Post HT grinding

WaltE99

WaltE99

Fickle Bastard Blades
Joined
Oct 5, 2015
Messages
179
Yesterday I was post HT grinding and burned a small spot on the edge of the blade. This burn was not at the tip. Is this a throw-away or can I re-temper and be OK?

Thanks!

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Any spot that got hotter than your tempering temp will not hold an edge as well. If it was a small spot and you're not selling it I wouldn't worry about it. If you want to fix it then reheat treat it or grind up past it. Post a pic.
 
Thanks. I don't have a photo and finished the blade on out as it was nearly finished when the burn happened so the spot was ground away.

Does it need full heat treat again or just tempering?

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You would need to heat treat (hardening and tempering both) all over again. Tempering at this point wouldn't have any beneficial effect in regards to saving the spot you overheated on the edge.

I'd advise grinding your thin edge back a bit so that it has some thickness to it before quenching/hardening to avoid getting a rippled edge.
 
Thanks. This blade is O1 which I send to Peter's Heat Treat. Will this need to be annealed or normalized or can it go straight to HT and temper?

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Another option is make the knife smaller. Grinding 1/8" off the edge could be enough to get you into harder steel. Basically grind off the discolored area and resharpen.
 
You said you ground it back so why don't you test it before sending it back out? Does it skate a file? Brass rod test?
 
what color was the burn? if it was brownish i would brass rod test it before considering it unusable. if it was blue it ruined the temper.
 
Thanks guys! What is the brass rod test? I'll try that and to see if it will skate a file. I really wish I had taken a pic. The color was definitely brown but there may have been some blue in the center.

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