No not really... <img src="/ubbthreads/images/graemlins/loopy.gif" alt="" />

But all recent reading of what INFI is based has got me thinking. Is SR77's chemical make-up different to S7 or just it's molecular structure different from SYK's proprietary heat treat?
In other words, is SR77 just S7 with SYK's special heat treat protocol and a different name for marketing/whatever purposes? <img src="/ubbthreads/images/graemlins/confused.gif" alt="" />

If I'm not mistaken, somewhere on the main website states as much.

Ya, d00d! It's purposeful marketing. SR-77 is heat-treated to behave like a magnified version of S7 (before Dan and Patti got to it, only AngelSword was doing such things with S7), so the different name lets you know it's not just heated/quenched/tempered. That said, 'plain old S7' is simply amazing and making it even better is, well, even better!

Rumor time. I think I remember reading early on that SR77 (like INFI and SR101) has added Nitrogen and Cobalt to improve sharpening/edge properties. Maybe someone who knows more than me can comment.
Ron Athay

That's a cool sounding rumor! I had only heard that the a rigorous heat-treatment protocol was given to S7 to make it 'SR-77.'

I don't know how Dan makes SR77, but I am glad he does. Up until recently, my favorite steel for big knives has been 1095. Sometimes it breaks, but it is easy to sharpen and holds a good edge. Today I saw a dead old hardened oak limb had blown down. It has been dry, warm, and windy here. I decided to cut up the limb with my Ontario camp machete rather than get out the chain saw. The limb wasn't that big. Just a few chops and my hand was stinging. This oak is like a rock. Its the kind of wood that you would rather saw than chop. I got out the Dog Father. The heavy blade and Res C handle made chopping much easier, but still hard. When I finished, I felt the edge and it needed a touch up. Just a few strokes with a steel and it was sharp as ever. I love this SR77 steel.

From my limited understanding:

SR-101 = 52-100 series ball-bearing steel

SR-77 - S7 series high-impact tool steel

IIRC... <img src="/ubbthreads/images/graemlins/smirk.gif" alt="" />

Horizon,
That is pretty much the way I heard it as well!!

The intro in the Scrap Yard Knife site says that Dan really liked the shock taking qualities of S-7. I think S-7 is the basis for SR-77. Dan's 40 hour heat treatment transforms the S-7 into SR-77. At least that is what I get from their own web site. All I know for sure is it is tough. I have pounded the Dog Father and the S6 through knotted, dry, hard liveoak with no damage or failures. I destroyed the edge on a Condor 420HC doing much less. And 420HC is not all that bad a steel for most uses.

S7 is what jackhammer bits are made out of. <img src="/ubbthreads/images/graemlins/eek.gif" alt="" /> And that’s “regular” S7, not SR77. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" /> That’s why they’re so tough and have no problems with concrete blocks. You could probably chop up your sidewalk if you wanted. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />

SR77 - The stuff you can use to chop up jackhammer bits! <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />

I would, but people will talk.