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Show HN: I built a knife steel comparison tool

new.knife.day

21–30 of 89 posts

Re: Show HN: I built a knife steel comparison tool

#21

Anyone else like ceramic knives? I have a couple paring knives. Super sharp but very brittle.

I haven't used one for food yet, but I picked up a cheap ($35) kyocera as a workshop knife and it's been great; dropped it on concrete and knocked a 1mm² chunk off of the very tip, but the edge is still great after six months of casual abuse (mostly cardboard, rubber, and plastics.)

Re: Show HN: I built a knife steel comparison tool

#22

Anyone else like ceramic knives? I have a couple paring knives. Super sharp but very brittle.

I would never buy a knife you can’t sharpen. Nothing stays sharp forever.

They can be sharpened to a very sharp edge that they retain for a long long time.

In my vague home use, brittleness leading to chipping is more of an issue.

Re: Show HN: I built a knife steel comparison tool

#23

Earlier quoted context omitted.

Shhh, I like those placeholders as dead giveaways that content was AI-produced. Don’t call too much attention to them or we’ll lose this way of identifying slop :)

I'm fine with ai slop if it provides value, the value here being questionable, because now I don't know if the values in the comparison are fact checked or hallucinations.

I suspect they're hallucinated. As a random spot check: https://new.knife.day/item/spyderco-paramilitary-2

"The Spyderco Paramilitary 2 is a tactical knife with a 3.44 inch blade. The knife is made in USA of CPM S35VN steel."

It's a real knife, and the blade length checks out (to two significant figures), but the manufacturer spec sheet says S45VN steel. Also the actual name is "Para Military® 2".

https://www.spyderco.com/catalog/details/C81GS2/2090

Re: Show HN: I built a knife steel comparison tool

#25

As a knife-maker, may I request 80CRV, 1084, and 1075? They're very commonly-used steel grades in knives. Also, 440 has a number of grades. Cool tool! EDIT: It might also be interesting to point out the manganese levels, and whether the steel is a deep- or shallow-hardening steel. Those factors help indicate whether the steel will form a hamon or not.

yes, I will add this info.

thanks for the feedback

Re: Show HN: I built a knife steel comparison tool

#26
post #16

Hmm, it feels like there'd be some interesting crossover between this and https://seattleultrasonics.com/pages/knife-database but while the "Quantified Knife Project" has a lot of numeric test-result data, it looks like they only have "marketing names" for the steel used (if you click through the links in the "model name" column for each knife.) (Ah, the raw data is available https://github.com/seattleultrasonics/Qua…

thanks for sharing, i will check these out... previously was unaware of these

Re: Show HN: I built a knife steel comparison tool

#27

I looked through most of the charts, and I it seems like you cannot get the best of two worlds. Can you get good edge retention, ease of sharpening and toughness at the same time? It would be nice with an example on how knife steel properties work. I assume there are balanced tradeoffs.

that is correct, edge retention, ease of sharpening and toughness usually come at a trade off to one another.

A harder blade is more brittle (less tough) and keeps its edge longer... but is also more difficult to sharpen once it gets dull.... generally speaking.

Re: Show HN: I built a knife steel comparison tool

#28
post #10

Earlier quoted context omitted.

It's not hard, just expensive. You need to pay a lab to do it, and the testing is very much destructive most of the time.

XRF might be able to non-destructively tell you the alloy.

The magic spice gun was my first thought as well, but they struggle to measure lighter elements like carbon.

Re: Show HN: I built a knife steel comparison tool

#30
post #23

Earlier quoted context omitted.

I'm fine with ai slop if it provides value, the value here being questionable, because now I don't know if the values in the comparison are fact checked or hallucinations.

I suspect they're hallucinated. As a random spot check: https://new.knife.day/item/spyderco-paramilitary-2 "The Spyderco Paramilitary 2 is a tactical knife with a 3.44 inch blade. The knife is made in USA of CPM S35VN steel." It's a real knife, and the blade length checks out (to two significant figures), but the manufacturer spec sheet says S45VN steel. Also the actual name is "Para Military® 2". https://www.spyderc…

this data is mostly scraped from a few large knife retailers, so should be accurate.
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