Chainsaw Repair

I've seen plenty of folks who can get get pretty close guessing the carbon content of the steel (I used to be half decent at that myself, but far from an expert, and I've been away from it for long enough that I wouldn't even hazard a guess now). I've seen a few who can make a decent stab at some of the other alloying elements. 

I've never met anyone who could get the actual grade of steel with any real reliability (i.e. that's a 1050 grade, or that's 4140 grade, 9254 etc.)  If you've got access to folks who can do that you're lucky.  It seems to be a vanishing art.  With all the liability concerns around these days, we always have to do an analysis if there is any doubt, or if a customer comes in with a question or claim.