Sorry for the topic drift, but this thread revealed something very interesting to me about this forum. The last post of any kind was back on April, and yet within 48 hours of this question being asked multiple answers were quickly posted. I was surprised at the size of a thread that had just started. This tells me that this forum is not dead like some get, but rather there are many people visiting and just waiting to answer questions, as soon as somebody has one. That is a good thing for visitors to know.
As to the initial question, as has been said, these are one of the major pitfalls of using mystery steel, and even those most knowledgeable in heat treating can't fill in the blanks if they don't know what it is.
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