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Magnetic 303 stainless


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We're running some parts out of 303SS that are used for electrical proximity switches. It has a 10D bore, and then gets threaded on the outside, turned from over 2" to 5/8" of an inch.

 

The problem we're running into is that the steel is gaining some magnetism throughout the process. The customer has very specifically stated that these parts must not be magnetic and even supplied us with some rare-earth magnets to do in-process inspection.

 

Have you guys ever had to deal with this problem before, and if so, can you offer any tips or suggestions for minimizing it?

 

Do you know of any proprietary grade 303 that is less prone to being magnetized?

 

We sent some sample parts out for "de-magnetization" to a local heat-treat shop and it didn't fully cure the problem.

 

Any help is appreciated.

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We have one and it doesn't work very well.

 

The magnets they gave us to test are insanely strong. Did you know that granite blocks are magnetic? We didn't either until a magnet stuck to the side of one. In retrospect it makes perfect sense, but I never even thought about it because I've never seen it happen before.

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That would be stainsless steel. :yes: :D

 

When I worked for Cummins, we magnafluxed 100% of the engine blocks. We had to de-mag them. I just remember that anybody with a pacemeaker wasn't allowed to work in that area of the building. It was a pretty powerful machine. Big 'ol battery cables got attached and it took a few minutes. I wish I could remember the name of the machine... Sorry.

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From these folks: http://www.azom.com/article.aspx?ArticleID=1140 

Sounds like stress relieving "Should work".

Degaussing would be the other option. http://en.wikipedia.org/wiki/Degaussing

 

Cold-Working

Most of the polished and cold-worked steel bar products, such as grades 303 and 304, will have a considerable quantity of magnetism gained through cold-working. However, grades 310 and 316, having high nickel content, tend to have much less magnetism. The rate of stimulation of magnetic response due to cold-working can be altered with respect to the chemical control of single standard analysis range.

 

 

Stress Relieving

Stress relieving of any austenitic stainless steel can reverse the magnetic response generated from cold-working. This conversion of magnetic steels to a non-magnetic condition can be performed by heating them to temperatures of about 700 to 800°C using an oxy-acetylene torch. However, the steels may become sensitive to carbide precipitation if they are not stabilized.

 

 

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From these folks: http://www.azom.com/article.aspx?ArticleID=1140 

Sounds like stress relieving "Should work".

Degaussing would be the other option. http://en.wikipedia.org/wiki/Degaussing

 

Cold-Working

Most of the polished and cold-worked steel bar products, such as grades 303 and 304, will have a considerable quantity of magnetism gained through cold-working. However, grades 310 and 316, having high nickel content, tend to have much less magnetism. The rate of stimulation of magnetic response due to cold-working can be altered with respect to the chemical control of single standard analysis range.

 

 

Stress Relieving

Stress relieving of any austenitic stainless steel can reverse the magnetic response generated from cold-working. This conversion of magnetic steels to a non-magnetic condition can be performed by heating them to temperatures of about 700 to 800°C using an oxy-acetylene torch. However, the steels may become sensitive to carbide precipitation if they are not stabilized.

 

We tried the stress-relieving before and it didn't work fully. We sent it out to a heat-treating facility. 

 

To be honest I'm not even sure why they chose 303 considering the industry it is being made for; everything else we make is 316 or much more exotic (Inconel, Monel, etc)

 

Thanks for the help, everyone.

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