Using a magnet is not a proper inspection technique to check metals.
 
Most "non magnetic grades" of SS will at some point show attraction to a magnet depends upon the strength of the magnet, purity of the metal and the type of SS. Very few metals are 100% pure and most don't have to be. I have seen Certified 303 strongly attracted and to a lesser extent 304 and 316 material lightly attracted to magnets.
 
If you have material certification that should be enough, if not send a sample of the material to a metal lab.  If your customer is rejecting the material due to the fact it is attracted to a magnet make the deal with them that if the material fails you pay if it passes they pay if it does not.  Or you will pay this time and if it passes they will not reject any other orders for the same thing. 
 
The cost is somewhere around $45-$90 dollars for a test lab report.  If the material does fail you have recourse against your supplier.  I would not buy from this supplier again if it does fail, you should report them.
 
Tom
 
In a message dated 10/28/2003 11:14:45 AM Pacific Standard Time, [EMAIL PROTECTED] writes:
I don't believe 300 series Stainless can be magnetic, I do believe 400 series can contain some magnetism
 
HTH
Jon
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of gary
Sent: Tuesday, October 28, 2003 11:53 AM
To: SmartCAM List Server
Subject: [mfg-smartcam] of topic

I have a non SmartCam question.
 
Is anyone aware of magnetic 316 Stainless steel or a machining process that can introduces magnetism in to 316 SS. This is the second time this is happening to me and I am having a difficult time with my customer excepting magnetic stainless steel parts.
 
Regards,
Gary

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