13-20-1450 0, which is determined by the joint graphitizing effect of carbon (at high temperatures) and silicon (at low temperatures). When using the proposed complex mod (C) Ikator for the treatment of liquid iron (see table), a high graphitizing effect is obtained. A significant reduction in the tendency to chilling, alignment of the structure over the cross sections of the casting of various TOLSHI and increase in strength is achieved compared to the same values obtained using the known modifier.

The complex modifier can be used both as an alloy and as a mechanical mixture containing all the components of the proposed composition.

7901326g

Claims (1)

The invention of aluminum 0.5-2.5 Modvfmkator containing silicon, carbon. Rare-earth Alymsh, kalya1y, rare-earth metal metals.4-9 and iron, characterized in that, $ Iron Else B purpose of strength, uniformity sources of nfsfmashga, the structures and degrees of graphitization of cast iron, and taken into account during the examination  components in the following ratioshe-1. Authorship certificate of the USSR No. 417521, Research institutes, wt.%: Cl. C 22 C 35/00, 1972. Cream i45-70to 2; USSR Authorship Certificate fP fl81035, Angle rtd20-40, class C 22 C 35/00, 1979, "F- Calcium0,1-1.5