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What does "s" of ASTM A709 Grade 50s steel stand for?

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SophiaSS

Materials
Feb 2, 2010
1
CA
I know "w" of ASTM A709 Grade 50w steel stands for weathering.
But I failed to find what "s" of ASTM A709 Grade 50s steel stands for.
 
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"Structural". It is the same (modulo CVN toughness requirements) as ASTM A 992, "Structural Steel Shapes".

I also like to think "Seismic". It has a cap on yield strength and on yield/tensile ratio so you can rely on it for "strong column weak beam" design.

Hg

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