B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
B22D 27/20 (2006.01) C21C 1/10 (2006.01)
Patent
CA 2076850
2076850 9113176 PCTABS00007 The invention relates to a method of regulating the solidification process in iron casting operations. This is effected by determining the intrinsic crystallisation ability of a base melt and modifying the same. A sample is taken from the base melt in a sample vessel which is in thermal equilibrium with the sample melt before solidification commences. The sample vessel is provided with at least one thermoelement and contains a given and calibrated quantity of inoculant on FeSi-base, this quantity being sufficient to provide a maximum inoculating effect. The sample melt is allowed to solidify and the difference between the lowest temperature in the undercooling phase prior to the eutectic reaction and the maximum temperature in the eutectic reaction phase and the eutectic equilibrium temperature is determined. When this difference exceeds 10 K and 5 K respectively, thermodynamically stable particles of the type spinels or oxysulphides of elements such as magnesium, calcium, zirconium, strontium, titanium and rare earth metals, are added to the melt. These procedural steps may be repeated until the temperature differences fall below the aforesaid limits.
Fetherstonhaugh & Co.
Sintercast Ab
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