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Nicholson rasp?


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Are all USA nicholson made files and rasps hardnable? I cut a small section off and quenched in water. I proceeded to hit it with the hammer to get it to break, I wanted to see how brittle it becomes. I could not get the piece to break.

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Perhaps it was only case hardened?

 

Try forging it thin and quenching, then put it in a vise and get a pipe wrench on it. If it's worth your time for blade steel, it should snap with little effort. 

 

Edited by Will Wilcox
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Yes, that should harden well.  You have to be fast, though.  Less than one second to get it from 1475 degrees to below 900 degrees or it won't fully harden. 

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Thick pieces of hardened, untempered steel can be deceptively tough. That's why it's usually recommended to forge unknown steel thin and then quench test. It's much easier to see if it will snap or bend. 

 

Glad it worked out for you. 

 

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