I wonder if the new ones are the same, same factory so it might be similar levels, I was guessing it was high, mine is still shaving hairs 3 weeks in.Accutron wrote: ↑Sat Nov 14, 2020 6:07 pmThe only Seki K390 I know of that's been tested so far is the Police 4. Three different examples tested at 64.2, 65.2 and 65.5.
https://docs.google.com/spreadsheets/d/ ... 0iEWrdJGU/
Thanks you, that's the info I was looking for. it seems like a test from the newest recent batch as well, from the same batch I have, nice.
Wow, that's good!
Steel foundry HT recommendations are generally for applications other than knives.Accutron wrote: ↑Sat Nov 14, 2020 11:22 pm
Precisely. Additionally, a steels working hardness can change based on a particular heat treat. So the foundries general recommendations, nor their recommended heat treat is tailored for cutlery.The Meat man wrote: ↑Sun Nov 15, 2020 3:13 pmSteel foundry HT recommendations are generally for applications other than knives.Accutron wrote: ↑Sat Nov 14, 2020 11:22 pm
I'm stoked to hear that it's being run as hard as it is. I run my K390 Police at around 9~10 dps and it's tough enough for EDC even at that extreme angle.
The Delica has slightly thinner blade stock, so possibly a little, but the primary grind is probably the same.
I'd say yes. The Delica has thinner stock, and while the Delica isn't as thin behind the edge as one might expect, most P4s I've seen/heard about came a little thicker bte than the typical 20 thousandths on inch you usually see. I ended up thinning/convexing my edge a little by hand, and it cuts great now.
Accutron wrote: ↑Sat Nov 14, 2020 11:22 pmThis seems overhardened, particularly with the Delica's thin blade stock. Bohler's maximum recommended hardness is 64 HRC. K390's toughness isn't fantastic anyway, and at 66.5 HRC, it's getting down near Maxamet.nerdlock wrote: ↑Sat Nov 14, 2020 9:43 pmWow, that's good!
I just hope the upcoming P4 LW K390 will also be heat treated the same...couldn't find a good P4 G-10 nowadays.