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[SEAOC] Steel yield for design: ASTM specified vs. mill cert

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I've heard that the Canadian Standards Association Standard CAN3-S16.1,
Steel Structures for Buildings specifically prohibits designers from using
yield test results for design or, presumably, for checking existing
structures.  That is, the "specified minimum yield strength" (such as that
from the appropriate ASTM or equivalent standard) must be used, regardless
of actual material yield.

Also, AISC defines Fy as the "Specified minimum yield stress of the type of
steel being used,"  which seems to imply what the Canadians have explicitly

I'd appreciate your comments on the use of actual material yield test
results, from either mill certs or an appropriately designed sampling program.

David Evans, P.E.