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Heat Treating and Metallurgy Discussion of heat treatment and metallurgy in knife making.

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Old 09-21-2017, 02:41 AM
Rasmus Kristens Rasmus Kristens is offline
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Join Date: Jul 2014
Location: Denmark
Posts: 185
Compare o1 to o2 steel


I got some B?hler o2 steel easily and cheaply available but I also have o1 steel availabe at a higher price.

I don't know much about metallurgy and i can't fine a proper comparision between o2 and o1 steel anywhere.

So i though, maybe some of you can tell me the pros and con by using one or the other steel.

B?hler o2 steel composition:
C 0.90
Si 0.25
Mn 2.00
Cr 0.35
V 0.10

Saxon o1 steel composition:
C 0.95
Si 0.25
Mn 1.20
Cr 0.55
V 0.20
W 0.50
S&P Up to 0.035

So if I understands this right (please correct me). The increased Mn in o2 makes it a deeper hardening steel, The increased Cr in o1 makes it more corrosions resistant, the increased W in o1 makes it keep an edge better. What is S&P?

If both steels are HT for their optimal properties, how much does these small differences actually affect the blade in the end?

I HT with charcoal fire and heated canola oil, so I have no chance of getting the optimal properties during HT. I like the idea that the steel isn't to expensive, but which sttel would i be able to get the most out of?

Last edited by Rasmus Kristens; 09-21-2017 at 04:13 AM.
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Old 09-21-2017, 08:10 AM
Kevin R. Cashen Kevin R. Cashen is offline
Join Date: Feb 2003
Location: Hubbardston, MI
Posts: 321
S&P = sulfur and phosphorus, both are bad for tool steels, so they saying how much of a minimum they keep it too. Both the Cr and the Mn are for increased hardenability, there is very little corrosion resistance offered from that level of Cr. The O-1 will edge out the O-2 on abrasion resistance, but with your setup the O-2 will be easier to optimize. I use both steels and like O-2 very much in Damascus as the Mn causes it to etch black as midnight.
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