Why is my 316 watch case is attracted to magnet?
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Thread: Why is my 316 watch case is attracted to magnet?

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  1. #1
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    Why is my 316 watch case is attracted to magnet?

    Not strong..but I thought it should be completely non magnetic?


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  2. #2
    Member Medusa's Avatar
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    Re: Why is my 316 watch case is attracted to magnet?

    316 grade stainless still has ferrous iron in it. That's why its magnetic and will still rust in some conditions.

  3. #3
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    Re: Why is my 316 watch case is attracted to magnet?

    Hope your not testing a completed watch (case) with a magnet as it can cause the movement to be magnetized and run fast.

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  5. #4
    Member MissileExpert's Avatar
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    Re: Why is my 316 watch case is attracted to magnet?

    316 SS is paramagnetic - it has weak magnetic properties. All steels have iron, but if the crystal structure of the iron is ferrite, it'll be magnetic. Mostly of 316 has an austenite crystal structure, which is non-magnetic. If the case was cast instead of machined, it will contain enough ferrite to be slightly magnetic. The cast version of the same alloy should be designated as CF8M, though. Could be the movement in your watch that is causing the magnet to stick to the case. I'd be worried and would consider getting it degaussed.
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  6. #5
    Member sticky's Avatar
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    Re: Why is my 316 watch case is attracted to magnet?

    Quote Originally Posted by MissileExpert View Post
    316 SS is paramagnetic - it has weak magnetic properties. All steels have iron, but if the crystal structure of the iron is ferrite, it'll be magnetic. Mostly of 316 has an austenite crystal structure, which is non-magnetic. If the case was cast instead of machined, it will contain enough ferrite to be slightly magnetic. The cast version of the same alloy should be designated as CF8M, though. Could be the movement in your watch that is causing the magnet to stick to the case. I'd be worried and would consider getting it degaussed.
    And I was just going to say how 316L had some iron in it.
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  7. #6
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    Re: Why is my 316 watch case is attracted to magnet?

    It isn't just iron; there are plenty of steel alloys that are basically non-magnetic. Cooking aficionados are often intimately familiar with this...because pans made from these, cannot be used on an induction burner. Those require a magnetic material.

    My thought is, it's not just the case that matters. The movement itself may be the attractant...which is why it can get magnetized in the first place.
    The truth is rarely pure and never simple.

    Oscar Wilde, The Importance of Being Earnest

  8. #7
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    Re: Why is my 316 watch case is attracted to magnet?

    That's the attraction.

  9. #8
    Member rfortson's Avatar
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    Re: Why is my 316 watch case is attracted to magnet?

    Quote Originally Posted by Metallman View Post
    Hope your not testing a completed watch (case) with a magnet as it can cause the movement to be magnetized and run fast.
    LOL, yeah! OP's next thread will be "Why is my watch suddenly 5 minutes fast per hour?"

    :)
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