Charlotte Posted July 3, 2009 Share Posted July 3, 2009 I know that 15 N 20 is frequently used as a constrast material. Someone asked me if it had any affect on carbon migration. I had to say I don't know. Has anyone look at this or should we just assume that it gets too thin to matter in pattern welded blades? Quote Link to comment Share on other sites More sharing options...
nonjic Posted July 3, 2009 Share Posted July 3, 2009 (edited) Its good practice to use it with a very similar steel, that doesnt have the 2% Nickle, 1080 is very close. That way migration isnt an issue, and it pretty well wants to weld, and H.T is a doddle. I assume that the carbon will migrate from the 15n20 though if welded with a different carbon content steel, its just the nickle molecules that wont migrate, as relativly their very big I think its just pure nickle that acts as a barrier and prevents C migration in a patternwelded billet. edit... (Udderholm C20 is near enough exactly the same steel as 15n20 without the 2% nickle so is the perfect match!) Edited July 3, 2009 by John N Quote Link to comment Share on other sites More sharing options...
viking-sword Posted July 3, 2009 Share Posted July 3, 2009 I myself wondered the same thing though I don't usually forge weld it with any really dissimlar steels. One thing that I have not seen ever( though I'm sure it's been done) is the making of a knife strictly from 15n20 It would be interesting to see how it test out. The only obstical I forsee is getting a thick enough bar of the stuff to start with as most of the time it's sold in the thin stock for the sole purpose of making damascus. Wes Quote Link to comment Share on other sites More sharing options...
781 Posted July 4, 2009 Share Posted July 4, 2009 Made filet knives out of it and it worked just fine. I also believe it is just pure nickel that the carbon will not migrate through. Anything else carbon migration occurs Quote Link to comment Share on other sites More sharing options...
tommerr Posted July 5, 2009 Share Posted July 5, 2009 Carbon monoxide will not migrate through the nickle phases. Quote Link to comment Share on other sites More sharing options...
Steve Sells Posted July 5, 2009 Share Posted July 5, 2009 How much Oxygen is bound up with the carbon in the steel matrix ? I am aware that nickel wont form carbides, but 15N20 is not an effective barrier to carbon migration in my experience, or the lab testing I have seen, we need a lot more than 2% nickel for that. Quote Link to comment Share on other sites More sharing options...
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