Minimum chamber thickness
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  1. #1
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    Question Minimum chamber thickness

    I’ve seen old revolvers with very thin cylinder wall thickness, like these for example https://www.kirstkonverter.com/ruger...converters.gif

    Back in the days the quality of the steel was inferior, so it got me to wounder about the steels of today.

    What’s the minimum thickness of a chamber in cal .40 containing a 25-30 grain FFFG black powder (or equivalent pyrodex P) load with a 92 grain lead roundball tightly infront of it (+wadding) if it’s made of a steel with following properties:

    Yield strength min [MPa]
    700

    Tensile strength [MPa]
    900-1050

    Elongation A5 [%]
    12

    Hardness
    270-325 HB

    And how many PSI will such a load described above generate?

  2. #2
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    Calculating the pressure a tube will withstand is easy, called "hoop stress".

    hoop stress.. - Google Search

    Here are examples of black powder pressures.

    black powder pressure - Google Search

    Bill


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