TheDawn
Welcome to the Swamp Rat Forum, I'm glad that you stopped by.
I can't tell you much about the Rat7 in D2 as I've never owned one, I can however tell you a lot about SR101, D2 and the knives we have made in this size range.
Swamp Rat has used SR101 since we began offering knives in 2002. SR101 is a modified 52100 tool steel, with our propreitary heat treat. It offers durability, edge retention, and lateral strength to name a few of it's attributes. D2 has also been used by Swamp Rat, we chose not to use D2 in anything over 4.5" in blade length because D2 does not offer the lateral strength we expect in a knife that size. We feel D2 is a great steel for a small knife because of it's great edge holding abilities.
If I'm correct the RAT7 is a knife with a blade length of 6.5". We currently offer the M6 that has a 6" blade length and in the past have offered the Ratweiler and Camp Tramp that have had 7.5" blade lengths. These knives are made of SR101 with a differential temper. Some pics of some of our tests are shown below. I would suggest checking out the RAT7 in D2 to see if it will offer comparable performance.
Concrete Block Chop
Here are some pictures of the Concrete Block Chop we performed live at Blade Show. The first one is of the Battle Rat slicing paper before the Block Chop. This is to prove this is a sharp knife, we wanted to cut the block not smash it. A hammer can destroy a concrete block but not cut into, we cut into and through it.
This next pic is an impact shot. Check out the concrete shooting off the block. These were high impact chops, not (as Jerry said) "little, protective girly chops" To note, when chopping through the block the energy was all focused on one section of the blade. It was NOT spread over the entire blade.
Here is an action photo. See if you can find another manufacturer who trusts their blades enough to do this at a show.
And here is the Edge after the chopping was done, no damage, no chips, no cracks only dull.
Just to let you all know, I brought this blade home and sharpened it up, no problems(more on this later). So if you ever decide to cut through a concrete wall you can use the Battle Rat and resharpen it yourself.
While this knife was dull I've actually used knives that were duller. I wouldn't expect it to be sharp, it just chopped through a concrete block. However, one thing to note is that John Novak(Nimrod) actually was able to slice cardboard after this test was performed. Other manufacturers knives would have crumbled with this test.
I was able to resharpen the edge with a loaded strop and my Sharpmaker, I spent approx 20 minutes resharpening it. Any good quality sharpener would have done the trick. I wanted to prove that I was able to resharpen the edge without having to send it in, or go out and buy an expensive sharpener.
This test really proves several things.
1) Incidental contacts with stone, concrete, rock while using a Rat isn't going to cause any problems and you will be able to resharpen the blade yourself.
2) The Rat won't chip out when using it on bone or other hard material, even with hard impacts.
3) If you lose your jackhammer and you want to do some remodeling....
Seriously, this was the most incredible thing I've ever seen a knife do. The impacts were full impacts, I'm glad I had safety glasses on because concrete was flying everywhere.
Another point to make about this is that not only weren't there any rolls on the edge there weren't any chips taken out. This is significant, because a chipped blade affects more than just the chip. Other sections around the chip can be affected by microfractures.
Also, if you do have contacts with stone, concrete, etc while chopping you don't need to send it back to have the damage ground out. You can do it yourself.