http://www.allexperts.com/previousqv.asp?QuestionID=1021526
Question Please list these metals in order from
softest to hardest.Thanks
brass,bronze,aluminum,T6 aluminum,titainium, stainless steel and mild steel.
And on what type of scale are metals rated?
Answer Hello Mike!
Boy, this smells like a homework question! I hope I can get the answer to you in time!
In General- and I have to qualify that by saying I'm considering the metals to be in the annealed condition, the aluminum is 1100 alloy, the T6 (not annealed, but age hardened) aluminum is a 2000 or 7000 series alloy, and the titanium is 6Al-4V alloy rather than the commercially pure stuff (6-4 is a lot more common than CP)- the order would be
aluminum, brass, bronze, T6 aluminum, mild steel, stainless steel, and titanium. If the metals are in their hardest conditions, from heat treating or cold work, the order would be aluminum, brass, T6 aluminum, bronze, titanium, mild steel, and stainless steel (cutlery grades).
I assume your second question relates to hardness scales that would cover all of these materials. The Rockwell hardness scales are the most commonly used in the States, and I believe Vickers hardness is most commonly used in Europe. The trick part to this question is that the Rockwell C scale (150 Kg load, diamond Brale indentor) is used for the harder materials, the titanium, stainless steel, and the mild steel. The Rockwell B scale (100 Kg load, 1/16" ball indentor) would be used for the softer aluminum, brass, and bronze. The Rockwell A scale, 60Kg load and Diamond Brale indentor, could be used for all of the metals listed.
If you have any more questions, please write back!
Lee Gearhart