View Full Version : Confusion about Brinnell scale
I just came from the periodic charts. As per this source, lead has a Brinnell hardness of 38.3. Seems like I heard that lead has a BHN of 5 or some such.
Can somebody straighten me out on this?
OeldeWolf
09-09-2007, 04:08 PM
There are several different hardness scales. The Brinnel hardness scale puts pure lead at 5, you are correct. Check the chart, perhaps they are using the rockwell scale.
It specifically says Brinnell. Wikipedia also lists the hardness of lead at this same value. I don't have a clue.
Whitespider
09-09-2007, 05:48 PM
Jim,
Wikipedia lists lead as Brinell Hardness = 38.3 MPa.
(MPa) means a “Pascal Unit” not the Brinell Hardness Number (BHN).
I’m not sure how a (BHN) is converted to (MPa). I do know that (MPa) is a (SI) value use in the “International System of Units” (Système International d'unités) or (SI). :veryconfu In other words, the (MPa/SI) value is used universally throughout world and (BHN) isn’t. I suspect that the publications you’re looking at are also expressed in the (SI) value rather than the (BHN).
Remember when we were supposed to convert to the “Metric System”? :roll:
John Boy
09-09-2007, 07:59 PM
1(MPa) = 0.18BHN
38.3 x 0.18= 6.894Bhn
scrapcan
09-09-2007, 08:41 PM
John Boy
Nice reply, Do you have a reference to where you found that? Just for the curious you know.
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