Hamon too soft

scott kozub

scott kozub

Joined
Jan 1, 2018
Messages
861
I'm working on a 7" nakiri in 1095. Its a full flat grind about 0.002 tbe with an edge hardness tempered to 63. As you can see in the pic the knife has a hamon. Its still rough but I may have a fatal problem.

The spin is so soft that the blade bends and sets way too easily. The edge passes the brass rod test fine but any flex on the spine warps the blade. I'm worried the the customer will bend it during use or washing.

Any thoughts or is this knife destined for the scrap heap?
 
Grind the edge back a bit and re-harden with more exposed edge. Perhaps raise the target temp about 15°, too.
What were the HT specs and methods.
 
Ground to about .040 and soaked for 10 minutes at 1475. Quenched in parks 50. As quenched I was getting 68 hrc which I thought was too high. Tempered twice at 350 and ground.

I just put a quick and dirty edge on it and beat a 2x4. Ended up rolling and a small crack. I was not easy on it.

Should I normalize before heat treating again? If I grind it back what thickness do you suggest? I think .030 will eat up about 1/3rd of the blade height? May become a slicer.
 
Just take it back to .020, normalize, and re-harden. Youi have nothing to loose by trying. I would worry most about that small crack propagating.
 
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