Call for Charpy toughness samples

rodriguez7 said:
Ha, you never know! So it looks like it tested pretty good. And that’s at 61 rc. At 58 it should jump quite a bit according to Zapps chart. And this was all with low temper?
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I did one sample to start as there were questions regarding viability of low temper. I have samples coming up that should go down to Rc58, iirc. I tried to push it above Rc62, but the results got really inconsistent.
 
Willie71 said:
I did one sample to start as there were questions regarding viability of low temper. I have samples coming up that should go down to Rc58, iirc. I tried to push it above Rc62, but the results got really inconsistent.
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To me that’s actually really impressive! I’ve been tempering at 400, and ending up with 59-60. I’m guessing there will be a significant bump in toughness!
 
rodriguez7 said:
To me that’s actually really impressive! I’ve been tempering at 400, and ending up with 59-60. I’m guessing there will be a significant bump in toughness!
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I think I did 1925f, cryo, and 400 temper. I’d have to look at my list. I think this steel will be the toughest steel tested at lower hardness.
 
Larrin said:
Ok let me know. 300F was written on the bags.
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I think I did another sample later. This one was the 300f, as another Smith was looking for a protocol to get to Rc61/62. Once I tested the 300f temper, I didn’t walk it up. There’s a few more samples coming up.

Edit: I looked it up. I did z-tuff at 1900f, 1975f, and 2050f, cryo, and 400f tempers.
 
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I’m really looking forward to the V4e/4v to compare to z-wear and A2. I thought 3v would have been tougher given the low hardness.

There are higher hardness 3v samples coming up.
 
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So, is 8670 still the king of the hill? Second is Ztuff? Can’t say for sure with those graphics. Do you have exact numbers for each steel, Larrin Larrin ?
 
Larrin said:
8670 is still the highest, though at those toughness levels I’m not sure I can be confident one is better than another within a few ft-lbs.
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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.
 
At 58, I guarantee ztuff will beat the others out, no sure by how much. But I’m guessing it’ll be the toughest tested so far. 8670 is impressive for an ingot cheap steel! I would use it more if it the slightest rust resistance! But so far, ztuff is my favorite! But I tend to favor the tougher steels over the high wear steels!
 
Willie71 said:
I guess this answers the question of whether our home ovens are good enough for these steels. :cool::thumbsup:
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2rh43ki.jpg
 
Larrin said:
8670 is still the highest, though at those toughness levels I’m not sure I can be confident one is better than another within a few ft-lbs.
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Very interesting. 8670 is an economy steel with very basic heat treat, while Z-Tuff requires a much more complicated heat treatment besides costing 3 times as much as 8670. Except for the advertising benefit of saying Z-Tuff, 8670 seems to be the best value(for the specific project I have in mind.)
the old sailor
 
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scott.livesey said:
Very interesting. 8670 is an economy steel with very basic heat treat, while Z-Tuff requires a much more complicated heat treatment besides costing 3 times as much as 8670. Except for the advertising benefit of saying Z-Tuff, 8670 seems to be the best value.
the old sailor
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The main benefit in my opinion, with ztuff over 8670, is rust resistance, and wear resistance, plate quench vs oil. But I don’t think much more is involved in the heat treat. Some foil, and higher austenizing temps. But ztuff is like 4 times as expensive. And in the end I think ztuff will be the better steel, and tougher at the right hardness.
 
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