Switch to full style
Post a reply


Fri Jul 05, 2013 8:13 am

Hello all,

I have a question on sharpening HAP40 steel and maybe someone can help.

Recently, I bought a GIHEI knife (210 mm Gyuto, san mai with HAP40 steel). It's a nice knife, but OOTB not super-sharp.

I do my sharpening with a Belgian blue stone and Naniwa Super (800/5000). Afterwards some stropping on leather and blue polishing paste. This works well with my other knives (Global and an Eden Blue#2).

The HAP40 takes forever to be only slightly affected by this. On the one hand very impressive but not convenient.

Am I using the wrong stone or should I be more patient?

I am also thinking about stropping on balse with CBN, but before investing I'd like to know if this is a good idea with HAP40.

Really looking forward to hear opinions,


Re: HAP40

Fri Jul 05, 2013 4:54 pm

VRANC <> I've never dealt with the steel, but when dealing with wear resistant steels like it or M390... diamonds are your friend. Get your edge on the diamond, then finish with stones.


Re: HAP40

Sun Jul 07, 2013 3:43 am

Thanks for the advice. Sounds logical. What grit size(s) would i need to do this?

Re: HAP40

Sun Jul 07, 2013 2:53 pm

It's up to you. The 140 will make short work of most things. You can move up to the 600 from there and then switch to a 1K stone and work your way up as far as you like from there.
Post a reply