DE2012069A1 - - Google Patents

Description

Dr. 0. Dittmann K. L. Schiff Dr. A. ν. Füner Dipl. Ing. P ,. Strehl DA-6210

Patent Attorneys -

8 Munich 90, Mariahilfplatz 2 & 3, phone 45 4040

description

to the

Patent application of the

Z Έ HTM AS CH, Chaussee sa Gara Iskar, Sofia / Bulgaria

concerning

Complex modifier for the production of high quality Qieaslings , s? Ts Ctosseison wm * Verf # hfjft * u its production. .

The invention relates to the customization and a process for the production of a complex modifying agent with a strengthening effect, "oak" for the production of high-quality castings from modified 0u * "egg" which is determined by types of bit with the following strengths (tensile strength, flexural strength, 4a sv / ms ² )! 24 · ** »£ 8 - 4Θ uttt 92« 92.

The codifying agents most frequently used in the production of "ex & if iselerte" Qusseisen are rwrosilisiu "tad FerrokalÄiis *" doen their Ye "" Ä & mg is connected to the following parts of the Kaoh-parts a seSiwasfe · «ad unstable ModJUfleierungsffekt, a great Modifixisnaags-

(0.6 Ub 0.9 * 5, a significant Ö

009839/1556

of the metal, the formation of a difficult to remove viscous slag and other * As a result, the modifiers mentioned the ever-growing demands In terms apply to the Giesserelfertigung not meet "Recently, in the Veit practice so-called" complex modifier ¹¹ an ever wider application. The are complex multi-component ligatures consisting of several chemical elements, each of which has a specific effect (modification, desulphurisation, degassing, etc.) The modifying effect of complex modifiers is considerably better and depends directly on the rational choice of the components of their composition.

The modifying agent according to the invention is very effective and enables the production of high-quality Uiesslingen from gray cast iron. It has the following chemical composition

Si m 64 Ii, C «20 JS, Cu · 8.5 # _t C · - 3.6 # and Al m 1-, 5 Dm Kodiflslerungsmittel is a mechanical mixture of * 20 Oew. % Orphite sit with a corrugation of 0.5 Ms 2 am, where the starting material is graphite electrode with a high carbon content (over 98 Jf) and 80 Oev. % of a ligature of the following chemical accessories uses weaving Cu · 10 #, Al - 1.4 to 1.7 %, Ct · 4 to 5 %, Si - der ItMt Mf 100 It. 01 · Uf »tMr« Ar «Ir « Im · Tiefelofea from the following Aum & ngmnm hsTf ^ represents Kristellin ·· Silitiu «, Klektrolytkupftr, Silleoktlsioi and A

the old nut trade is from Iryoaith. The ligature is comminuted according to du 01 ···· «in the small HSokti la grains from the 1 to 5 am.

Dm «odifizierunemlttel 1st for dl · Heretellunt of modified cast irons of types old following fixings fMlgattt

009,839 / 1556

BATH

(Tensile strength - flexural strength, in kp / mm): 24 - 44, 28 - 48 and 32 - 52.

The modification temperature (in the cupola tapping channel) is 1400 to 1440 ° C.

The proposed modifier has the following basic properties: an excellent anti-whitening effect; the production of high-quality castings without white radiation with a wall thickness of over 6 mm is guaranteed; a refinement and equalization of the structure of castings with a variable cross-section is achieved; the production of a 95 to 100 # -ig @ n pearl structure is guaranteed with fine, dispersed and evenly distributed graphite of type A; the mechanical ^ strength properties of cast iron are increased by 25 to 30 % ; a uniform hardness in the castings (in the order of 180 to 220 kp / mm) is guaranteed depending on the type of cast iron; the wear resistance is increased; the .mechanical workability of the castings is improved and their service life is extended; the liquid cast iron is refined (degassed and desulphurised); the modifying agent is well absorbed by the liquid cast iron without the formation of additional slag amounts being observed.

The high effectiveness of the proposed modifier is due to the following peculiarities, which distinguish it from the known complex modifiers:. .

(a) appropriately chosen chemical composition;

(b) Presence of high carbon graphite in the modifier (over 98 %).

009839/1556

Some of the well-known complex modifiers also contain graphite, but they use common foundry grit, which contains large amounts of impurities and is fairly low in carbon (around 75 to 80 %). The investigations of the inventors, as well as the latest reports in the technical literature have shown that the effectiveness of graphite in the modifier increases sharply with the increase in its carbon content;

(c) Use of technically pure crystalline, none silicon containing unnecessary admixtures in the composition of the modifier.

' Silicon is a basic component in almost all known modifiers, but it is introduced into their composition in the form of ferro-alloys (ferrous sulphate and calcium calcium). In this way, the amount of unnecessary admixtures (Elsen, calcium, etc. above the necessary amount) is increased whereby the effectiveness of the codification is reduced by means of *

The modifying agent according to the present In comparison with the known modifying agents, the invention has the advantage that when it is used whitening of the casting length does not occur while t whose tensile strength is increased by 8 to 12 kp / mra.

Claims

009839/1556

Claims (2)

-3- Patent anacrUche 1. Graphitizing modifier, characterized in that it is used to achieve a high Effectiveness in the production of high-quality castings from Gusselsen has the following chemical composition: Sl β 64 %, C m 20 % _t Cu »8.31 %, Ca« 3.6 # and Al »1.5 96. 2. A method for the production of a graphite hodification agent according to claim 1, characterized in that the carbon in the starting material for producing the modifying agent is introduced in the form of granular graphite, which is obtained from graphite electrodes with a high carbon content (over 98 %} . 3. Process for the production of a graphitizing modifying agent according to claims 1 and 2, characterized in that crystalline (pure) silicon, in which no superfluous additives (such as eg Else ») Available lind * 009S39 / 15B6