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  1. #1
    JKR1300's Avatar
    Join Date
    Jan 2006
    St Louis & 6mm LotO

    SS Grate Magnetic

    My shop-magnet is highly attacted to the new intake grate. I thought stainless was non-magnetic? The SS bolts I had already purchased are non-magnet.
    Can someone expain?

  2. #2
    r33pwrd's Avatar
    Join Date
    Mar 2006
    Sammamish Washington
    the answer is that it depends. There are several families of stainless steels with different physical properties. A basic stainless steel has a 'ferritic' structure and is magnetic. These are formed from the addition of chromium and can be hardened through the addition of carbon (making them 'martensitic') and are often used in cutlery. However, the most common stainless steels are 'austenitic' - these have a higher chromium content and nickel is also added. It is the nickel which modifies the physical structure of the steel and makes it non-magnetic.

    So the answer is yes, the magnetic properties of stainless steel are very dependent on the elements added into the alloy, and specifically the addition of nickel can change the structure from magnetic to non-magnetic.

  3. #3
    Join Date
    Oct 2006
    316 is not magnetic....

    316 is marine grade.

  4. #4
    Moderator OsideBill's Avatar
    Join Date
    Mar 2006
    United States
    From Jerry's post in the grate thread he said it was 15-5 SST which is a martensitic grade.
    Attached Files Attached Files

  5. #5
    Many driveshafts are also made with PH 15-5 and 17-4 which are also magnetic. Percipitation Hardness. These materials can reach over 200ksi in ultimate tensile strength and yield strength in the H900 heat treat condition.

    Pound for pound not too many materials are stronger that would be suitable for applications like this and they have excellent corrosion resistance

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