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aluminum design

aluminum design

aluminum design

I am useing allowable stress design with the aluminum design manual.  The aluminum I am useing is 6063 T5.  
     I am looking at the bending of a rectangular tube.  table 2-22 shows that the lower slenderness limit is 204.
  My question is how do they arrive at this #?  I have looked at section 3.4.14 and determined the buckling constants Bc and Dc.  I then used eq 3.4.14-4 to find S1...needless to say it is not 204.  I used Fcy=16ksi and E=10100.  If anyone can help me with this it would be greatly appreciated.

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