Not ignoring you...just haven't had a chance to get pics posted...should get some this weekend!
As for the info part, I think you're looking for a lower Rockwell, around 48-49? My spikes, which I'll post later, are basically just untreated barstock or nails. They may take a curve, but I've never broken one. The spikes, themselves, have never even taken more than a slight curve (maybe 5 degrees over the total length).
Finish is rough, since they're meant to be used. The more "knife-like" throwers I have probably have a higher HT on them, but remember, you don't really have to keep an edge--if you're throwing handle-first, this is a distinct liability, in fact!
Well, that's my two coppers, I'll post some pics for you later, Robert. Just didn't want you to think we's bein' un-neighbourly!!!
