View Full Version : UHB17Va in Lauri blades

05-30-2003, 02:16 AM
Does anybody try or test what is UHB17Va?
Laury make nice and cheap blades out of it and they are pretty sharp. They progressively temper it up to 62 HRC - I do not know anybody else selling such hard blades.
Composition is close to O1
UHB17Va: C=0.85 | Cr=0.54 | Mn 0.55 | P=0.02 | Si=0.3 | S=0.02 | V=0.2
O2: C=0.85-1 | Cr=0.4-0.6 | Mn=1-1.4 | Ni=0.3 | Si=0.5 | V=0.3
Thanks, Vassili.

Jerry Hossom
05-30-2003, 08:43 AM
It sounds like it might be a Udeholm steel from Sweden, judging from the initials. I'm not familiar with it, nor am I aware if it's sold here in the US.

By progressive temper I assume you mean it's edge hardened with a softer spine. That would make a lot of sense, though it would be difficult to do in a production setting. Is there anything online about these knives? What kind of knives are they?

05-30-2003, 12:18 PM
Yes it is an Uddeholm steel used in air compressor clapans and car shock absorbant clapans.
selling it and it is almost nothing about it in internet.

So, I though may be somebody like it too (as I do)? But my love is irrational so far :). I like to see some test results, comparison...

They manage to harden edge to 62 keeping blade at 52 and I think they are doing this in production.
Thanks, Vassili.

Jerry Hossom
05-30-2003, 01:22 PM
With proper heat treating, O1 easily hits Rc62, but few knife factories will take that or any other steel to that hardness for fear of it breaking or chipping on hard use. The edge hardening does take care of the likelihood the blade will break, but a thin edge still might chip or crack if abused. Most custom makers will take tool steels to about Rc62 though, usually edge hardened.