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Quench error blistering steel?


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Trying to figure out why I have these "blisters" on my steel. It is leaf spring steel and didn't develop these marks until quench. I used clean motor oil and preheated it beforehand.  And does this mean I need to start over?

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Edited by Stephen Ray
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  • Stephen Ray changed the title to Quench error blistering steel?

That's called frogskin, and means you overheatwd the steel by a couple hundred degrees.  It happens. 

However, lose the motor oil.  It is not good for quenching since it absorbs water from the air and gets radically faster (or slower) depending on the additives.  Straight canola ia far better.

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Posted (edited)

Does it invalidate my blade for more work? The frogskin I mean

Edited by Stephen Ray
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No, it just means you need to do a few normalizing cycles to reduce the grain size and then redo the hardening. 

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Thank you, I am thrilled to hear that.  I actually have a buyer for this one. I would hate to have to start over.

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