monete3
Joined: 4-Jul-2012
Posts: 107
Posted: 5-Dec-2013, 13:40
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Posted: 5-Dec-2013, 13:40
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The metal of the 2 types of coin is steel on numismaster.com...
Here on numista is stainless steel.
In both cases they should be magnetic.
I own 5 taka 1996 which is not magnetic.
Is it a new type not catalogued yet.
Thank you for every reply.
jbreynolds
Joined: 3-Jul-2012
Posts: 106
Posted: 5-Dec-2013, 17:17
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Posted: 5-Dec-2013, 17:17
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Not all stainless steel is magnetic.
monete3
Joined: 4-Jul-2012
Posts: 107
Posted: 5-Dec-2013, 18:41
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Posted: 5-Dec-2013, 18:41
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Thank you for the information...I didn't know stainless steel can be not magnetic
Anyway according to me the coin I own is aluminized steel.
What do you think about it?
Kuna
Joined: 18-Feb-2013
Posts: 873
Posted: 5-Dec-2013, 18:49
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Posted: 5-Dec-2013, 18:49
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Hi! It depends on magnet You use. I think that all Stainless steel should be magnetic. As I know, the best magnet for coins is the "silver one".
"Black magnet" isn't so strong as the "silver one".
I recommended to all to use the first one because only then You can be sure of fake or real silver coins because if You use little magnet, coin wouldn't be magnetic because silver plated could be thin.
Regards
Kuna
Check my doubles. ;)
Cerulean
Joined: 1-Nov-2010
Posts: 1821
Posted: 5-Dec-2013, 18:56
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Posted: 5-Dec-2013, 18:56
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In general, stainless steel is an alloy of steel and chromium. Steel is magnetic, but chromium is not. As more chromium is added to the alloy, the magnetic properties of the alloy become weaker.
jbreynolds
Joined: 3-Jul-2012
Posts: 106
Posted: 5-Dec-2013, 19:04
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Posted: 5-Dec-2013, 19:04
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http://en.wikipedia.org/wiki/Stainless_steels
"There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures. For greater hardness and strength, more carbon is added. With proper heat treatment, these steels are used for such products as razor blades, cutlery, and tools."
http://www.worldofcoins.eu/forum/index.php/topic,12316.msg92278.html#msg92278
http://www.worldofcoins.eu/forum/index.php/topic,12316.msg92303.html#msg92303
The 1996 5 taka is non-magnetic. As far as I can determine, all 5 taka pieces prior to 2008 are non-magnetic as well.
ArnoV
Joined: 23-Nov-2011
Posts: 1152
Posted: 5-Dec-2013, 21:46
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Posted: 5-Dec-2013, 21:46
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There is a bunch of Italian WWII coins made of stainless steel which appear both in a magnetic and non-magnetic variant.
This kind of variation deserves a KM-subnumber.
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