Method for the production of ductile cast iron

Details Method for the production of ductile cast iron Method for the production of ductile cast iron

C - Chemistry, Metallurgy

21

C

C21C 1/10 (2006.01) B22D 2/00 (2006.01) B22D 46/00 (2006.01) G01N 33/20 (2006.01)

Patent

CA 2093419

2093419 9206810 PCTABS00011 A method in the production of ductile cast iron comprising controlling and correcting the composition of the cast iron melt. The method further comprises extracting a sample from the melt, the mother melt, and adding an amount of an oxide, a sulphide or an oxy-sulphide with the ability to oxidize an amount of the modifying agent present in the sample and corresponding to the fading rate occurent during the casting process as a whole. The sample is permitted to solidify in a sample vessel equipped with two thermocouples, one in the centre of the sample vessel and the other in the vicinity of the sample vessel wall. The temperature and time are recorded during the process of solidification in a manner known per se and nodularity is calculated. If the amount of modifying agent is too low to secure a fully nodular graphite throughout the whole casting period, an appropriate amount of modifying agent is added.

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