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    Eagle H-Beam Rods

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    Join date : 2009-02-25

    Eagle H-Beam Rods

    Post  Admin on Thu Jul 09, 2009 7:49 pm

    All Eagle H-beam rods are forged from certified 4340 chromoly steel.
    While a lot of companies make rods from this material, if you pay close
    attention, you will notice not all 4340 is the same. For instance, to
    be classified as "4340 steel" certain alloying elements must be present
    in certain percentages. AISI/SAE specifications call for 1.65% to 2.00%
    nickel content. While this seems like a small diference, understand
    that this is almost an 18% variation. 4340 steel with 1.65% nickel will
    act a little differently than 4340 steel with 2.00% nickel content.
    This is just one of many alloying elements involved in creating 4340
    steel. Through extensive material testing, Eagle works closely with the
    foundry we use to achieve a much tighter tolerance of all alloying
    elements to our specific requirements. Along with this, the heat
    treatment and tempering process used is vital to producing a stong
    steel. While exactly what we do is a closely guarded secret, all of
    this attention to detail results in a stronger and much more consistent
    material. Our "4340" steel routinely tests 10-15% stronger than
    "typical" SAE/AISI spec 4340 steel.

    Another important design feature is all Eagle H-beam rods are
    manufactured from a 2 piece forging. This is significant because it
    enhances the strength of the rod cap by orienting the "grain" of the
    metal with the direction of stress. The stress exerted on the cap is
    perpendicular to the stress on the beam. Forged metal, like wood, has a
    grain "flow".

    While wood is stronger in compression and tension when the stress is
    applied along the grain, it is weaker when the stress is applied
    perpendicular to the grain. The same is true for steel. Although not as
    severely different as wood, forged steel will show the same type of
    result. It might be minor, but several "minor" enhancements combined
    together result in a major improvement. Eagle also never uses
    "cracked cap" type of manufacturing. This is a cheap alternative to try
    and produce a more perfect fit between the cap and the beam. The
    problem is that in order for this to work, the rod material must be
    brittle (that's bad), and we would have to make the rod as a single
    forging (see above). Instead of resorting to those kind of measures to
    achieve a "pefect" fit - we just machine the rod and cap perfectly. So
    much so that it is difficult to see the parting line at all!




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