Vickers Hardness of Non-Tegemented SINN Case?
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Thread: Vickers Hardness of Non-Tegemented SINN Case?

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  1. #1
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    Vickers Hardness of Non-Tegemented SINN Case?

    I tried to do a search here and on the web but did not come up with an answer. I own 2 SINN watches on bracelets that are fully tegimented. I have read that a fully tegimented case/bezel/bracelet has a hardness on the Vickers scale of approx. 1200. I would like to know what the hardness according to the Vickers scale is for say a SINN U212. As I mentioned, I have not been able to fined anything on this. TIA! Kahuna

  2. #2
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    Vickers Hardness of Non-Tegemented SINN Case?

    In short, the U series submarine steel is a little harder than regular watch steel.

    Lots of info in this old quote.

    My UX is holding up well.




    Quote Originally Posted by CMSgt Bo View Post
    In a word, yes.

    In many words assembled by fellow Sinner, Majj, a couple years ago:

    The normal annealed austenitic stainless steels, 316L and 316L VM, have 150 - 190 HV on a Vickers Hardness scale. They can achieve 250 - 300 HV, when they are cold hardened (note: Ice hardened 316L & 316VM tool steels may achieve 600 – 700 HV; these are very expensive). The hardened austenitic stainless steel used in watches’ cases (316L or 316L VM) has 200 - 240 HV.

    The super annealed austenitic stainless steel 904L has circa 150 - 190 HV and the cold hardened super austenitic stainless steel 904L can achieve 250 - 300 HV (note: Ice hardened 904L tool steels may achieve 600 – 700 HV; these are very expensive). The hardened super austenitic stainless steel used in watches’ cases has 200 - 240 HV. There are no differences in hardness between 316L, 316L VM and 904L stainless steels used in watches.

    The SUG's patented special non-magnetic U-boat HY-100 high yield low-alloy Ni-Cr-Mo submarine steel for Sinn watches (contains C, Mn, P, S, Cu, Si, Ni, Cr, Mo, V and Ti and the MIL-S-16216K and MIL-S-16216 specifications set certain material composition, "weight % plus additional material if needed", requirements for it; but the exact composition of it is classified information) has 300 - 400 HV, usually around 350 HV. The U-boat steel used Sinn watches’ cases have circa 350 HV.

    Vickers hardness (HV) of steel and coatings simplified:

    CrNiMo 316L & 316L VM austenitic steels aka normal stainless steels (chromium nickel molybdenum) 150 – 190 HV

    CrNiMo 316L & 316L VM hardened austenitic steels aka hardened normal stainless steels (chromium nickel molybdenum) 250 – 300 HV

    Ø CrNiMo 316L & 316L VM watches usually have 200 – 240 HV

    NiCrMoCu 904L super austenitic steel aka super stainless steel (nickel chromium molybdenum copper) 150 – 190 HV

    NiCrMoCu 904L hardened super austenitic steel aka super stainless steel (nickel chromium molybdenum copper) 250 – 300 HV

    Ø NiCrMoCu 904L used in Rolex watches usually have 200 – 240 HV

    CrMoN ice hardened martensitic steel aka ice hardened, e.g. 440A stainless steel, (chromium molybdenum nitrogen) 600 – 700 HV

    CrNiMo 316L/316L VM & NiCrMoCu 904L steels Tegimented/Kolsterized 1,000 – 1,200 HV

    Ni-Cr-Mo HY-100 steel - (submarine steel contains contains C, Mn, P, S, Cu, Si, Ni, Cr, Mo, V and Ti) has 300 - 400 HV

    Ø Ni-Cr-Mo HY-100 steel used in Sinn watches usually have circa 350 HV

    HY-100 steel - Tegimented/Kolsterized (submarine steel contains C, Mn, P, S, Cu, Si, Ni, Cr, Mo, V and Ti) 1,500 HV

    HY-100 steel PVD hardened & Tegimented/Kolsterized (submarine steel contains C, Mn, P, S, Cu, Si, Ni, Cr, Mo, V and Ti) 2,000 HV

    I hope this helped.



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    Re: Vickers Hardness of Non-Tegemented SINN Case?

    Thanks for the info nodnar.

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    Re: Vickers Hardness of Non-Tegemented SINN Case?

    Thanks for making the info avalible again, dose anyone know we’re the Damasko ice hardened cases fit on the hardness scale is it the 600 - 700 mentioned.

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    Re: Vickers Hardness of Non-Tegemented SINN Case?

    Quote Originally Posted by robmellor View Post
    Thanks for making the info avalible again, dose anyone know we’re the Damasko ice hardened cases fit on the hardness scale is it the 600 - 700 mentioned.
    It's around three times the hardness of 316L stainless steel.
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    Re: Vickers Hardness of Non-Tegemented SINN Case?

    Quote Originally Posted by robmellor View Post
    Thanks for making the info avalible again, dose anyone know we’re the Damasko ice hardened cases fit on the hardness scale is it the 600 - 700 mentioned.
    It’s worth mentioning that the Damasko hardness is through and through, whereas the Sinn tegimenting, although harder, is a surface hardening. There’s advantages to both. Denting vs scratching, for example.


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