It has been shown that the notch sensitivity of unalloyed titanium as determined in the notch tension test differs from that measured in the Charpy V-notch impact test. The ductile-brittle transition in the notch tension test occurs at a much lower testing temperature than does that for the impact test.

At a testing temperature of −100 F (−73 C) neither 0.26 per cent carbon nor 0.23 per cent nitrogen leads to embrittlement in unalloyed titanium as determined in the notch tension test.