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Re: Use Of ASTM A513 For Stairs' Guardrails

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>Previously, I always used
>material conforming to ASTM A53 or A500 for guardrail designs. 

You might want to make certain the tubing you got comes with mechanical 
properties specified and not just chemistry. That isn't always the case 
with mechanical tubing. It matters only as a QA issue with regard to 
weldability and minimum strength. 

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)