DE1508174B1 - Additive for the inoculation treatment of cast iron - Google Patents

Description

It has proven to be desirable, if not 50 2. Additive according to claim 1, thereby geals emphasized absolutely necessary, the addition indicates that as a substance with the physikamittel to add a substance that has stearic acid under the heat lischen properties of a wax the molten cast iron is converted into a gas and ferrosilicon is used as a dispersed vaccine, since this measure will turn the dissolution of the additional.

by means of supported and is particularly advantageous if 55 3. Additive according to claim 1 or 2, there-

the agent is used in tablet form. A denotes that there is a further sub-

A particularly useful additive for this purpose is punch that contains under the heat of the liquid

Hexachloroethane, since it is converted into a gas without a solid residue of iron,

decomposed. A proportion of 2 to 10 percent by weight of the 4th additives according to claim 3, characterized in that

Gas-releasing substance, especially the hexa- 60 indicates that the other substance hexa-

chloroethane is particularly suitable. is chloroethane.

. 5. Additive according to one of claims 1 to 4, characterized in that the proportion of the There were three comparison cast plates of the wax or the substance with the physical type described in the following inoculation methods - 65 properties of a wax cast 20 to 35 weight: percent of the additive.

Claims (1)

ι 2 The invention relates to an additive to 1. without vaccine, Inoculation treatment of cast iron in the mold _{2 with about? Ferro silicon powder 5} It is known that in order to achieve the gray ^{b r} solidification of cast iron in place of a Weißerstar- 3 with about 7 g of a composition (in Tabletrung necessary, the number of crystallization tenform 5) germinate ferrosilicon of 1.676 for to enlarge the graphite and to do so 0.353 mm can be achieved by giving the iron, mesh size percent by weight usually in the pan, a so-called »vaccination. ". fabric «adds. The most commonly used vaccination / 5 to SU / o Si öS The material is ferrosilicon. However, there are also other stearic acid 30 Vaccines known to be used successfully with hexachloroethane 5 reach. It is the purpose of the present invention to provide an iron cast into plates containing 2.80% Additive for inoculating cast iron to total carbon, 1.66% silicon and 0.05% develop the tendency to solidify white of the 15 phosphorus. Reduce cast iron. In comparison with the non-inoculated casting according to the invention, the additive consists, with (1), which was assumed to be zero, the softening before the casting of the cast iron, the inoculation reduction of the quenching effect, was 47% of the cast material introduced into the casting mold becomes, from a piece (2) and 75% in the casting (3). For the thermally residue-free decomposing wax or for averaging the quenching effect, plates of a thermally residue-free decomposing sub-150X150 mm size and 12.5 mm thickness with constant with the physical properties of a niche projections B, C and D on three sides of wax and the were used in this wax or this sub- about 9.5, 8, 6.3 mm thick, 50 mm wide and a punch dispersed vaccine. Length of the outer edge of 125 mm. After the appropriate waxes have been used, the known natural castings were waxed off the extensions from the plate, such as beeswax, carnauba wax, mon-cuts, broken in the middle and checked visually, tan wax or paraffin wax. Suitable substances White exposure from the edges was defined as the quenching height with the physical properties of a wax. If, in the case of an untreated, substances such as fatty acids, fatty alcohol or fatty acid samples (comparison sample) this value is H ₁ and ester, ζ. B. stearic acid or alkyl stearate. 30 in a vaccinated sample is H ₂ , the Ab- The vaccine is preferably ferrosilicon. The shock reduction H ₁ - H., as a percentage value of the additive, can expediently be determined from 30 to 80 weight percentages. percent ferrosilicon. The method according to the invention should therefore preferably be carried out however, the proportion of wax or the corresponding to a substantial reduction in the deterrent Substance not exceed 35% of the mixture, 35 effect compared to normal use since higher proportions do not lead to a further improvement of the vaccine, tion of the results seem to lead. The additive is preferably in the form of tablets with claims: a standard weight used so that a suitable number of tablets in the casting mold iron can be introduced. In general, a vaccine should be placed in the mold, Quantity about 0.7 to 1.4kg ferrosilicon per ton of the characterized in that it is a molten iron to be treated, wax that decomposes thermally without leaving any residue if there is no pre-inoculation of the iron in the pan 45 or a thermal residue-free decomposition has been. However, it can be less offensive with the physical substance when the vaccine is in contact with a wax and the wax in that wax with a pre-vaccination, d. H. a normal vaccination or vaccine dispersed in this substance the pan. holds.