DD275823A1 - METHOD FOR THE CONTINUOUS GASIS OF HIGHLY RESISTANT MAGNESIUM-CONTAINING CAST IRON - Google Patents

Abstract

The invention relates to a method for the continuous casting of high-strength magnesium-containing cast iron, which comprises the introduction of a molten cast iron into a metal receiving vessel, the magnesium addition to the cast iron melt, the forming of a strand in a mold and the strand withdrawal from the mold. The object is to achieve a highly achievable uniformity of the physico-mechanical properties of the cast iron over the entire strand length and to allow the automatic magnesium feed into the molten cast iron according to a predetermined program. According to the invention, this is achieved by continuously feeding magnesium in a steel shell into the molten cast iron at a rate which will ensure a magnesium content of from about 0.03 to about 0.06 mass% in the molded strand material.

Description

it is determined

P - the average output of the strand draw, kp / s; q - the magnesium mass per 1m shell, kg / m;

T - the temperature of the molten cast iron in the metal receptacle, K; S - the sulfur content in the starting cast iron, Ma .-%; 2 · 10 ⁵ - a proportionality factor taking into account the argument dimensions; mean.

3. The method according to claim 1 and / or 2, characterized in that in a Gußeisenzufuhr in subsets the Teilmengenmasse is selected starting from the condition that in the material dos shaped strand of about 0.03 to about 0.06Ma .-% magnesium are.

4. Process nor Ansprich 1, characterized in that a low-carbon steel strip having a thickness νυη about 0.2 and about 0.45 mm is used as a steel shell.

Ar., Of the invention

The invention relates to a method Zürn continuous casting of high-strength magnesiumhclt '| em cast iron and, in the May3,'<- ~ be used inlagen of cast strands from hochfeitem cast iron on Gußeisen3tranggul iv ^r production. Beson if.rs effective know the erfindunpsgomfißa process in the production of Rohl, igen for hydraulic and pneumatic equipment parts are used with increased demands on the strength and plasticity properties. At present, magnesium and its alloys are used throughout the world in the mass production of castings of high-strength cast iron for the formation of spheroidal graphite in the cast iron structure.

Characteristic of the known state of the art A process is known for the continuous casting of high-strength magnesium-containing cast iron in which magnesium-containing Cast iron in the metal receptacle of a cast iron casting plant under the layer of a on the surface of the greasy Cast iron containing 20 to 30% magnesium chloride containing protective slag in part quantities (StJ, By this method, a stable Gowinnung the physico-mechanical properties with a high Degree of uniformity in Gußbtrang not guaranteed during the continuous casting, because during the holding time of the Melting a Magnosiumabbrand takes place. In addition, in this method, the atmosphere of the atmosphere by pollutants due to the chlorine excretion from the Magnesium chloride contaminated at high temperatures. Moreover, this process can not be automated because it involves such operations as melting the Debris, crushing, storage and dosage of Magnosiumzusätze and slag is connected, which is not

automate.

It is also a process for the continuous casting of high-strength magnesium-containing cast iron (Academy of Sciences

The Ukrainian SSR, Klov, Lvov, 1977, X.Unionskonforenz über hochfestos cast iron, short lectures, pp. 110 to 111) known, which consists in that in a Metallaufnahmegofäß liquid magnosiumhaltiges cast iron is filled to spherical graphite in

Structure of the Gußelsenstränge nusbildon to be able. In the case of molten, thin-walled cast iron in the metal receptacle, its contact with the atmosphere leads to it Magnesium _burnup according to the reaction Mg _01n ^ + - -0 = MgO. In Ergbbrii, the amount of Magnosium in the fungus steadily decreases, thus reducing the metal's Fostlgkeltselgengenschaften

deteriorated, ihro large unevenness over the strand length caused during the continuous casting process

Outside of this process, the change in the magnesium content in the Gußolson (magnosium burn-up) boi soinom becomes apparent Haiton not included under high temperature.

As a result of the burn-off of magnesium, its content decreases, and upon reaching a certain minimum allowable amount under given conditions (less than 0.03%), the graphite does not crystallize in a spherical form, but in a form of lameia. h., A gray cast structure is formed.

The strength properties of such cast iron change significantly on the strand length (from the properties of the high-strength cast iron to the gray cast iron properties).

In addition, this method requires that the magnesium additives be crushed, stored and dosed in liquid cast iron, which can not be automated.

Process for the desulfurization of cast iron by injection of a magnesium powder by means of gases (N.A. Voronova, Desulfurization of Cast Iron with Magnesium, 1980, Metallurgy, Moscow, p. 02) are well known.

In these processes, powdered magnesium can be introduced into the molten cast iron in order to form spheroidal graphite in its microstructure.

However, these methods are practically not applicable to the continuous casting of high-strength magnesium-containing cast iron because they require large cast iron masses.

In order to avoid a risk of accident when conducting the continuous casting process to vs.v.un, the metal spoiler height in the pickup vessel above the mold should be within limits of 300 to approx. warden.

When the blow mold is immersed in the melt for magnesium injection into such a depth, the coefficient of magnesium uptake by the molten cast iron melt is very low (less than 15%).

With a continuous casting rate in excess of 9.5kp / s, a large magnesium and gas consumption is required, causing metal chippings from the metal receptacle and degrading operator working conditions.

In addition, magnesium injection into the cast iron melt is associated with compiled technological operations.

There is also known a method for continuously casting high-strength magnesium-containing cast iron (SU, A, 544063), in which magnesium-containing cast iron is periodically fed into a metal receiving vessel, a strand is formed in a mold and withdrawn from the mold.

In order to be able to ensure a stable quality of the strand material, the magnesium content in the cast iron to be replenished is increased by 0.01 to 0.1% by mass in preference to the viscosity of the casting which remains in the metal receptacle at the time of refilling. At the same time, the magnesium content in the end of the casting is reduced by the ratio

AM ₉ -UP ₁ + Pi)

determines, in what

Mg ₂ - the magnesium content in the cast iron, Ma .-%;

AMg - the magnet iumabbrand in the metal receptacle per unit time,%;

t - the time interval between two successive refills;

P ₁ - the mass of the cast iron remaining in the metal receptacle at the time of refilling;

P] - the mass of the cast iron to be replenished;

Mg, - the magnesium content in the cast iron remaining in the metal container at the time of refilling, Ma .-%

mean.

However, the use of this method of continuous production of cast strip of high strength cast iron causes the globularization effluent due to the magnesium burn-off to be attenuated over time as the magnesium-containing cast iron cools, and as a result, the strength properties of the cast strands are degraded. Depending on the profile of the strand to be withdrawn and its wall thickness, Jia varies casting performance within wide limits, and in connection therewith, the refilling time for the subsequent aliquots of the magnesium-containing cast iron varies widely and may be 0.5 dogg. During this time, the magnesium erosion reaches a high value. Because of this, the cast iso-sono-blends in the strands created before and after the refill are very uneven and strongly different.

Consequently, it is virtually impossible to produce a strand having a highly achievable uniformity of properties over the length of the strands to be drawn during the continuous casting process.

In addition, in the pan treatment of the replenished Gußeisenteilmengen with magnesium a Pyroeffokt, whereby the hall atmosphere was contaminated by harmful gases and the working conditions for the operator were deteriorated.

Due to the magnesium content in the strand material, the solidification properties of the metal are determined in addition to other parameters. At a magnesium content in the strand material below 0.03Ma .-% Nehmon dio strength values sharply. In addition, when using this method, operational control of the residual mass of the magnesium-containing cast iron in the transfer vessel, the magnesium contents therein, the mass of the cast iron toilet block to be replenished and the amount of magnesium therein, as well as the comminution and metering of the Magnosiumzqlekto are required. Dieso operations do not allow automation of the process.

Object of the invention

Ziol the invention is to improve the working conditions for the operator in the continuous casting of high-strength magneslumhaltlgom cast iron.

Explanation of the essence of the invention The invention is based on the object in the continuous casting of high-strength magnesium-containing cast iron, which Introduction of a molten iron melt into a metal receptacle, the addition of magnesium to the molten cast iron, the molding

a strand in a mold and the strand withdrawal from the mold includes, to ensure such a quantity of magnesium in the material of the molded strand that the strand to be deducted with a highly achievable strand

Uniformity of physical-mechanical properties over the entire length during the withdrawal process

produced and eint cutcn.-Atische magnesium supply into the cast iron melt according to a planned program allows

According to this, this is achieved by continuously feeding magnesium in a steel shell at a speed

by which a magnesium content of about 0.03 to about 0.06% by mass in the material of the molded strand is ensured.

The rate of magnesium supply expediently depends on the dependence

w PT-VS ,

certainly, in d. rr

V - rf! S rate of magnesium addition into the cast iron melt in the metal receptacle, m / s; P - the average output of the strand draw, kp / s;

q - the magnesium mass per 1m shell, kg / m;

T - cast irons * in natural metal receiving vessels, K; S - denSc ^ .. VareigehaltimAusg3ngsgusseisen, Ma .-%;

2 · 10 ^s - a proportionality factor that takes the argument dimension into account.

In a üuäeiseniufuhr in subsets, the partial mass is expediently a.isgehend from the condition

chosen that in Wt.'r.tof; of the molded strand of from about 0.03 to about 0.06% by weight of magnesium.

Conveniently, a low carbon steel strip having a thickness of 0.25 to 0.45 mm is used as a steel shell. The orphenungspemäßö ancestor allows casting strands of high strength cast iron with a high degree

achievable uniformity of the dielectric properties throughout the continuous casting process.

This is achieved by adding magnesium to the molten cast rock continuously and simultaneously with the supply of the Starting iron is supplied, whereby the losses of magnesium are supplemented, which in its combustion during the Holding time of the molten cast iron arise, as well as the required magnesium absorption by the cast iron in the

specified area is ensured.

The magnesium content in the strand and the strength properties of the metal (hardness - HB, strength limit - 6b; Elongation - 6,%; average magnesium absorption by the cast iron - a) are practically at a given height

throughout the casting process.

By the method according to the invention it is made possible:

- to automatically feed magnesium into the cast iron melt in the metal receiving vessel according to a predetermined program;

- exclude crushing and dosing of magnesium-based alloys; 'a de-modi'^; prevent damage;

- maintain the magnesia content in the strand material at a specified level;

- substantially improve the working arrangements for the operators;

- to increase the quantity of oil on the agrade by the cast iron.

The improvement of the Aib * conditions by the method according to the invention is achieved by reducing the size

and the dosage of the reagents to be introduced is excluded, the magnesium supply is automatically made with the possibility of a wide variation of the introduction rate.

In addition, ciia magnesium reaction with the cast iron from a low light and Rauchentwic '. "Ng at the expense of

accompanied, because the StahlhOlle of the powder wire dissolves mainly in the ground near the metal receiving vessel, whereby the Magnesiumdämpfo to cover the maximum way through the melt.

Through the steel hut, an interaction of the powder wire components with the atmospheric oxygen is prevented, whereby the Absorption of the modifying elements of the shell is improved by the melt. The steel shell can not be filled not with a single, but with several carefully mixed modifiers

have been achieved, whereby a combined effect in the treatment of the molten cast iron is achieved and consequently the ability test ent to obtain the material of the cast strand with a predetermined structure and predetermined properties.

As a result, the method of the present invention allows a wide range of high quality castings to be obtained

Mbe performance characteristics (tensile strength [δ _Β | - 450 to 700 MPa, hardness [HB] -180 to 240, relative elongation - | 6% |) -3bJ3 10 have.

By vorformed in erfindungsgomäßon ancestor for the formation of nodular in Gußoisonrjefüge reagent in the form

from Pulvsrmagneslum in a steel casing, soino continuous feed into the cast oison melt is allowed until the

Magnoslumresim-nnn In the metal of about 0.03 to about 0.08Ma .-% is. The steel cover serves as an "eye-sight"; ί ·> Msgneslum. Through the steel shell is a contact of the Magnbsiums with the atmospheric oxygen

Prevented and the maximum Magneslumaufnahmo favored by the cast iron.

Dor use of olnem other material, such as aluminum, Kupfor odor deron alloys, as a shell for the wire

ineffective, these materials and the cast iron wanted to make a big difference in the melting temperature. These

Hüllon was melted in the upper layers of liquid cast iron, causing oino interaction of magnesium

With the GuRoisen & chmelzs taking place on their surface, a significant magnosium burns up, a stormy one

Reactioi and outbreaks of the liquid metal are caused from the metal receptacle. The optimum magnesium content in the cast iron of the strands should be from about 0.03 to about 0.06Ma .-% (depending on the Wall thickness of the strand, the Abkühlgeschwindigkelt and other factors) amount. With a Magnesiumgehait In strands under C, 03Ma .-%, the graphite does not crystallize in a sphere, but in lamellar form,

d. h., A gray cast iron structure is formed. The surface properties of such cast iron are severely degraded.

At a magnesium content in strands over 0.06Ma .-% cracking occurs in the cast iron, which leads to the committee, and the Strands have an excessively high hardness, which requires their heat treatment. In order to achieve a MagnesiumgehaU in the cast iron of the strands in a range of about 0.03 to about 0.06Ma .-%,

For example, the speed of the powder drip introduction is expediently dependent on the dependence

2-10 ⁶ q determined in the

V - the rate of magnesium introduction into the cast iron melt, m / s; P - the average output of the strand draw, kp / s;

q - the magnesium mass per 1 m of casing, in kg / m;

T - the iron temperature in the metal receptacle, in K; S - the sulfur content in the starting cast iron, in% by mass;

2 · 10 ^s - a proportionality factor that takes into account the argument dimensions.

This dependency combines the most important technological parameters of continuous casting of high-strength cast iron, such as magnesium wire feed rate, continuous casting power, temperature of the metal to be treated, its composition (sulfur content) and magnesium mass per unit wire length. An increase in temperature of the cast iron to be treated and an increase in the sulfur content in the cast iron and the casting performance led to a higher magnesium consumption for the spheroidal graphite formation in the structure of the cast iron strands. The magnesium introduced into the liquid cast iron is distributed in the following manner:

0.M ₈ M. + ° .MgOi

qMj - the Magnijsiommengo introduced into the liquid cast iron;

the amount of magnesium bound by sulfur and removed from the melt along with sulfur;

the amount of magnesium that remains in the melt;

the amount of magnesium consumed for the foundry iron oxidation.

To provide the technological process for the production of cast strands of high strength cast iron with a high degree

To be able to provide achievable uniformity of the strength properties over the strand length, the regularity of the quantitative magnesium distribution in the melt should be set.

With the increase in temperature of the liquid cast iron during the introduction of magnesium in this takes the Floating speed of the magnesium bubbles too. Here veigrößer, ¹ the probability of their discharge from the Melt, i. a magnesium burn. Due to countless experiments, a dependence was derived according to which the magnesium intake per 11 molten cast iron

0.75 to 2.5kg. This amount of magnesium is sufficient to produce, in the molded strand material, from about 0.03 to about 0.06Ma.% Of magnesium depending on the casting performance, the temperature of the molten cast iron, the

To be able to obtain sulfur content in this and the magnesium mass in the powder wire. For a stable formation of nodular in cast iron structure, which is intrinsic to the high-strength cast iron, the optimum Magnesium consumption in cast iron treatment temperatures used in the foundry industry (1500 to

1600K) and the sulfur content in the metal (0.01 to 0.08Ma .-%) of about 0.75 to about 2.5 kg per 11 of the cast iron to be treated.

The determined according to the stated dependence speed of magnesium supply allows strands with a

to achieve a high level of uniformity of strength properties.

In a Gußdisenzufuhr in Toilmengen in the Metallaufnahmegofäß the partial mass is expediently

starting from the condition that the strand contains from about 0.03 to about 0.06 mass% of magnesium.

As a result of a deviation from this condition, the stability of the process is adversely affected, the degree of uniformity

the quality of the properties of Gußstr / inno is impaired and its quality deteriorates.

Such a measure can be narrated in the form of cast-iron melody, given the relation

0.06 »^ 0.03 m + mi

vorwondot.wo-in

m - the mass of magnesium containing cast iron in the metal working vessel at the time of refilling the

Initial cast iron in this, in kg;

Mg - the amount of magnesium in magnesium-containing cast iron. ioma .-%; π, - the mass of the gray cast iron to be refilled into the metal receptacle, in kg.

This is a strand of high strength cast iron with a reachable in hohnm grade uniformity of Strength properties produced over its length during the entire casting process. Appropriately welse is a low-carbon steel strip with oinne thickness of 0.25 to 0.45 mm as a steel shell for the Powder wire used. As mentioned above, magnesium is maximized by the use of the steel casing as it is introduced into the cast iron melt

exploited. This is achieved by the fact that the powder wire in the determined by the specified dependence

Introducing speed mainly dissolves in the ground-level area of the metal receptacle. When using a steel sheath for the wire with a thickness of less than 0.25mm it dissolves in an insufficient immersion depth in

the melt, which increases the burn-up of magnesium and its absorption is impaired by the liquid Gußeison.

When using a steel shell with a thickness above 0.45 mm is required for their dissolution in the cast iron that the height of Metallic liquid in the metal receiving vessel is increased, causing the ferrostatic pressure on the in the mold too

forming strand is increased and the solid strand crust can be broken at Kokillenaustritt, i. a

Havariegefahr may arise. To avoid this, the casting performance is to be reduced, which results in unacceptable cooling of the metal. Ausführungsbelsplol The invention will be explained in more detail below with reference to some examples. The method of continuously casting high-strength magnesium-containing cast iron according to the invention is as follows

carried out.

In melting furnaces (electrofusion or cupola furnaces), gray cast iron of a given composition is melted. Then the molten cast iron is poured into a magnetodynamic pump or other device from which the Melt in the metal receptacle of a plant for continuous casting of cast iron continuously or in portions

is supplied. The mass of the poured into the metal receptacle cast iron is a function of the

Continuous casting performance selected. In addition, the method of the invention can be carried out by the molten cast iron from a melting furnace

in the metal receptacle with a transport pan is added in portions.

In order to produce a cast iron strand with the strength value, which are characteristic of the high-strength cast iron, should irn Metal structure spheroidal graphite are formed. To form the spheroidal graphite in Gußeisengefüge powdered magnesium in a steel shell is continuous

fed. The rate of magnesium feed is chosen so that the shaped strand of otwa contains from 0.03 to about 0.06 mole percent magnesium.

In order to be able to achieve the stated magnesium content in the strand, the speed of the introduction of the powder wire is reduced

the dependence

.. PT- VS.

V = ~ - m / s

2-10 ^s -q

fet is right, in which

P - the average power of the strand discharge, in kp / m;

cj - the magnesium mass per 1 m shell, in kg / m;

T - the temperature of liquid cast iron In the metal receptacle, in K; S - don sulfuric acid in the starting cast iron, in%;

2 · 10 * - a proportionality factor that takes into account the argument dimensions.

The ratio quoted makes it possible to identify the most important technological parameters of the process for the production of Casting strands of high-strength magnesium-containing cast iron (casting capacity, temperature of liquid cast iron, Sulfur content in the cast iron and magnesium in the powder wire) and a magnesium content of

about 0.03 to about 0.06Ma .-% in the material of the molded strand to achieve.

Thereby, a highly attainable uniformity of the strength properties of the strand during the

achieved throughout the continuous casting process.

BoI of a portionwoison supply of molten cast iron into the Motaillaufnahmogofäß is starting the Teilmongonmasse

from the condition chosen that the strand of otwa 0.03 to otwa 0.06Ma .-% magnesium.

This condition ensures that in the strand Kugelgraphltgefügo with a hohon degree of uniformity of Festlgkoltsoigonschafton währond the entire continuous casting process is formed. The angogobone Magneslummongo In dor Gußoisenschmolzo is achieved, considering the ratio

mi · Mg

0.00 > - ^! * -> 0.03

ni + m

used in which

mi - the mass of magnesium-containing cast iron in Metallaufnahmegefä B to τι time of refilling dos

Starting Casting Iron In this, In kg;

Mg - the amount of magnesium in the magnesium-containing cast iron, in% by mass; (Tij - the mass of gray cast iron refilled into the metal receptacle, in kg.

As the steel sheath for the powder wire, a low-carbon steel strip having a thickness of 0.25 to 0.45 mm is used. Thereby

an interaction of the magnesium with the molten iron in the Bodonnahcn area of the Metallaufnahmegefäßes is ensured during the wire feed into the molten cast iron.

At the same time the way of the magnesium bubbles through the melt is maximal, their exit ir. The atmosphere is minimal, and therefore

the magnesium burnup is reduced. The working conditions for the operator are improved.

When using a steel shell with a thickness of less than 0.25 mm, it dissolves in an unsatisfactory immersion depth in the melt

which increases the burnup of magnesium and reduces its absorption by the liquid cast iron.

When using a steel shell with a thickness above 0.45 mm is required for their dissolution in the cast iron, the height of Liquid metal acid in the metal receptacle to enlarge, resulting in a higher ferromagnetic pressure on the in the mold

strand to be formed and the breakthrough of the solid strand crust at Kokillenaustritt, d. H. leads to the emergence of a Havariegefahr. In order to avoid this, the casting performance is to be reduced, which results in unacceptable cooling of the metal.

The technical-economic characteristics of the method according to the invention according to SU-544 063, such as the degree of uniformity

The strength properties, the magnesium content in the strand material, the magnesium absorption by the cast iron, the amount of magnesium introduced into the cast iron are determined as follows.

The degree of uniformity of the strength equations is determined by testing the extrudates which are determined in particular Time intervals have been taken during the casting process. The magnesium absorption by the cast iron is determined by the expression

_{a =} Mg _n ...- H 0.76 (S ₁ -S ₂ )

determines, in what

a - the magnesium uptake by the cast iron, in%;

0.76 - the ratio of the atomic masses of magnesium and sulfur to each other;

Si - the sulfur content in the cast iron before introducing magnesium into it, in% by mass; Sj - the sulfur content in the cast iron after the introduction of magnesium into it, ir. Q - the amount of magnesium introduced into the liquid cast iron (magnesium consumption), in%; MgR ₁₁₁ - the amount of magnesium remaining in the cast iron melt, in% by mass,

mean.

The amount of magnesium (magnesium consumption) introduced into the cast iron is expressed after the term ^ 100%

determines, in what

V - the speed of the powder wire feed into the liquid cast iron, in m / s;

q - the magnesium mass per 1 m of casing, in kg / m;

P - the withdrawal rate, in kp / s;

mean.

The residual content of magnesium in the strands is determined by a chemical or spectral analysis of the strand samples. In this way, the degree of uniformity of the strength properties is substantially increased by the method according to the invention, the operating conditions for the operating staff are improved, the amount of magnesium introduced into the melt is reduced and automatic process control according to a predetermined program is made possible. The method of the invention does not require large expenditures for additional equipment and materials, no additional space. The use of this method reduces the number of employees and reduces the energy consumption of molten cast iron, because the metal overheats for the magnesium supply in it. For a better understanding of the present invention, concrete exemplary embodiments a! The technical-economic characteristics of the erfindungsgemäon process (Glelchmäßlgkeitsgra d the Fostigkeitgensqualities, magnesium content in the strands, Magnesiumaufnahmograd by the cast iron, the magnosium introduced into the cast iron), which were achieved in soinor implementation according to the following examples 1 to 13, in dor to the Beispiolo following table. The same table contains information on the strength, hardness and relative elongation of the Strfingo from high-performance cast iron throughout the whole-strand casting process. Outside the same Tabello are the technical-economic characteristics of the method according to SU-A. 544,063, in the course of which, according to the Boisplolon, 14 to 15 orcsiol, and details of the strength, hardness, and elongation of the strands of high-performance cast-oil were used for comparison.

example 1

A magnesium powder wire is fed in a metal receiving vessel with a cast iron melt of the following composition, based on Ma .-%: carbon-3.8; Silicon-2,3; Manganese 9.3; Sulfur 0.05; Phosphorus 0.08; Iron residue.

Withdrawal rate P-1 kp / s;

Temperature of the molten cast iron in the metal receiving vessel T = 1500 K;

Thickness of the powder-wire steel sheath-0.4 mm;

Magnesium wet per 1 m sheath - 10 g / m (0.01 kg / cm);

Speed of powder wire entry into the cast iron melt

2-1O ⁵ -0.01 Magnesium consumption Q ° ^ j * - 100% = ₁₀₀ = 0.168% or 1.68kg / t cast iron.

Ferrosilicon in the amount of 0.4% of the cast iron mass was introduced into the cast iron melt in parallel with the magnesium feed.

The discharge iron was fed into the metal receiving vessel from a 3000kg capacity magnetodynamic pump in a continuous stream in an amount of 1kg / s.

The molten cast iron was fed from an induction furnace to the magnetodynamic pump by means of a transport ladle.

C'er withdrawal of strands with a cross section of 100 χ 100mm was made in two veins.

Dus modified cast iron in the strands (the samples were taken every half hour during the work process) had the following composition, in wt%: carbon 3.5 to 3.6; Silicon 2.56 to 2.64; Manganese -0.28 to 0.30; Sulfur -0.0 to 0.010; Phosphorus-0.076 to 0.080; Magnesium - 0.040 to 0.044.

Strength properties of the cast iron in the samples:

Breaking strength, σ _Β - 520 to 560MPa;

Hardness, HB-185 to 195;

relative elongation, δ - 4.3 to 4.7%.

Example Ä

A magnosium powder wire is fed to a metal receiving vessel with a cast iron melt of the following composition, based on Ma .-%. Carbon 3.7; silicon 2.1, manganese 0.42, sulfur 0.05; phosphorus 0.06; Iron residue.

Pull-off power, P-0.5 kp / s.

Temperature of molten cast iron, T = 1650K;

Thickness of the powder-wire steel sheath - 0.45 mm;

Magnesium mass per 1 m of sheath 10 g / m (0.01 kg / cm);

Speed of powder wire entry into the cast iron melt

. 0.5 · 1650 V0.05 _ΛΛΛ ,. _,,,,, ...

V = - - = 0.092 m / s (5.55 m / min)

2 · 10 ⁶ · 0.01

Magnesium consumption Q = - ^ - · 100% = ---- ⁱ 100 = 0.184% or 1.84kg / t cast iron.

P 0.5

Simultaneously with the magnesium feed, ferrosilicon was introduced into the cast iron melt in an amount of 0.5% of the cast iron mass.

The starting cast iron was continuously supplied to the metal receiving vessel from a magnetodynamic pump with a flow rate of 0.5kg / s.

Strands with a cross-section of 100 χ 100mm were pulled off in one vein.

The modified cast iron in the strands (the samples were taken every hour during the operation) had the following composition, in% by mass: carbon - 3.45 to 3.5; Silicon - 2.50 to 2.6; Manganese - 0.39 to 0.41; Sulfur 0.007 to 0.01; Phosphorus - 0.54 to 0.058; Magnesium - 0.038 to 0.042.

Strength properties:

Breaking strength, σ _β - 660 to 600MPa;

Hardness, HB-210 to 220;

relative elongation, δ - 5.3 to 5.6%.

Example 3

A magnesium pu. / wire is fed to a metal receptacle with a cast iron melt of the following composition, based on% by weight: carbon-3.8; SIIWum-2,3; Manganese 0.3; Sulfur 0.04; Phosphorus 0.08; Iron residue.

Withdrawal rate -1 kg / s.

Temperature of liquid cast iron In the motal receiving vessel, T - * 1500k;

Thickness of Powder Wire Tile Sleeve -0.04mm;

Magneslumasso per 1 m shell - 0.01 kg / m;

Speed of Pulverdrahtoinführung in the cast iron melt

 , O, 16m / s (9m / mln)

2-10'-0.01 Magnesium consumptionQ - - '- -j- * 100% »0.15% or 1.5kg / t cast iron.

Together with the magnesium, ferrosilicon was added to the molten cast iron in an amount of 0.5% by mass

introduced treated cast iron mass.

The starting cast iron was fed to the metal receiving vessel in a continuous stream at a pouring speed

supplied from 1 kg / s.

Strands with a cross section of 100 x 100 mm were pulled off in two cores. The magnesium-containing cast iron in the strands (the samples were taken every half hour during the work process

taken) had the following composition, in% by mass: carbon - 3.58 to 3.63; Silicon - 2.6 to 2.65; Manganese - 0.28 to 0.3; Sulfur-0.007 to 0.01; Magnesium 0.043 to 0.046; Phosphorus-0.076 to 0.078.

Strength properties of cast iron: Breaking strength, O ₈ - 500 to 540 MPa; Hardness, HB-180 to 190;

relative elongation δ - 4.1 to 4.5%.

Example 4 A magnesium wire is a metal receptacle with a molten cast iron of the following composition, based on Ma .-%, fed: carbon-3.7; Silicon-2,3; Manganese 0.3; Copper-0.5; Sulfur 0.03; Phosphorus 0.06; Iron residue. Withdrawal rate - 1kp / s; Temperature of cast iron in metal receptacle-1650K; Magnesium mass per 1 m shell - 0.01 kg / m: Speed of powder wire introduction into the cast iron melt

V = ₌ o, 142m / s (8,50m / min) 2-10 * · 0,01

Magnesium consumption Q = -100% = 0.142% or 1.42kg / tglass. Magnesium was introduced into the melt together with ferrosilicon in an amount of 0.4 mass% of the cast iron mass. The starting cast iron was fed to the metal receiving vessel in a continuous stream at a rate of 1 kg / s

fed.

Strands with a cross section of 100 x 100 mm were pulled off in two cores. The magnesium-containing cast iron in the strands (the samples were taken every half hour during the work process

taken) had the following composition, in% by mass: carbon 3.57 to 3.63; Silicon - 2.58 to 2.66; Manganese-0.28 to 0.3; Copper - 0.46 to 0.48; Magnesium - 0.038 to 0.042; Sulfur - 0.008 to 0.01; Phosphorus - 0.056 to 0.06.

Strength properties of cast iron: Breaking strength σ _β - 640 to 680 MPa; Hardness, HB-229-240;

relative elongation, δ-7.3 to 7.6%.

Example 5 A magnesium powder wire is placed on a metal receptacle with a cast iron climolzo of the following composition,

based on Ma .-%, fed: carbon-3.9; Silicon 2.15; Manganese 0.5; sulfur 0.01; Phosphorus 0.06; Iron residue.

Withdrawal rate, P-1 kp / s; Temperature of molten cast iron in the metal receptacle, T-1500K; Powder Wire Steel Sheath 0.25mm Thickness; Magnesium mass per 1 m shell-0.01 kg / m; Speed of powder wire entry into the cast iron melt

o, O75m / s (4.5 m / min).

V =

2 · 10 ⁵ · 0.01

Magnesium consumption O «* - ^: --- ^! - · 100% = 0.075% or 0.75kg / t cast iron. The starting cast iron was added to the metal receptacle in a continuous stream with a pouring speed

supplied from 1 kg / s.

In parallel with the continuous supply of magnesium into the cast iron melted forrosilicon in an amount of 0.4% by mass

the cast iron mass continuously introduced.

Ee were stripped strands with elnom cross-section of 100 x 100mm in two veins. The modified cast-oison in strands (samples were taken every half hour during the whole casting process

taken in% by weight: carbon - 3.6 to 3.7, silicon - 2.37 to 2.43, manganese - 0.47 to 0.49, sulfur 0.005 to 0.007, magnesium 0.030 to 0.032; phosphorus-0.056 to 0.058.

Strength properties of cast iron: Fractional strength, σ _Β - 560 to 600MPa; Hardness, HB-215bis225; ,

relative doneness, δ - 5.6 to 6.0%.

Example 6 A magnesium powder wire is a metal receptacle with a molten cast iron of the following composition,

based on Ma .-%, fed: carbon-3.8; Silicon-2,3; Manganese 0.3; Sulfur 0.04; Phosphorus 0.08; Iron residue.

Withdrawal rate, P-I kp / s; Temperature of liquid cast iron in the metal receptacle, T-1600K; Thickness of the Powder Wire Steel Lo-0.45mm; Magnesium mass per 1 m shell-0.01 kg / m; Speed of powder wire entry into the cast iron melt

V. 1-1 «» VEW = 0,16m / s (9,6m / min) 2 · 10 · 0,001

Magnesium consumption Q = ---- = 100% = 0.16% or 1.6kg / t cast iron. The starting cast iron was fed to the metal receiving vessel in a continuous stream at a pouring speed

supplied from 1 kg / s.

Simultaneously with the continuous supply of magnesium, ferrosilicon was added to the cast iron melt in an amount of

0.4Ma .-% of the cast iron mass continuously entered.

Strands with a cross section of 100 x 100 mm were pulled off in two cores. The modified cast rock in the strands (samples were taken every half an hour during the whole casting process

taken) had the following composition, in wt .-%: carbon - 3.5 to 3.6; Silicon - 2.55 to 2.63; Manganese - 0.27 to 0.29; Sulfur - 0.006 to 0.009; Magnesium - 0.040 to 0.044; Phosphorus - 0.074 to 0.078.

Strength properties of cast iron: Breaking strength, σ _Β - 480 to 520 MPa; Hardness, HB-190 to 200;

relative elongation, δ - 5.8 to 6.2%.

Example 7 A magnesium powder wire is a metal receptacle with a molten cast iron of the following composition,

based on Ma .-%, fed: carbon-3.8; Silicon-2,3; Manganese 0.3; Sulfur 0.04; Phosphorus 0.08; Iron residue.

Withdrawal rate, P-1 kp / s; Temperature of liquid cast iron in the metal receptacle, -1650 K; Thickness of the powder-wire steel sheath-0.4 mm; Magnesium mass per 1 m shell - 0.01 kg / m; Speed of powder wire entry into the cast iron melt

  0.165 m / s (9.9 m / min)

V =

2-10 ^s -0.01

Magnesium consumption Q = = 100% = 0.165% or 1.65 kg / t cast iron. The starting cast iron was fed to the metal receiving vessel in a continuous jet at a rate of injection

supplied from 1 kg / s.

Simultaneously with the continuous supply of magnesium ferrosilicon was in an amount of

0.4Ma .-% dtr cast iron mask continuously entered.

Strands with a cross section of 100 × 100 mm were pulled off in two wires. The modified cast iron in the strands' the samples became every half hour during the whole casting process

taken) had the following composition, in% by mass:

Carbon - 3.45 to 3.55; Silicon - 2.62 to 2.58; Manganese - 0.26 to 0.28; Sulfur - 0.007 to 0.01; Magnesium - 0.041 to

0.045; Phosphorus-0.07 to 0.075.

Strength properties of cast iron: Breaking strength, σ _Β - 460 to 490MPa; Hardness, HB-180 to 190;

relative elongation, δ - 5.6 to 6.0%.

Example 8 A mulberry powder wire is a metal receptacle with a cast iron melt of the following composition,

based on Ma .-%, fed: carbon-4.2; Silicon, 2.35; Mungan-0.6; Chromium 0.15; Tin 0.05; Sulfur 0.04;

Phosphorus 0.08; Elsen radical. Withdrawal rate, P-1 kp / s; Temperature of the cast iron in the motive receptacle -1700K; Thickness of Powder Wire Steel Olle - 0.4mm; MagnoslummasBo per 1 m t lüllo - 0,01 kg / m; Speed of powder wire entry into the cast iron molten metal

-10- 275 Magnesium consumption Q = 100% = 0.17% or Vkg / t cast iron.

The starting cast iron was fed to the metal receiving vessel in a continuous stream at a pouring speed

supplied from 1 kg / s.

Simultaneously with the continuous supply of magnesium ferrosilicon was in a cast of

0.4Ma .-% of the cast iron mass continuously entered.

The withdrawal of strands takes place in two veins. The strands had a cross section of 100 x 100mm. The modified cast iron in the strands (the samples were taken every half hour throughout the casting process

taken) had the following composition, in% by mass:

Carbon 3.85 to 3.9; Silicon - 2.55 to 2.6; Manganese - 0.52 to 0.55; Chromium - 0.12 to 0.14; Tin - 0.04 to 0.45; Sulfur -

From 0.007 to 0.01; Magnesium - 0.042 to 0.044; Phosphorus - 0.07 to 0.075.

Strength properties of cast iron: Breaking strength, σ _Β - 620 to 650 MPa; Hardness, HB-230 to /? U8;

relative elongation, δ - 7.5 to 8%.

Example 9 A magnesium powder wire is a metal receptacle with a cast iron melt) of the following composition,

based on Ma .-%, fed: carbon-3.8, silicon-2.2, manganese-0.4, sulfur-0.08, phosphorus-0.077; Iron residue.

Withdrawal rate, P-0.4 kp / s; Temperature of the cast iron in the metal receptacle -1600K; Thickness of the powder-wire steel sheath - 0.4 mm; Magnesium mass per 1 m shell-0.01 kg / m; Speed of powder wire entry into the cast iron melt

,, 0,4 · 1600 · VO, 08 _ «_« _ ·, - ",,,

V = - τ-- - - = 0.0865 m / s (5.2 m / min

2 x 10 ^s x 0.01

Magnesium consumption Q = 1OO% = 0,216% or2,16kg / t cast iron.

0.4

The starting cast iron was placed in the metal receiving vessel in a continuous stream at a pouring speed

supplied from 0.4 kg / s.

Simultaneously with the continuous supply of magnesium, ferrosilicon was added to the cast iron melt in an amount of

0.4 wt .-% of the cast iron mass continuously entered.

Strands were pulled off in a vein. The strands had a cross section of 90 χ 90mm. The modified cast iron in the strands (the samples were taken every half hour throughout the casting process

taken) had the following composition, in% by mass:

Carbon-3.65 to 3.6; Silicon 2.45 to 2.5; Msngan-0.37 to 0.39; Sulfur -0.08 to 0.012; Magnesium 0.034 to 0.048;

Phosphorus-0.072 to 0.076.

Strength properties of cast iron: Breaking strength, O ₈ - 480 to 520MPa; Hardness, HB-190 to 200;

relative elongation, δ-5.8 to 6.2%.

Example 10 A magnesium powder wire is a metal receptacle with a cast iron melt of the following composition,

based on Ma .-%, fed: carbon-3.8; Silicon 2.2; Manganese 0.4; Sulfur 0.04; Phosphorus 0.077; Eison radical.

Casting performance (withdrawal rate) -0.5kp / s; Temperature of the cast iron in the metal receptacle -1600K; Thickness of the powder-wire steel sheath - 0.4 mm; Magneelummasse per 1m shell-0.005kg / m; Speed of the introduction of powder wire into the casting sols melt Magnoslum PreventionQ = - '- --ί, 100% = 0, ie% or 1.6kg / t Castolson.

0.5

The output casting was dom photo-taking vessel in oinom continuous stream with oeing Eingießgoschwindigkeit

supplied by 0.5kg / s.

Simultaneously with the continuous supply of magnesium in ferrous silicon in a quantity of

0.4% by mass of Gussols' / nmasso continuously oingogobon.

Strnngo h elnor Ador were demolished. The Stringo had a cross section of 100 χ 100mm. The modified cast iron in the strands (the samples were taken every half hour throughout the casting process

taken) had the following composition, in% by mass:

Carbon-3.54 to 3.6; Silicon 2.44 to 2.5; fangalan-0.37 to 0.39, Schw8fel-0.08 to 0.012; Magnesium 0.039 to 0.042; Phosphorus - 0.072 to 0.076. Festigkehssigenschaften of cast iron: Breaking strength, o _e - 490-530 M Pa; Hardness, HB-195-205;

residual elongation, δ-5.9 to 6.3%.

Example 11 A magnesium powder wire is a metal receptacle with 1500 kg cast iron melt of the following composition,

based on Ma .-%, fed: carbon-3.8; Silicon-2,3; Manganese 0.4; Sulfur 0.05; Phosphorus 0.05; Iron residue.

Casting performance (peel rate), P-0.5kp / s; Temperature of liquid cast iron in the metal receptacle -1600 K; Powder Wire Steel Sheath 0.4mm Thickness; Magnesium mass per 1 m shell-0.01 kg / m; Speed of powder wire entry into the cast iron melt

0.5 · 1660 · VÖ7Ö5 2 · 10 ⁶ · 0.01

- 0.09m / s (5.4m / min)

Magnesium consumption Q = 100% = 0.18% or1.8kg / t cast iron.

0.5

Together with magnesium, ferrosilicon was added to the cast iron melt in an amount of 0.4% by weight of the one to be treated Cast iron mass entered. The starting cast iron was the metal receptacle in subsets, part mass 300kg, every 10 min with a Transport pan fed. Strands with a cross section of 100 × 100 mm were pulled off in one strand. The modified cast iron in the strands (the samples were placed in the immediately before refilling gray cast iron Metal receptacle and taken after refilling), boiled to the magnesium content, following Composition Yin Ma .-%:

before refilling - 0,04, after refilling - 0,033;

Strength properties of cast iron: Breaking strength, o _B ~ 520MPa (before refilling) O ₉ -450 MPa (just after refilling);

Hardness, HB - 230 (before refilling), HB -180 (after refilling); relative elongation, o-5,2% (before refilling); σ-4.2% (after refilling).

Example 12 A magnesium powder wire is a metal receptacle with 1600 kg cast iron melt of the following composition,

based on Ma .-%, fed: carbon dioxide-3.8; Silicon-2,3; Manganese 0.4; Sulfur 0.05; phosphorus 0.08; Iron residue.

Withdrawal rate, P-1 kp / s; Temperature of liquid cast iron in metal receptacle 1600K; Thickness of the powder-wire steel sheath - 0.4 mm; Magnesium mass per 1 m shell-0.01 kg / m; Speed of powder wire introduction into the molten iron melt

_{= 0 (} o _9m / s (5.4m / min) 2 x 10 ⁶ x 0.01

Magnesium consumption, Q = 100% = 0.18% or1.8kg / t cast iron.

0.5

In addition to the supply of magnesium, the cast iron molten Forrosiiizium in oinor amount of 0.4Ma .-% was added to

treated continuously poured cast iron mass.

The output cast iron was the metal receptacle in subsets with oinor portion mass of 360kg by means of a Transport pan fed every 16 minutes. There were strands with a cross section of 100 χ lOOmrr. withdrawn in a vein. The modified cast iron in the strands (the samples were placed in the immediately before refilling gray cast iron Motellaufnahmegeffiß and after dam refilling gonommon) had a successful composition, based on the Magnesium content, in% by mass:

before refilling - 0,04, after refilling - 0,032.

Fostlgkoitsoigonschafton of Gußoisens: Breaking strength, O ₀ -520 MPa (before refilling); Ob-470 MPa (after refilling);

Hardness HB - 220 (before dom refilling), HB -195 (still dom refill); relative elongation, δ - 6.2% (before dom refilling) 6-4.6% (after refilling).

A magnesium powder wire is fed to a Meiallaufnahmegefäß with 1500kg cast iron melt of the following composition, based on Ma .-%: carbon impact 3.8. Silicon 2.3, manganese 0.4, sulfur 0.08; phosphorus 0.08; Iron residue.

Withdrawal rate P-O.Skp / s;

Tempera'ur of molten cast iron in metal receptacle -1700K;

Thickness of the pu verdiaht steel shell 0.4mm;

Magnesium mass per 1 m hell - 0.01 kg / m;

Speed of powder wire entry into the cast iron melt

.. 0.5 · 1700 · ftOf _ft . ",, _. ...

V = - r- ³ ^ - ² - = 0.12 m / s (7.2 m / min)

Z- 10 * x 0.01

Magnesium consumption Q = 100% = 0,24% or 2,4kg / t cast iron.

0.5

Ferrosilicon in an amount of 0.4% by mass of the cast iron melt to be treated was continuously fed into the molten cast iron together with magnesium.

The starting cast iron was fed to the metal receptacle in partial quantities of 300 kg, with a transport ladle every 10 minutes.

Strands with a cross section of 100 x 100 mm were pulled off in one vein.

The modified cast iron in the strands (the samples were taken immediately before refilling gray cast iron in the metal and after refilling) had, based on the magnesium content, the following composition, in% by mass:

before refilling-0.056;

after refilling - 0.06.

Strength properties of the cast iron produced:

Breaking strength, σ _Β - 580 to 620MPa;

Hardness, HB-230 to 240;

relative elongation, σδ- 3.2 to 4.6%.

Example 14 (as a comparison)

The starting cast iron having the similar composition as in Example 2 is treated according to the method of SU Patent No. 554063. The treatment of molten cast iron with a magnesium hydroxide modifier is carried out in a transfer ladle with a capacity of 600 kg. As the magnesium-containing modifier, an alloy having a composition, in% by mass: magnesium-10; Calcium -1.8; Rare earth metals - 0.8; Silicon - 52; Iron - rust, used. Consumption of the modifier - 3.0Ma .-% of the treated cast iron mass. The cast iron temperature before modification was 1700 K.

The modified cast iron is poured into a metal receptacle. The cast iron mass in the metal receptacle is 1200kg; the interval between refills 30 min. The cast iron mass in the metal receptacle is 600kg at the time of replenishment, the mass of the magnesium-containing cast iron to be replenished 600kg. The magnesium content in the cast iron to be replenished is 0.06% in Mo.%, and the magnesium burn-up when keeping the magnesium-containing cast iron in the metal receiving vessel is 0.045% within 30 minutes.

The magnesium content in the cast iron before refilling is 0.025Ma .-%; Magnesium content in cast iron immediately after refilling in% by weight

0.020 · 600 + 0.06 -600 _nn . = 0.04

1200

The modified cast rock in the strands (the samples were taken before refilling the cast iron and immediately after refilling) had the following strength properties:

- Breaking strength before refilling, σ _Β - 359MPa; Breaking strength after refilling, σ _Β - 560MPa;

- Hardness before rewinding, HB-175; Härto after refilling, HB - 235;

- relativo elongation before refilling, δ - 9,4%; relative elongation still refilling, δ-4.4%.

BeUpIs116

The starting cast iron with the similar evaporation reduction as in Beispiol 4 is bouldolt according to the method according to SU-copyright No. 554 063.

The treatment of liquid Guüeison »with a magnosiumhaltionn modifier is carried out in olnor Transportpfanno with elnom capacity of 1200kg.

Al * magnesian '. Modifier is olno Logiorung with uinor composition, in Ma .-%: Magnesium -10; Calcium -1.8; Soltonordmotello - 0.8; Silicon - 62; Eison - rust, vcrwcndot.

The in-use of the modifier is 3.4% by weight / to bohandolndone gußoison mass; dio Gussolsontomporatur before dom Modifying 1700K.

The modified cast-iron is poured into a metal receptacle. The cast iron mass in the metaii receptacle is 1800kg, the interval between refills is 20min. At the time of refilling, the mass of cast iron in the receiving receptacle is 600 kg, the mass of the magnesium-containing cast iron to be replenished 1200 kg, the magnesium content in the cast iron to be replenished, in% by weight 0.07.

The magnesium burn-up while holding the magnesium cast iron in the Mfitallanfnahmegefäß is within 20min 0.03%, the magnesium content in the cast iron before refilling 0.04Ma .-%, the Magnesiumgehait in cast iron immediately after Nacnfüllen, in Ma .-%:

0.04 × 600 + 0.03 × 2CO 1800

 · = 0.06.

The magnesium content after subsequent holding within 20 minutes is 0.03 mass%;

the magnesium content after the subsequent filling of 1200kg cast iron. with a magnesium content of 0.09%, in

0.03 · 600 + 0.07 1200 1800

0.067.

During the two refills, the strength properties of the cast iron have changed as follows: Breaking strength, o "- 620-560-520MPa hardness, HB-250-240-200,

relative elongation, δ- 2.1-43-5.6.

table

Ser. Designation of: 1 The inventive method 2 3 Examples 4 5 6 7 8th No. Characteristics: Change of tensile strength of high-strength cast iron during strand withdrawal, o _B , MPa 3 4 5 6 7 8th 9 : Change in hardness of high strength cast iron during strand withdrawal, HB 1 66 · - 600 500 540 640 680 560 600 480 520 460 490 620 650 Change in relieving strength of high-strength cast iron during strand withdrawal, 6% 2 210 220 100 190 229 240 215 225 190 200 180 190 230 200 1. Amount of magnesium introduced into the cast melted melt, Ma .-%, Q _M , 520 560 5,3 5,6 4,1 4,5 7.3 7.6 5.6 6.0 5.8 6.2 5.6 6.0 7.5 8.0 Second Change of magnesia ripeness strands during 185 195 0.18. '· 0.15 0,142 0,075 0.16 0,165 0.17 Third Ma ..% 4,3 4,7 0.038 0.042 0.042 0.046 0.042 0.046 0.030 0.032 0.04 0.044 0.041 0.045 0.042 0.044 4th Durchechnivill · 0.168 5th receptiongram'j by casting rocks, a,% 0.04 0.044 42 41 41 41 42 40 39 6th 43

Ser. No.· There are some ways to do this 10 11 Examples 13 The well-known method SU, A, 544 063 15 11 12 12 14 16 9 490-530 450-520 13 f80-620 14 620-560-520 10 195-5 180-220 470-520 230-240 15 250-230-200 1 480-520 59- • 6.3 4,2-5,2 195-220 3.2-. -3.6 400-560 2.1-4.3-5.6 2 -190-200 ύ, 16 0.18 4,6-5,2 0.24 175-235 0.34 3 E, 8-6.2 0.035-0.042 0.033-0.04 0.18 0.056-0.06 2.4-4.4 0.07-0.04-0.067 4 0,216 0.032-0.04 0.30 5 0.03-0.0 0.025-0.046

40

41

30

The 'ethno-economic characteristics of the method according to the invention and of the known method used in the table illustrate the method according to the invention.

For example, in the continuous casting of high-strength magnesium-containing cast iron based on the starting cast iron having a composition, in% by mass: carbon-3.7; Silicon - 2.1; Manganese - 0.42; Sulfur - 0.05; Phosphorus '0,6; Iron radical, according to the inventive method (Example 2) the following advantages compared to the known method (Example 14) obtained:

1. An increase in the degree of uniformity of the tensile strength of the strands during the Gisßvorgangs of 160 MPa to 40MP / J, i. 4 times.

2. An increase in the degree of glittleness c'-ir strand hardness during casting from 50HB to 10HB, i. 6 times.

3. An increase in the uniformity degree of the relative elongation during the casting from 2.0% to 0.3%, d. H. by 6.6 times.

4. An increase in the degree of gauging of the amount of magnesium in the strands from 0.021 Ma ·.% To 0.004 Ma. 5 times.

5. A reduction in the amount of magnesia introduced into the molten cast iron from 0.30M>) .-% to 0.184Ma .-%, i. by 1.63 times.

In addition to the stated advantages, the method according to the invention makes it possible to automatically introduce magnesium into the cast iron melt according to a predetermined program, to considerably improve the operating conditions for the operating personnel, to exclude the comminution and the metering of the feed particles to be introduced. In the continuous casting of high-strength magnesium-containing cast iron based on the starting cast iron with a composition in% by mass: carbon-3.7, silicon-2.3; Manganese -0.3; Copper-C ₁ E; Schwefol-0.03; Phosphorus 0.06; Iron radical, according to the method of preparation according to the invention (Example 4), the following advantages are achieved in comparison to the known method (Example 15):

1. An increase in the Glelchmäßigkeitsgradei <, at tensile strength of the strands during the entire casting process from 100 MPa to 40 MPa, ie 2.5 times.

2. An increase in the degree of uniformity. strand hardness during casting from 50HB to 10HB, i. around that

3. An increase in the degree of uniformity of rclntivan elongation during the casting process from 3.5% to 0.3%, i. 11 times.

4. An increase in the degree of uniformity of the amount of magnosium in the strands from 0.013 Ma.% To 0.004 Ma.%, D. H. by 3.25 times.

5. A reduction of the amount of magnesium to be introduced into the cast iron ore melt from 0.34 mass% to 0.142 mass%, d. H. about 2.4 times.

In addition to the above advantage, the method according to the invention allows:

To automatically introduce magnesium into the pouring-side melt according to a predetermined program;

- to exclude the comminution and dosing of magnesium-based alloys;

- to prevent olne de-modification;

- Don Magnosiumgohalt in don strands on oinom prejobonen Nivoau aufrocht juorhalten;

- wosontlich improve the working conditions for the operator;

- don't increase the magnosium intake by the cast iron.

The present invention is known in the Gloßereiwöson in the mass production of cast strands of hochiostom cast iron on Gußelsenstranggußanlagon 'iingesotzt wordon, the wordon as Rohlingo for Hydraulik · and Pneumatikgerätteile with increased demands on dio Fostigkolts- and plasticity.

Dai arrindung & gemlße process for the continuous casting of high-strength magnesium-containing cast iron allows dif. Tensile strength of the strands "as well as the tendency of the strand hardness and the elongation to increase many times. In addition, the invention makes it possible to increase the degree of iron oxide in the strands by a multiple and to reduce the magnesium mongo to be introduced into the castoison oil.

Claims (2)

A process for the continuous casting of high-strength magnesium-containing cast iron, comprising the introduction of a cast iron melt into a Meialiaufnahmgefäß, the magnesium addition to the cast iron melt, the forming of a strand in a mold and the strand withdrawal from the mold, characterized in that magnesium in a steel shell with a Continuously fed rate, which ensures a magnesiurr.gehalt of about 0.03 to about 0.06 wt .-% in the material of the formed severity. 2. The method according to claim 1, characterized in that the speed of Magnesiupvuf (- '!, r after the dependency