ring spots after quench

R

Rey

Well-Known Member
After quenching in oil " transmission oil, or vegetable oil" blade gets this bubble looking scales. I usually have no choice but, to scuff to take off. What is the cause of this scales to get on the blade during quench?.:confused:
 
Some of it is decarb scale. Some is burned oil scale. Soak in vinegar overnight and it will remove and loosen some of it, but to get it bright and clean, you will have to sand it. Hand, or power.
 
Like LRB said It's decarb Scale, happens alot when you dont have the air mixture in your gas forge just right, causes bubbles to form under the scale leaving spots like that, if you etch it in acid you will sometimes see the spots again.
 
Rey said:
After quenching in oil " transmission oil, or vegetable oil" blade gets this bubble looking scales. I usually have no choice but, to scuff to take off. What is the cause of this scales to get on the blade during quench?.:confused:
Click to expand...

I just scuff it off with a scotchbright belt on my grinder.
 
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