Call for Charpy toughness samples

Gossman Knives said:
Thanks
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Send an S7 coupon heat treated by you to Larrin, Scott! Let this steel be the number one (or two, Warren has heat treated a Maraging steel I’ve sent him, Ultrafort, that, on theory, should be the king of the hill regarding toughness:D) on his toughness tests! If you could include your cpm1v also, it would be perfect!!!:thumbsup::thumbsup::thumbsup:
 
Willie71 said:
I’m pretty sure both steels will be much tougher yet at Rc58-60. It’ll be interesting to see how 15n20, 80crv2 and L6 compare. It looks like 3v is very tough, but not in the same league as z-tuff and 8670.
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3v is not in the same league as well heat treated 5160, 8670, Ztuff, 1v, S7, A8mod (we will see in the tests) and NZ3 (S1). Good steel, no doubt, for a medium sized knife, though.
 
As we have not seen the S7 test yet, do you think that 8760 and 5160 are in the same range? The chart seems to put 3V, 5160, 8760 and Z Tuff all in the same area of the graph, albeit with the Z Tuff being at a much higher hardness level. All above AEB-L.
The TOP end of the chart is turning out to really only have one surprise for me, that being AEB-L. Once you get your head around how tough that stuff is, it makes sense that 19C26 would be where it is, etc. No psurise that CPM 154 did fairly well too. Would like to see where Elmax fits in. It should slot in above 390. The bottom end has a few more, mostly highly regarded stainless steels like Niolox, but A2 is also unexpectedly farther down the chart. The simple alloy steel seems to have performed about like we expected them to. 52100, CFV and O1 pretty much performed like I thought they might and at good hardness levels to boot. One thing that I am still wondering is how much, if any, the added silicon in 9260 would change the performance compared to 5160 on a Charpy test?
hugofeynman said:
3v is not in the same league as well heat treated 5160, 8670, Ztuff, 1v, S7, A8mod (we will see in the tests) and NZ3 (S1). Good steel, no doubt, for a medium sized knife, though.
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jdm61 said:
As we have not seen the S7 test yet, do you think that 8760 and 5160 are in the same range?
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Yes, I think. 8670 revealed to be a bit tougher. But they may be equally tough, we shouldn’t forget that 5160 heat treatment included cryo and 8670 didn’t. Some RA could be the reason 8670 was above 5160, regarding toughness.
 
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So we are still waiting for the results of the L6 and 15N20 tests so we can see if nickel truly rules!!!!:D
hugofeynman said:
Yes, I think. 8670 revealed to be a bit tougher. But they may be equally tough, we shouldn’t forget that 5160 heat treatment included cryo and 8670 didn’t. Some RA could be the reason 8670 was above 5160, regarding toughness.
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jdm61 said:
So we are still waiting for the results of the L6 and 15N20 tests so we can see if nickel truly rules!!!!:D
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I’m sure the nickel in ztuff contributes to the toughness. But so does the cpm technology. I’m thinking ztuff at 58 will be way ahead of most of these steels. What I’m really liking about this steel, is the ability to run it harder then usual, and retain that crazy toughness! I think it’ll be an awesome steel for a nice thin hunter/skinner. Run around 62 rc, and it’ll still be plenty durable.
I’m curious to see if A8 mod will be up there with 8670. The only real downfall with 8670 is it’s lack of rust resistance. But it’s a nice cheap steel.
 
jdm61 said:
So we are still waiting for the results of the L6 and 15N20 tests so we can see if nickel truly rules!!!!:D
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Don’t forget that nickel helps in cold weather to retain toughness. I’d like to get z-tuff in 0.100” thickness for skinners.
 
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