Ladle stirring corrects steel casting misrun defect at NACO.

Since adopting argon ladle stirring, the foundry has eliminated a defect, improved melt quality and saved $6.50/ton of steel poured.

Last year, the Cicero, Illinois foundry of National Castings, Inc. (NACO) was having a problem. The 500-employee steel foundry was experiencing 1524 incidents per month of misrun defects on cast-in numbering and lettering on a 1300 lb railroad car bolster casting.

The defect would show up as missing or very faintly legible characters. In many cases, with one or two figures missing, they could be weld...

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