A6 steel

A8 is one of the steels on my list that I want to to try out. I have a huge excevator chisel that should be S7, but no way to break it down to a workable stock for stock removal. Both should be great steels for a thin machete or a large chopper knife like the one shown by Scaniaman.
 
Scaniaman said:
I made a knife out of A8 Mod @ 61 hrc and did kind of a destruction thing on it in the end 🙈
It was just impossible to chip or crack.. It just deformed in the end. It had a pretty slim convex geometry. I plan to use more of this steel.

gwaNwTI.jpeg
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Is this A8mod from AKS? How much rust resistance it is?
 
Scaniaman said:
I made a knife out of A8 Mod @ 61 hrc and did kind of a destruction thing on it in the end 🙈
It was just impossible to chip or crack.. It just deformed in the end. It had a pretty slim convex geometry. I plan to use more of this steel.

gwaNwTI.jpeg
Click to expand...
Yea it seems in line from what I've heard about A8 and A8 modified. A8 is supposed to be slightly more tougher than A8 modified, but less wear resistant. But 99% of people will never be able to tell the difference since the difference between the two is not significant. I have seen a guy bend a heat treated bar of A8 that was 60rc in a vice. He flexed it to 90 degrees and it flexed back, on his second attempt he flexed it beyond 90 degrees and the bar took a permanent bend, but did not snap or break. It was quarter inch thick and 1 inch wide. There are still images on Google if you search for it. Also most people say 5160 is tougher but the specs on toughness for A8 are really high. A8 at 59rc has a charpy impact value of 160 joules or 118fp. For comparison CPM -3V has a charpy impact value at 59rc of 100 joules. S7 at 58rc has a charpy impact of 165 joules. A2 at 60 rc has a charpy impact of 40 fp or 54 joules. I recall seeing 5160 charpy impact at 80fp or 108 joules, which puts it bellow A8. But I can't find that graph so I'm not gkna rely on that number. I do know L6 tends to be tougher than 5160 and L6 has the same toughness as A8 on at least 3 seperate toughness graphs i have, so I would say A8 is just as tough as 5160 if not tougher.
 
FredyCro said:
A8 is one of the steels on my list that I want to to try out. I have a huge excevator chisel that should be S7, but no way to break it down to a workable stock for stock removal. Both should be great steels for a thin machete or a large chopper knife like the one shown by Scaniaman.
Click to expand...
 
I was shocked to find out that there is not a huge difference between A8 and S7 in terms of toughness. A8 at 59rc has charpy impact value of 160 joules or 118fp. S7 at 58rc has a charpy impact value of 165 joules. So the shock resistant steel is only 5 joules higher in toughness but at 1rc lower. So you can say they are basically on par when it comes to toughness. However I think A8 will have better wear resistance. I currently have two knives in A8. One is a Japanese Tanto. The other one is a combat/ survival knife. You can find them on Ali Express, if you type in A8 knives. I bought the dog soldier Busse clone knife made in A8. I thought it was ironic since for years people said INFI was basically a tweaked version of A8 with proprietary heat treat.
 
Scaniaman said:
I made a knife out of A8 Mod @ 61 hrc and did kind of a destruction thing on it in the end 🙈
It was just impossible to chip or crack.. It just deformed in the end. It had a pretty slim convex geometry. I plan to use more of this steel.

gwaNwTI.jpeg
Click to expand...
That's beautiful, and looks functional too! 😁👍🇦🇺
 
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