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Abstract

A melt sample is taken in a sampling vessel which is in thermic equilibrium with the sample quantity prior to solidification commencing, the sampling vessel having been provided with at least one thermoelement and containing a determined and calibrated quantity of inoculating agent based on FeSi and sufficient to produce a maximum inoculating effect. The sample melt is allowed to solidify while temperature changes per unit of time are recorded. The difference between the minimum temperature in the undercooling phase, the maximum temperature in the eutectic reaction phase, and the eutectic equilibrium temperature T.sub.e, are determined. To the base melt are added thermodynamically stable particles of the type spinels, oxides or oxysulphides of elements such as magnesium, aluminium, potassium, zirconium, strontium, titanium and rare earth metals when the difference between eutectic equilibrium temperature T.sub.e and the minimum temperature in the undercooling phase exceeds 10.degree. K. and when the difference between T.sub.e and the maximum temperature in the eutectic reaction phase exceeds 5.degree. K. If found suitable, these method steps are repeated until those differences fall beneath 10.degree. K. and 5.degree. K., respectively.

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