File talk:Hardness comparisons (Brinell hardness).png

Says "created myself" - Is that from numbers in some of the Hardness comparison sources ? and does it relate to all materials or just steels ? - Rod57 (talk) 01:40, 9 December 2015 (UTC)

Y-axis is unclear --Rlion7 (talk) 17:29, 1 June 2020 (UTC)