Can 8670 be reheat treated?

T

TheEdge01

Joined
Apr 3, 2015
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Other than unknown steel, this is the first time I’ve had a blade not completely harden. My file would grab on the edge a little over half way up the blade. This knife is being made to sell so I certainly want to do it right. I heated the blade spine up so the edge wouldn’t over heat. After the blade started getting nice and red, I then started focusing on getting the tip up to temp, then I quenched in heated canola oil after the blade was evenly heated. I must have quenched too early or something.
Anyway, is it risky to attempt to re- harden the blade or should I scrap it and start over?
 
TheEdge01 said:
Other than unknown steel, this is the first time I’ve had a blade not completely harden. My file would grab on the edge a little over half way up the blade. This knife is being made to sell so I certainly want to do it right. I heated the blade spine up so the edge wouldn’t over heat. After the blade started getting nice and red, I then started focusing on getting the tip up to temp, then I quenched in heated canola oil after the blade was evenly heated. I must have quenched too early or something.
Anyway, is it risky to attempt to re- harden the blade or should I scrap it and start over?
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Best to do a subcritical anneal at 1200’f for two hours or go through the normalize and anneal cycles before reheat treating the blade.

Hoss
 
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