Magnetic Vs Non-Magnetic. - Coin Community Forum

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Author	Replies: 4 / Views: 2,729
David Graham Pillar of the Community Australia 1611 Posts	Posted 06/21/2020 03:45 am Hi Am currently sorting some 1939-1943 Italian 20 centisimi coins. Numista states that some are magnetic and others are non-magnetic. Some coins definitely stick to the magnet however other coins, although they stick to the magnet, only just hold and are easily removed. Are these magnetic coins that have lost some magnetism or does non-magnetic mean 'almost' non-magnetic? Ta Report this Post to the Staff

John1 Moderator United States 56855 Posts	Posted 06/21/2020 04:10 am I think you are right. If magnetic it "will" stick and if non magnetic they may "almost" stick. Is there a weight difference between the two? John1 Edited by John1 06/21/2020 04:10 am Report this Post to the Staff
Gincoin43 Pillar of the Community United States 1543 Posts	Posted 06/21/2020 04:33 am They are both steel, just with different structures. Austenitic Stainless Steel is "mostly" non-magnetic. Formations of ferrite can make the steel partially magnetic. IF there is a weight difference is would be negligible. Report this Post to the Staff
kanga Pillar of the Community United States 5825 Posts	Posted 06/21/2020 09:41 am Nickel is mildly magnetic and MANY modern coins are struck in cupronickel. I believe that niobium magnets are VERY strong and will work well on cupronickel coins. Also I think cobalt is mildly magnet. Report this Post to the Staff
David Graham Pillar of the Community Australia 1611 Posts	Posted 07/01/2020 6:35 pm Ah. The plot thickens. From memory there was no weight difference. I will stick weakly magnetic being the same as non-magnetic. Thanks for the responces. Report this Post to the Staff
	Replies: 4 / Views: 2,729

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