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Old 11-08-2017, 07:41 PM
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Default fire striker hardness

Hello all, made a fire striker today and heated the edge up until it was yellow, then quenched it in water. now I read someplace that when it is properly harden, a magnet won't stick to it. well I stuck a magnet on it and it stuck. does that mean I have to reheat it and quench it again? thanks
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Old 11-08-2017, 08:19 PM
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Not sure what you are calling a fire striker. Got a pic?
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Old 11-08-2017, 08:21 PM
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The "Loss of magnetism" is for determining the transformation temp.

You need to check with a magnet "at heat".
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Old 11-08-2017, 08:25 PM
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Now I understand what he is making. Magnetism will still be there after hardening.
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Last edited by milomilo; 11-09-2017 at 09:50 AM.
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Old 11-08-2017, 09:06 PM
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here's the pic. but I guess I got my answer.
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Old 11-08-2017, 10:20 PM
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I should not be magnetic BEFORE you quench it, right when it is at full heat. After you quench it will be magnetic again. Now you know why they used to think this stuff involved magic
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Old 11-09-2017, 09:17 AM
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Then you have the 14% manganese steels which are not appreciably magnetic. They are heated and quenched to make them tougher and less brittle. Ass-backward from regular high-carbon steel.
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Old 11-09-2017, 03:06 PM
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Quote:
Originally Posted by Matt Shade View Post
I should not be magnetic BEFORE you quench it, right when it is at full heat. After you quench it will be magnetic again. Now you know why they used to think this stuff involved magic
so, am I suppose to stick the magnet on it while it's glowing hot, or is there another way? Thanks
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Old 11-09-2017, 03:13 PM
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Yes, as you're heating it, pull it out of the heat to see if it'll stick to a magnet or not. It'll be red hot. If it does, put it back in... If it doesn't, it's reached the temp you want.

Some people will mount a magnet to a long bar as a tool, others will just stick a magnet near the forge to test it.

There should be plenty of videos on YT showing that procedure as it's very common.
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Old 11-09-2017, 03:38 PM
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Quote:
others will just stick a magnet near the forge to test it.
over the years I've saved and picked up dozens of the magnets found mounted inside hard drives. Very strong and for their sizes. Most will have one angled tab that I will cut off if I want to mount the magnets flat on the backs.

I have one mounted to the outside of my forges hoods, even on the smallish drum or rotor forges. All ways handy, always there and easy to clean with air pressure.
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