Current state of casting yield: Results of 1997 SFSA survey

R A Hardin; C Beckermann

The results ofa casting yield survey of steel foundries, taken by the Steel Founders' Society of America (SFSA) in the first quarter of 1997, are presented. Data collected in the survey includes the average, best case and worst case castings yields for steel castings, and statistical data on the factors that influence casting yield. The average casting yield was Sound to be 53.3%, and the average best and worst case casting yields were found to be 72.7% and 33.2%, respectively, based oil a per response average. The response rate for this survey was 40% of the North American steel foundries contacted. Production, end-use, steel type, geometry and risering methodology factors were identified and ranked in importance affecting casting yield. The following were statistically identified as important positive factors on casting yield where yield increases with their increase: tons produced pet pattern, amount of railroad and wear resistant end-use production, average section thickness and use of risering rules developed in-house. A negative impact on yield was found to be, elated to pump and valve end-use production, and corrosion-resistant steel production. The quantitative contributions of these factors on casting yield are presented. Unconventional yield improvements were rated very low, relative to methods currently in use. Induction heating, compressed air cooling and stacking of castings were indicated as unconventional methods that had been attempted in foundries.

Current state of casting yield: Results of 1997 SFSA survey

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