Patent ID: 8056604

Claim:
A one-pour process for preparing a metal test casting having two or more solid cylinders of different diameters useful for predicting the severity of skin that will form on a casting made of compacted graphite iron or ductile iron comprising: (a) preparing a refractory mold assembly configured such that a mold thereof comprises (i) a gating system comprising a downsprue, runner system, and at least two ingates, and (iii) two or more hollow and substantially cylindrical shapes having substantially the same height and different diameters, such that there is an ingate to each of the hollow cylindrical shapes of the mold, (b) pouring molten compacted graphite iron or ductile iron into the mold assembly through the downsprue, (c) allowing the molten compacted graphite iron or ductile iron to pass through the gating system to fill the hollow cylindrical shapes of the mold, (d) allowing the molten compacted graphite iron or ductile iron to cool to solidify into a metal test casting having two or more solid cylinders, (e) removing the test casting from the mold assembly, and (f) measuring the skin formed on the solid metal cylinders of the metal test casting.