I batoned with a piece of granite bolder on my hook, I was to lazy to look for a proper baton
you should never baton with a hammer though, unless your noss <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />
btw are scrapyards variably tempered, because my hook took some pretty rough dents on the spine
I am very confident that SR-77 is "through hardened" same hardness all the way through.
I just stated (prior to seeing your post), but I will state again: Granite is "usually" harder than steel. Granite is more brittle, so it can break (fractures) easier than steel, but since it is harder, it can and often will do some damage to softer steel.
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See my link above to:
Dogfather Ding See my post about 9 post down (maybe others if you are bored...)
From that link and post:
"In reference to knife steel vs. Rock, some understanding of Mohs Hardness scale might be helpful!!!
Hardness Mineral Absolute Hardness
1 - Talc - 1
2 - Gypsum - 2
3 - Calcite - 9
4 - Fluorite - 21
5 - Apatite - 48
6 - Orthoclase Feldspar - 72
7 - Quartz - 100
8 - Topaz - 200
9 - Corundum - 400 (Rubies and shaphire)
10 - Diamond - 1500
* Orthoclase Feldspar is a common mineral mixed with Quartz (and other elements) to create granite.
So, granite being one of the most common types of igneous rock, falls in around 6-8 on the Mohs' hardness scale depending on many factors.
** Quatz can actually reach 9 on the Mohs' scale.
But, granite, being one of the more common types of rocks is "harder" than most knife steels. Some rocks are harder. Some rocks are softer.
On the Mohs' Hardness scale:
pencil lead has a hardness of 1;
fingernail has hardness 2.5;
Gold, Silver & aluminum range from 2.5 to 3.0;
a copper penny is about 3.5;
a knife blade, 5.5 (depending on type of steel);
window glass, 5.5 to 6;
steel file, 6.5
Tungsten Carbide, between 8-9 (about 88 - 90 Rockwell Hardness!)"
