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    Re: SF Bay Bridge
    From: Brad Morris
    Date: 2013 Apr 5, 14:39 -0400

    I agree Orjan.  I required a pin made of steel such that Young's Modulus was very much beyond that of normal stainless for a critical application, involving human safety.  The vendor was completely unwilling to guarantee the values unless the vendor itself cut the pins to length.  Note that these had no threads or other features.  It was merely a cylindrical piece of steel with a radius and length.  These pins were then randomly sampled and submitted to an accredited lab for independent testing.   By the way, we had our own full machine shop who might have been able to cut the pins to length, but in doing so we had no guarantee on the modulus.

    See if you can guess what I did!!!

    Brad

    On Apr 5, 2013 2:08 PM, "Örjan Sandström" <pokerbacken---.com> wrote:

    no idea, not impossible, high tensile steels are, Uhm, less than ideal to work with.
    How hard? I find it hard to express exactly how difficult they can be to work without resorting to quite harsh language, let us just say they require attention and good tools/machines.
    I have worked steel that required the edge to be near perfectly sharpened, a tiny imperfection that would not have mattered machining even 316 stainless or hardened truck springs would make a MESS of this stuff (looked dull and uneven almost like packed silvery sand)
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