Thread: Best custom knife maker NZ

Double and triple tempering is effective with certain specific steel types in conjunction with cryo but its definitely not a one size fits all and for the most parts it shouldn't be necessary. Another thing to consider is that the more you temper the lower the final HRC will be.

I have a Von Gruff, I've seen another.
What I will say is he has a great reputation on the African forum and has sold high quality knives to many members.

That's not discounting others name here.
@cobber an NZHS member is a knifemaker too.

Originally Posted by Black Rabbit

I mean 3 times of tempering in different temperatures, and one final quenching on the edge. I was told by a Japanese metal engineer long time ago.

That's a process called normalising. It's used to refine the grain structure of the steel after forging and before austenitizing (hardening)

Essential process for a forged blade, you get big grain growth during forging due to the high temps which if left unchecked creates a brittle blade