Simple solution to problem just ask the yardman to see an inventory of their black cast then ask for or purchase a small sample to perform some acid testing on.
Nitric acid is commonly used to identify metals, a small drop onto a filed clean surface free of oil will produce colors specific of those used in the alloyed metal. Adding a bit of heat will definitely speed up the chemical reaction.
If your paranoid of using acids use a grinder for spark testing.
Identifying metals for welders, good information for the scrapper.
Lots of charts. Metal Composition: Analysis , Tests and Charts
Metal Tests : How To Identify Metals For Welding : Maine Welding Company
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