Patent ID: 6571856
Filing Date: 2003-06-03
Classification: G01N

Abstract:
A process for producing a CGI casting or optionally a SGI casting, requiring a sampling device, at least two means for recording cooling curves, and a means for administering structure-modifying agent(s) to a molten cast iron from which said casting is to be produced, said method comprising:a) providing a sample of the molten cast iron from which said casting is to be produced, and adding said sample to a sample vessel; b) simultaneously recording at least two cooling curves, at distances r1 and r2, etc., from the centre of the sample vessel; c) determining at least two heat generation curves by using the information obtained in b), wherein each one of the at least two heat generation curres depends upon the at least two cooling curves; d) comparing the heat generation curves obtained in c) with previously determined heat generation curves representing known concentrations of structure-modifying agents which previously determined heat generation curves have been obtained under same conditions as in step a), b) and c); e) determining the amount of structure-modifying agent to be added to the melt based upon the comparison in step d); f) causing said means for administrating structure-modifying agent to administrate a correct amount to the melt; and g) carrying out the casting operation.