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?
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?
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.
OeldeWolf
who may yet be kicked out of the Republik of Kalifornia for owning too many firearms.
I didn't claw my way to the top of the food chain, to eat only vegetables!
It specifically says Brinnell. Wikipedia also lists the hardness of lead at this same value. I don't have a clue.
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). 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”?
1(MPa) = 0.18BHN
38.3 x 0.18= 6.894Bhn
Regards
John
John Boy
Nice reply, Do you have a reference to where you found that? Just for the curious you know.
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |