Magnetic metal lids

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Magnetic metal lids

This topic has 23 replies, 14 voices, and was last updated 4 April 2017 at 08:21 by John Haine.

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2 April 2017 at 12:14 #291776
John Munroe
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@johnmunroe13164
Hi all,

I'm trying to make around 100 metal lids (50mm x 50mm) that are magnetic and have brushed finishes. It's a shame that aluminium isn't magnetic. Is stainless steel my only alternative? I try to keep it cheap and simple.

Any thought appreciated.
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2 April 2017 at 12:14 #8643
John Munroe
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@johnmunroe13164
2 April 2017 at 12:17 #291778
Michael Gilligan
Participant
@michaelgilligan61133
Posted by John Munroe on 02/04/2017 12:14:20:

Hi all,

I'm trying to make around 100 metal lids (50mm x 50mm) that are magnetic and have brushed finishes. It's a shame that aluminium isn't magnetic. Is stainless steel my only alternative? I try to keep it cheap and simple.

Any thought appreciated.

.

You could, perhaps, make them out of Aluminium, then attach self adhesive Magnet strip.

MichaelG.
2 April 2017 at 12:21 #291780
John Munroe
Participant
@johnmunroe13164
Posted by Michael Gilligan on 02/04/2017 12:17:33:

You could, perhaps, make them out of Aluminium, then attach self adhesive Magnet strip.

Indeed. But I'm trying to make the whole lid magnetic whilst keeping the front and back a complete brushed finish.
2 April 2017 at 12:47 #291791
Michael Gilligan
Participant
@michaelgilligan61133
Ah … a specific interpretation of 'lid'

Looks like magnetic Stainless Steel might be your best choice.

MichaelG.
2 April 2017 at 14:52 #291808
Anonymous
"Cheap" ? Depends how magnetic you want it to be. The common stainless types are as good as non magnetic, from zero to slightly depending on how they have been worked. Would think the less common magnetic ferritic/martensitic types were more expensive
2 April 2017 at 15:58 #291818
JasonB
Moderator
@jasonb
You can put a brushed finish on mild steel do you need the non rusting properties of Stainless too?
2 April 2017 at 16:01 #291819
John Munroe
Participant
@johnmunroe13164
Posted by JasonB on 02/04/2017 15:58:15:

You can put a brushed finish on mild steel do you need the non rusting properties of Stainless too?

Yes, I'd prefer it to have non-rusting properties as it may be exposed to some moisture.
2 April 2017 at 16:25 #291821
Russell Eberhardt
Participant
@russelleberhardt48058
Mild steel and a coating of lacquer?

Russell
2 April 2017 at 17:17 #291828
Ed Duffner
Participant
@edduffner79357
Nickel sheet can be purchased with a brushed finish and has slow corrosion properties.

Ed.
2 April 2017 at 17:42 #291829
Keith Rogers 2
Participant
@keithrogers2
You can't magnetise Nickel

See OP.

Keith
2 April 2017 at 18:03 #291833
Bazyle
Participant
@bazyle
Nickel is magnetic. That's why stainless is non magnetic. At atomic level the nickel magnets align to the iron magnets and neutralise them so to speak.
2 April 2017 at 18:43 #291843
Keith Rogers 2
Participant
@keithrogers2
I apologise for that. Of course it is!

I was thinking of Nickel Silver which I believe isn't magnetic.

Keith
3 April 2017 at 08:04 #291888
Russell Eberhardt
Participant
@russelleberhardt48058
Posted by Ed Duffner on 02/04/2017 17:17:34:

Nickel sheet can be purchased with a brushed finish and has slow corrosion properties.

Ed.

But the OP did say, "I try to keep it cheap and simple. " Nickel is not cheap, well it wasn't when I last bought some.

Russell.
3 April 2017 at 08:42 #291893
Michael Gilligan
Participant
@michaelgilligan61133
This may be of interest:

[quote]

Is stainless steel non-magnetic?

It is commonly stated that “stainless steel is non-magnetic”. This is not strictly true and the real situation is rather more complicated. The degree of magnetic response or magnetic permeability is derived from the microstructure of the steel. A totally non-magnetic material has a relative magnetic permeability of 1. Austenitic structures are totally non-magnetic and so a 100% austenitic stainless steel would have a permeability of 1. In practice this is not achieved. There is always a small amount of ferrite and/or martensite in the steel and so permeability values are always above 1. Typical values for standard austenitic stainless steels can be in the order of 1.05 – 1.1. See Composition effects on the magnetic permeability of austenitic stainless steels

It is possible for the magnetic permeability of austenitic steels to be changed during processing. For example, cold work and welding are liable to increase the amount of martensite and ferrite respectively in the steel. A familiar example is in a stainless steel sink where the flat drainer has little magnetic response whereas the pressed bowl has a higher response due to the formation of martensite particularly in the corners.

In practical terms, austenitic stainless steels are used for “non-magnetic” applications, for example magnetic resonance imaging (MRI). In these cases, it is often necessary to agree a maximum magnetic permeability between customer and supplier. It can be as low as 1.004.

Martensitic, ferritic, duplex and precipitation hardening steels are magnetic.

[/quote]

.

From: **LINK**

http://www.bssa.org.uk/faq.php?id=24

.

MichaelG.
3 April 2017 at 10:31 #291905
Circlip
Participant
@circlip
And Martensitic "Stainless" steels, usually employed in the manufacture of high temperature fastenings WILL rust.

Another non theoretical fact.

Regards Ian
3 April 2017 at 17:50 #291943
mark costello 1
Participant
@markcostello1
400 series SS is magnetic.
3 April 2017 at 17:55 #291945
MW
Participant
@mw27036
Well given the large amount of iron that make up steels, it stands to reason that it would maintain some magnetic property even after the inclusion of non-ferrous elements.

Michael W
3 April 2017 at 19:03 #291956
Michael Gilligan
Participant
@michaelgilligan61133
Posted by Circlip on 03/04/2017 10:31:40:

And Martensitic "Stainless" steels, usually employed in the manufacture of high temperature fastenings WILL rust.

.

… but they do stain less than some other steels

Rejoice in the subtlety of the English language

[ Stainless doesn't necessarily mean unblemished or unblemishable. ]

MichaelG.
3 April 2017 at 20:32 #291965
Neil Wyatt
Moderator
@neilwyatt
Posted by Michael Gilligan on 03/04/2017 19:03:33:

Posted by Circlip on 03/04/2017 10:31:40:

And Martensitic "Stainless" steels, usually employed in the manufacture of high temperature fastenings WILL rust.

.

… but they do stain less than some other steels

Rejoice in the subtlety of the English language

[ Stainless doesn't necessarily mean unblemished or unblemishable. ]

Less as a suffix means 'without'.

Wiktionary: "From Middle English -les, -leas, from Old English -lēas (“-less”), from lēas (“devoid of, loose from, false”), from Proto-Germanic *lausaz (“loose”). (Not related to less, which derives from *laisiz, *laisizô.)"

This may leave me friendless and I know it's heartless of me to say so, but I must be fearless not gutless as your shameless sophistry generated a worthless posting, unlike your usual peerless contributions and tireless curation of our meaningless excursions into the boundless expanses of the English language.

Neil

P.S. Please forgive
3 April 2017 at 21:41 #291977
Michael Gilligan
Participant
@michaelgilligan61133
3 April 2017 at 21:51 #291980
Michael Gilligan
Participant
@michaelgilligan61133
I believe you admire Wikipedia, Neil … so please forgive me for supplying one brief quote therefrom, instead of fully documenting my argument

Stainless steel does not readily corrode, rust or stain with water as ordinary steel does. However, it is not fully stain-proof …

**LINK**

https://en.m.wikipedia.org/wiki/Stainless_steel

… You will, I suspect, recognise the similarity with ShatterProof vs. Shatter-Resistant, as recently discussed.

MichaelG.

.

Edit: predictably … I can't just leave it at that, so see here:

http://www.ancare.com/our-products/stainless-steel

Edited By Michael Gilligan on 03/04/2017 21:59:42
3 April 2017 at 22:13 #291987
SillyOldDuffer
Moderator
@sillyoldduffer
Posted by Neil Wyatt on 03/04/2017 20:32:41:

Posted by Michael Gilligan on 03/04/2017 19:03:33:

Posted by Circlip on 03/04/2017 10:31:40:

…

.

…

…

This may leave me friendless and I know it's heartless of me to say so, but I must be fearless not gutless as your shameless sophistry generated a worthless posting, unlike your usual peerless contributions and tireless curation of our meaningless excursions into the boundless expanses of the English language.

Neil

P.S. Please forgive

Careless work Neil – surely 'Less is More' , ho ho.
4 April 2017 at 08:21 #292019
John Haine
Participant
@johnhaine32865
Well, all our stainless steel kitchen knives fell off the magnetic rack as I was reading this thread….

The power of faith.
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