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You are here: Home » News & Events » Is stainless steel 304 non-magnetic?

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Is stainless steel 304 non-magnetic?

Views:13     Author:Site Editor     Publish Time: 2017-08-22      Origin:Site

Is stainless steel 304 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.




D&D Hardware provides high quality, durable hardware products to consumers, distributors and manufacturers. Our products, which include  Door Hinges, Mortise Locks,Lock Cylinder, Panic Exit DeviceDoor Closer Lever HandlesDoor StopersDoor Boltsetc.

D&D Hardware are manufactured with 304, 316 grade stainless steel to provide enhanced durability and corrosion resistance.

 
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