Magnetism after heat treating

TooQuiet

TooQuiet

Joined
May 5, 2011
Messages
306
I recently received some S35VN blanks back from heat treat and the are magnetic. I mean they will stick to other metallic objects. Is this normal or what happened?
 
Whack the spine on a wood bench. That will knock the magnetism out of them.
 
I happens all the time during the grinding process, especially if you ever used a welder's magnet or something similar to hold the blade.

Get a cheap de-magnetizer from Enco. I use one whenever I finish grinding a blade to get rid of any magnetism.
 
jonnymac44 said:
I happens all the time during the grinding process, especially if you ever used a welder's magnet or something similar to hold the blade.

Get a cheap de-magnetizer from Enco. I use one whenever I finish grinding a blade to get rid of any magnetism.
Click to expand...

This is exactly what I have and it works like a charm. Demagnetizes in just a couple seconds.
 
james terrio said:
I am at a complete loss to understand how that would have any effect at all. Please explain.
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The shock will knock the magnetic dipoles out of alignment and eliminate the steel's magnetic properties.

Or it is magic.... either answer works :)
 
Whacking a piece of slightly magnetized metal hard can make it slightly less magnetic, but a demagnetizer makes it totally non-magnetic.
 
bladsmth said:
Whacking a piece of slightly magnetized metal hard can make it slightly less magnetic, but a demagnetizer makes it totally non-magnetic.
Click to expand...

No, you can demagnetize an actual magnet permanently by striking it repeatedly on a hard surface. I have actually done it many times over the years. A few whacks of the spine of a knife on a wood bench will demagnetize it it permanently

It's science and only a Google away.
 
I do it when a blade or tool gets magnetic and I don't have time to go to the de-magnetizer. It works, but the piece seems to re-magnetize fairly easy. I also worry about damaging the blade when whacking it hard post-HT.
 
[video=youtube;v2EQWCpnIR8]http://www.youtube.com/watch?v=v2EQWCpnIR8[/video]

This guy was trying to de-magnetize a sword....
 
Omwow. That is one high quality sword. Every time I tap a drill bit I fully expect it to snap like that.. so far I've been lucky but I don't recommend doing it (as an addendum). I HAVE had one shatter from putting too much pressure on it during drilling and it bent slightly.. always wear goggles and preferably a leather apron! Scary as crap. Safety can never be emphasized enough in this hobby.
 
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