CS259223B1 - Silicon modification admixture on base of globulization and anti-globulization elements - Google Patents

Abstract

The solution relates to a modification additive for the production of high quality worm cast iron graphite. The nature of the modification The additive consists of containing 5.0 to 6.0 wt. Mg, 4.0 to 5.0 wt. Those, 0.4 to 0.5 wt. Ca, 0.2 to 0.3 wt. Ce, 0.7 to 0.8 wt. %, 45 to 50 wt Si.granulation composition 3 to 5 mm.

Description

The invention relates to a silicon modifying additive based on globulization and antiglobulization elements for the production of worm-like graphite cast iron.

Worm graphite cast iron is in most cases produced using modifiers based on unseparated lanthanide complexes. The modification technology of this modifying additive to the liquid metal stream is unpretentious. The basic disadvantage of these modifiers is that they contain a relatively high percentage of expensive and deficient elements such as La,

Ce, Pr, etc.

The above-mentioned drawbacks are overcome by the silicon modifying additive according to the invention, which comprises 5.0 to 6.0 wt. % Mg, 4.0 to 5.0 wt. Ti, 0.4 to 0.5 wt. Ca, 0.2 to 0.3 wt. Ce, 0.7 to 0.8 wt. Al, 45 to 50 wt. Si granulation composition 3 to 5 mm.

The amount of graphite to worm-like modifying additive added depends primarily on the sulfur content of the liquid cast iron. With a sulfur content of the starting melt of 0.017 to 0.020 wt. it is necessary to add 1.1 to 1.6% by weight in order to obtain an 80 to 95% proportion of worm-like graphite in the iron structure. % of the silicon modifying additive at a granulation of 3 to 5 mm, the concentration composition of the individual elements being as follows: 5.6 wt. mg,

4.20% wt. Ti, 0.46 wt.% Ca, 0.26 wt. Ce, 0.72 wt. Al and 49.8 wt. Are u. The optimum effect of the silicon modifying additive according to the invention is in the wider range of addition and also the residence time of the modifier. reverberation effect is significantly higher - about 20 min after modification.

The modification additive according to the invention is produced from magnesium and master alloys based on silicon, titanium, calcium and aluminum. The main benefit of this modifying additive is a more economical way of obtaining worm-like graphite cast iron, while providing deficient metal savings, a wider modifier exposure interval, and improved reproducibility of the results when the modified melt weight fluctuates. Another important advantage is the extension of the optimum exposure interval, which is associated with greater operational reliability and increased reproducibility! results.

The modification additive according to the invention can be used in engineering technology.

Example 1

Chemical composition melt: 3.43% wt. C, 2.68 wt. Si, 0.22 wt. Mn, 0.018 wt. P, 0.020 wt. S, modified at 1450 ° C in a ladle by dip-bell method with a silicon modifying additive based on globulizing and antiglobulising elements having the following chemical composition: 5.6 wt. Mg, 4.20% wt. Ti, 0.46 wt. Ca, 0.26 wt. Ce, 0.72 wt. Al, 49.8 wt. Are u. Addition amount of silicon modifying additive 1.2 wt. with a granulation composition of 3 mm. After modification, the melt was grafted with ferro-silicon in an amount of 0.7% by weight.

Metallographic evaluation: 90% III, 10% Vl-Pe 80.

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Mechanical properties: Rm = 449 MPa, KG = 20.1 J.cm, HB = 201.

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Example 2

Chemical composition melt: 3.52% wt. C, 2.7 wt. Si, 0.22 wt. Mn, 0.01 wt. P, 0.019 wt. S, modified at 1450 ° C in a ladle by the dip-bell method with a silicon modifying additive based on globulizing and antiglobulising elements having the following chemical composition: 5.3 wt. Mg, 4.4 wt. Ti, 0.48 wt. Ca, 0.26 wt. Ce, 0.78 wt. Al, 47.6 wt. Are u. Addition amount of silicon modifying additive 1.25 wt. with a granulation composition of 3 mm. After modification, the melt was grafted with ferro-silicon in an amount of 0.7% by weight.

Metallographic evaluation: 90% III, 10% VI-Fe 85.

Mechanical properties: Rm = 456 MPa, KG = 21.2 J.cm ² , HB = 198.

Claims (1)

OBJECT OF THE INVENTION Silicon modifying additive based on globulization and antiglobulization elements for the production of worm-like graphite cast iron, characterized in that it contains 5.0 to 6.0 wt. % Mg, 4.0 to 5.0 wt. Ti, 0.4 to 0.5 wt. Ca, 0.2 to 0.3 wt. Ce, 0.7 to 0.8 wt. Al, 45 to 50 wt. Si granulation composition 3 to 5 mm.