S7 (SR-77) tool steel.

M

Michael.D

Joined
May 29, 2003
Messages
104
Hi,

I just bought Scrap Yard Dumpster Mutt DC, but the S7 steel is big mystery for me.
Could some one drop few lines how this steel compare to other carbon/tool steels. How good is SYCO at heat treating, will wear resitance be better than in other production knives made from 1095, 50100-B (0170-6C/ Carbon V), A2, D2 ?
 
Wear resistance will be less than D2 and A2; impact resistance will be several times higher.

S7 is one of my favoritest steels and I'm sure SR-77 has the potential to be better.
 
scrapyards/Busse's heat treat is THE BEST...
it's what makes good steel GREAT.
:D
sr77 holds a pretty good edge (better than I expected from this steel) and is crazy tough and VERY easy to sharpen.

it's awesome! :D
 
Hope this compilation of images from Crucible website I made while ago will help you understand S7:

CPM-06.jpg


Also Busse have some special HT for theit steels so they call them SR77 and SR100.

Thanks, Vassili.
 
Sr-77 has great edge holding capabilities and extreme toughness.
I have used several of my scrappers very hard like choping bone and chain link fence, opening cans, battoning frozen hardwood, chopping ice, and battoning with granite rocks.
During this test the knife had no chips and only small dents on the spine from the granite.
Easier to sharpen than 1095 and holds an edge much longer.
Use your DCDM hard, they are the best users.
 
nozh2002 said:
Hope this compilation of images from Crucible website I made while ago will help you understand S7:

CPM-06.jpg


Also Busse have some special HT for theit steels so they call them SR77 and SR100.

Thanks, Vassili.
Click to expand...

- Longer than 1095 ? If yes, am more than happy.

- Approximately what percentage will wear resistance be lower comparing to SR-101 ( 52100) ?



What i really like in Busse Combat family knives is the Res-C handles(shock absorbing, 3-D contoured and very grippy) and their guarantee.

 
Is that stripped howling rat and battle rat yours? If so very nice!

Sr-101 holds an edge longer but isnt as tough(of course swamp rat knives are very tough), sr-101 is also alittle less rust resistant.
Sr-77 is tougher, doesnt hold an edge as good as sr-101 but sharpens easier, and doesnt rust as much as sr-101.
Currently Scrap Yard is the only company in the Busse family that uses res-c.
I prefer Sr-77 over Sr-101 because I use my knives hard and the tougher steel and res-c handles makes for great users.
 
I dont agree with that chart compleatly as the heat treat is very important.
Thinking steel only is like living in a 2d world.
 
macgregor22 said:
I dont agree with that chart compleatly as the heat treat is very important.
Thinking steel only is like living in a 2d world.
Click to expand...

This is true in general and poorly heat treated good steel will perform worse then average steel with very good heat treatment. However we are assuming here that all steel are heat treated according to specification and I can imagine that Crucible know how to do HT for steels they produce.

So, you can disagree with this chart but D2 will not have better wear resistance then CPM S90V until it is ruined by wrong heat treatment.

After all, Crucible produces all this different steel for the reason - they are different! One can performs better then other but cost more etc. With proper heat treatment of course.

Some knifemanufacturers uses cheap steels, but makes excellent heat treatment. They produce good knifes in result having good profit. But this knives will not perform better then same knives with top steel with good heat treatment.

Buck producing excellent knives with 420HC directly stated that same Buck 110 limited edition with CPM S30V (from Cabelas) of course outperforms Buck 110 with 420HC. No heat treatment can make average steel better then top steel (if it also heat treated according to specification).

Thanks, Vassili.
 
I agree with you.

I should have been more clear, I was talking about the Busse heat treat applyed to Scrap Yard knives.
 
I don't understand why everyone isn't using 9V - that stuff looks like the bomb!!!
 
fishface5 said:
I don't understand why everyone isn't using 9V - that stuff looks like the bomb!!!
Click to expand...

It has this superior values at 50HRC or something... I was mistaken at the beginning too, but later Crucible add this info and everything became clear.

Thanks, Vassili.
 
There is a point at which wear resistance works against you in ease of sharpening
 
hlee said:
There is a point at which wear resistance works against you in ease of sharpening
Click to expand...

In theory only. I am looking forward to see this "hard to sharpen" steel, but so far most promising steels or let say steel which some manufacturer prefers to present as hard to sharpen and so not good to their customers - all that "sharpen scary" steel can be sharpened just fine to hair whittling sharpness...

Thanks, Vassili.

P.S. However yes wear resistance means hard to grind with cheap belt and so less profit and so not good to manufacturers. This is why best steels are in use for production only by few manufacturers who has no compromises in quality, but only in limited runs...
 
No I injured my arm by cutting too much rope and stop testing, until it heals completely (if it will).

Thanks, Vassili.
 
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