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#1 (permalink)      4/16/2014 12:48:02 AM US Central   quote/reply + tips
keenears
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Not SS?
Hello. Got this one arrived yesterday and used a neodymium magnet to check what the parts are made of. It`s turned out that everything (base, top cap, driptip) has very low magnetics, except for the screws.
So will I be right to conclude, that this RDA is not made from SS ? I`d better avoid to do a scratch tests...
#2 (permalink)      4/16/2014 1:03:48 AM US Central   quote/reply + tips
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Big_Black_Tools
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Screws are IRON (you can buy SS ones in a computer shop)
Size is generally M2/M3 x 0.4/0.5mm

SS is poorly 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.


Edited on 4/16/2014 at 1:09 AM. Reason:
Let'em eat ©opy®ight$ !
#3 (permalink)      4/16/2014 1:53:13 AM US Central   quote/reply + tips
keenears
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Thanks for the knowledge =) Well, i can try to scratch it later on ocasion...