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ASTM A513 Tubing

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A contractor is requesting a substitution of ASTM A513 for ASTM A500-GrB
structural steel tubing.  Does anyone have any information on the use of
A513 for structural purposes and whether there are any welding and
ductility issues to look out for.  The mill cert. states that fy=86.5ksi
and fu=97.3ksi and lists the steel as A513-97 T5.  The tube in question
is 7" diameter 1/2" sidewall with a proposed full pen. weld splice at
2/3H.  The design is driven by deflection criteria not stresses.

Thanks

Nicholas Blackburn, PE
nblackburn(--nospam--at)ipd-oak.com