What is "Submarine Steel"?

Thread: What is "Submarine Steel"?

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  1. #1
    Member jason_recliner's Avatar
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    Question What is "Submarine Steel"?

    Hi everybody! Can any of you Sinn devotees tell me the grade of alloy used to make this 'submarine steel' cases? Thanks!

    Toby
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  2. #2
    Member Andy S.'s Avatar
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    Re: What is "Submarine Steel"?

    I believe it is related to 'Monel' a predominantly Ni/Cu/Fe alloy noted for high strength while maintaining corrosion resistance & non-mag properties. It's ideal for marine and naval hull applications, it's also used extensively in downhole drilling tools used in oil/gas well drilling. I don't know that it's extensively hard compared to other alloys, i believe it may be one of the softer alloys as far as surface hardness goes...hence Sinn's 'tegiment' process which increases surface hardness a great deal. It is also very difficult to machine.
    Last edited by Andy S.; March 19th, 2009 at 02:30.

  3. #3
    Member jason_recliner's Avatar
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    Re: What is "Submarine Steel"?

    Are you sure? Monel is a nickel alloy, not a steel. I tought that Sinns (and submarines) were made froma steel alloy. I could be wrong though. I'm no expert, hence my question!
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  4. #4
    Member Andy S.'s Avatar
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    Re: What is "Submarine Steel"?

    Steel is a predominantly ferrous alloy........in my mind, as a given, you want a submarine hull to be made out of a very strong alloy, but, non-magnetic & highly corrosion resistant. That would have to be a predominantly non-ferrous alloy. Monel is one example...i'm not saying that's what it is...but that is my best guess & it has a known presence in marine engineering.

  5. #5
    Member roberev's Avatar
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    Re: What is "Submarine Steel"?

    I don't know anything useful to contribute to the alloy discussion, but the steel used in the Sinn U-series is nickel-free according to Sinn.

    Rob

  6. #6
    Member jason_recliner's Avatar
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    Re: What is "Submarine Steel"?

    WOAH!!! You just blew my mind. Nickel free marine steel? Well I'll be a monkey's uncle!
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  7. #7
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    Re: What is "Submarine Steel"?

    Here...

    Steel for the production of submarine hulls, which is characterized in that the chemical composition thereof comprises, by weight percent: 0.03%≦C<0.08%; 0.04%≦Si≦0.48%; 0.1%≦Mn≦1.4%; 2%≦Ni≦4%; Cr≦0.3%; 0.3%≦Mo+W/2+3(V+Nb/2+Ta/4)≦0.89%; Mo≧0.15%; V+Nb/2+Ta/4≦0.004%; Nb≦0.004%; Cu≦0.45%; Al≦0.1%; Ti≦0.04%; N≦0.03%; the remainder comprising iron and impurities resulting from production, boron being an impurity with a concentration of less than 0.0005% and P+S≦0.015%, the chemical composition satisfying condition 410≦540◊C0.25+245[Mo+W/2+3(V+Nb/2+Ta/4)]0.30.ltore- q.460. The inventive steel has an essentially martensitic or lower bainitic structure comprising at least 90% martensite or lower bainite, at most 5% residual austenite, at most 5% ferrite. The steel has a yield strength of between 480 MPa and 620 Mpa and a Charpy toughness V, KCV at -60į C. of more than 50 J.
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  8. #8
    Member jason_recliner's Avatar
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    Re: What is "Submarine Steel"?

    Awesome work mate. I see you've built a few subs in your time.
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  9. #9
    Member polishammer's Avatar
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    Re: What is "Submarine Steel"?

    In short the sub steel is an alloyed steel with manganese and molybdenum as a key components. This gives the steel good anti magnetic and corrosion resistant properties. In addition, manganese gives this type of steel possibility to be tangimented thus increasing its hardness

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  10. #10
    Member jason_recliner's Avatar
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    Re: What is "Submarine Steel"?

    Like that needed further explanation! The meaning of your original post was perfectly clear to anybody with an advanced degree in metallurgical chemistry!!!
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