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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Removing magnetism from stainless steel 304

Q. I want to remove magnetism from stainless steel 304 Products after they are cold worked.
thanks.

Shahzad Amin
factory - Pakistan
2005

Q. Please tell me the ways to get rid of magnetic property of my cold worked stainless steel 304 hinges, as my customers are not in the sense of magnetic property in steel.
Please reply to me soon by mechanical means.
Thanks
qaisar

qaisar abbas
home - Pakistan
2005

2005

A. If your parts are magnetic, i.e. they will stick to a piece of iron, then you can run them through a degausser. That electrical instrument will expose the parts to alternating polarity, continually decreasing magnitude magnetic fields. This will remove residual magnetism.

If you want your cold worked 300 series stainless steel parts to be paramagnetic rather than ferromagnetic, then you need to anneal them. My preference is to do so in accordance with AMS2759/4, as I believe it sets reasonable controls for the process. That document is available from SAE.

Lee Gearhart
metallurgist - E. Aurora, New York

A. Heat to 1050-1100 °C and fast-cool.

Bill Reynolds [deceased]
consultant metallurgist - Ballarat, Victoria, Australia
We sadly relate the news that Bill passed away on Jan. 29, 2010.
2005

A. If you heat it, even with a torch, and or stress relieve cold formed 300 series, it will remove the magnetic properties.

Dan Magalich
- Pittsburgh, Pennsylvania, USA
March 3, 2008

"Magnetism and Magnetic Materials"

on AbeBooks

or Amazon

(affil links)

Q. How to remove magnetic properties from ss 304 screws, washers & spring washers?

huzefa sabuwala
trader - secunderabad, andhra pradesh, India
July 26, 2011

A. Hi, Huzefa.

As you see, we appended your inquiry to a thread which already answers it. You can remove true magnetism (that is, where the screws attract iron) with an electrical degausser. But you can remove ferromagnetism (that is, where a magnet attracts the screws) only through re-heating to change the crystal structure as suggested by Dan. Good luck.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
July 28, 2011

Q. I am trying to remove the magnetic attraction of cold worked 304 SS so that it is much less or not affected by a induction coil at all. Will this work as well?

Marvin Lane
- Denver Colorado
January 12, 2015

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