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Thread: Bronze or Silicone Bronze

  1. #1
    Join Date
    Mar 2021
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    Northville, MI, USA
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    Default Bronze or Silicone Bronze

    I'm adding side braces inside the sides of my cabin like in the pictures.

    My question is regarding one of strength and corrosion. Fresh water sailing only for the foreseeable future.

    Is it overkill to go with silicone bronze over standard bronze? Any suggestions on the bronze alloy?
    5587150L.jpg5587185L.jpg
    I was thinking 1/8 think bar.

    Thanks, Kirt

  2. #2
    Join Date
    Mar 2011
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    Mukilteo, WA
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    3,437

    Default Re: Bronze or Silicone Bronze

    There is no standard bronze, silicon bronze is one of many bronze groups. For this application any of them would work, I would use silicon bronze or aluminum bronze depending on availability.

    Are you sure these braces are needed? 1/8" will add strength, but only in tension. Do you have shroud loads or other loads you are trying to resolve this way?

  3. #3
    Join Date
    Sep 2015
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    Viroqua, Wisconsin
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    478

    Default Re: Bronze or Silicone Bronze

    Lotsa different bronze alloys.

    I’d think if fresh water only, cost & availability would be your first filters. The info at that link may tell you more about where specific alloys are best used.

  4. #4
    Join Date
    Jun 2000
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    Pleasant Valley NS Canada
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    23,661

    Default Re: Bronze or Silicone Bronze

    There are lots of different types of bronze out there. Common ones used in a marine environment are silicon-bronze, aluminum-bronze, manganese-bronze, and copper-nickle-bronze (usually called cupronickle). In the application that you show, you are looking for tensile strength mostly, with a wee bit of elasticity. Any of these bronze alloys will do, as the stresses in your cabin trunk will not be all that great. It will come down to mostly, what colour of bronze do you like, and how much does it cost? There will also be varying degrees of availability in the size of bar that you want. In descending order, the alloys with greatest tensile strength are:

    cupronickle - 128000 psi
    manganese bronze - 119000 psi
    aluminum bronze - 85000 psi
    silicon bronze - 60000 psi.
    Hope for the best, but plan for the worst.

  5. #5
    Join Date
    Mar 2021
    Location
    Northville, MI, USA
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    Thumbs up Re: Bronze or Silicone Bronze

    Quote Originally Posted by mmd View Post
    There are lots of different types of bronze out there. Common ones used in a marine environment are silicon-bronze, aluminum-bronze, manganese-bronze, and copper-nickle-bronze (usually called cupronickle). In the application that you show, you are looking for tensile strength mostly, with a wee bit of elasticity. Any of these bronze alloys will do, as the stresses in your cabin trunk will not be all that great. It will come down to mostly, what colour of bronze do you like, and how much does it cost? There will also be varying degrees of availability in the size of bar that you want. In descending order, the alloys with greatest tensile strength are:

    cupronickle - 128000 psi
    manganese bronze - 119000 psi
    aluminum bronze - 85000 psi
    silicon bronze - 60000 psi.

    Thanks for the education on the various types.

    I'll start with the local metal suppliers and see what they have in flat bars.

    Thanks Again!

  6. #6
    Join Date
    May 2016
    Location
    Ottawa, Canada
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    486

    Default Re: Bronze or Silicone Bronze

    It's unlikely your local suppliers will stock flat bar bronze. I found it's usually sheared from plate. I've ordered from both Atlas and national bronze.
    Cheers,
    Mark

    https://atlasmetal.com/

    https://www.nationalbronze.com/

    https://www.farmerscopper.com/

  7. #7
    Join Date
    Jun 2003
    Location
    Central Coast, Ca
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    30,966

    Default Re: Bronze or Silicone Bronze

    For fresh water brass would be just fine

  8. #8
    Join Date
    Oct 2008
    Location
    Walney, near Cumbria UK
    Posts
    53,233

    Default Re: Bronze or Silicone Bronze

    Quote Originally Posted by MonAutreAmour1 View Post
    I'm adding side braces inside the sides of my cabin like in the pictures.

    My question is regarding one of strength and corrosion. Fresh water sailing only for the foreseeable future.

    Is it overkill to go with silicone bronze over standard bronze? Any suggestions on the bronze alloy?
    5587150L.jpg5587185L.jpg
    I was thinking 1/8 think bar.

    Thanks, Kirt
    What are you expecting those braces to do?

    I initially thought that you were referring to hanging knees stiffening the cabin side deckhouse roof joint. Is that what you really mean?
    It really is quite difficult to build an ugly wooden boat.

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