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RE: A-618 Steel

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Title: RE: A-618 Steel

Yes, as Bob Shaw responded. However, here's one caveat that has nothing to do with weldability. ASTM A618 material is not generally available, except by special order. Even then, I'd check with a fabricator to make sure they can get it before specifying it.  Round and rectangular (includes square) HSS can be obtained in ASTM A500 material; grades B and C are common. Round steel pipe can also be obtained in ASTM A53 grade B material.