Calculation metals tensile & hardness test uncertainty

Time to plunge into this (again)

If it was easy you would see it done more often.
Hardness has issues beyond dealing with the test results, the test itself has huge variability issues due to various microstructures.
And have you ever tried to check alignment on a tensile machine?

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P.E. Metallurgy, consulting work welcomed

You beat me to it kingnero.

I could hold forth for several hours on the pitfalls of hardness testing (and don't even start on portable).

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."