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Ok. I worked it out.
I called my buddy Steve Culver ABS-MS, and we talked about it. I sent him some pics and it was decided that it could not be cast iron, as cast iron cannot ne forged--it would just crumble. Furthermore, it wouldn't make a good wrench. However, it does have a random grain structure without the linear properties of rolled foundery steel.
Since it heat-treated the same as most other simple carbon steels I've used, we concluded (he concluded--I agreed) that it is cast steel.
I may even get a bit of a dendritic edge when I sharpen it--just guessing on that one.
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