DE557798C - Process for the production of a melt for silicon-iron casting - Google Patents

Description

Method for producing a melt for silicon-iron casting In Silicon-thermal energy and its practical application have already been used in silicon-iron casting manufactured in such a way that one has high-percentage ferrosilicon with iron as an addition has fused, with strong exathermic reactions causing extraordinary temperature increases cause. Iron-silicon alloys have also been found by introducing solid, but preheated ferrosilicon is made in molten steel baths. There were the ferrosilicon additives are added in separate amounts without any interference the thermal profile should be achieved in this way, albeit as with the object of the present invention, the purpose of the method is to generate an anti-acid resistant silicone alloy. Finally one has also suggested this silicon-rich iron alloys at the lowest possible temperature, close to the melting point, to shed.

The invention now relates to a method for producing the silicon-iron alloys, in the known way, initially high-percentage ferrosilicon with silicon-free or poor iron is melted down.

While so far with these alloys, especially with deoxidation of iron, comparatively high, d. H. substantially above the melting point Temperatures were deemed necessary, it has surprisingly been found that in the production of silicon-iron castings the other way around = to achieve a good one Gusses compliance with the lowest possible melting temperatures during the formation of the Alloy is of crucial importance, since only if any overheating is avoided the melt will certainly produce a usable, dense, bubble-free cast.

It has now been found that by adding cold, low-silicon Iron, i.e. solid pig iron, is the temperature of a silicon-rich melt the same remains just above the point of solidification, so that one, complete The temperature profile is different than before, especially since the further heating in the oven is set in the process. There are thus no undesirable effects during the formation of the melt thermal effects.

It has also been found that you can in the manner described below the overheating that takes place during the fusing, the development of which is known cannot prevent, if not completely, at least greatly reduce it and hereby can improve the quality of the silicon-iron casting quite considerably.

According to the new melting process, a silicon-rich melt than is required for the castings, high-percentage Ferrosilicon with the addition of part of the necessary low-silicon or. -free Melted iron and then stopped any further heating. That still-missing low-silicon iron is then in solid form without preheating in the liquid melt, the temperature of which is then kept just a little above your solidification point is entered. This eliminates any increase in the temperature of the melt exothermic reactions are balanced out, so that one in the vicinity of the melting point is permanent temperature is maintained.

Claims (1)

PATENT CLAIM: Process for the production of a melt for silicon-iron cast from high-percentage ferrosilicon and silicon-free or low-silicon iron or iron alloys, the temperature of which is close to the melting point, characterized in that initially all of the high-percentage ferrosilicon with only part of the low-silicon iron required as an addition is fused, whereupon the still missing part of the low-silicon iron in solid form and not preheated is gradually introduced into this melt, the silicon content of which is higher than that required for casting, in such a way that a temperature close to the melting point is constantly maintained .