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Steel Deck - ASTM Standard Specifications

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Bart,

I haven't contributed anything to this list service in a while, so here
goes.  The short answer is, "Yes, use ASTM A 611 - 97, 'Standard
Specification for Structural Steel (SS), Sheet, Carbon, Cold-Rolled' only
for steel deck that is painted."  I'm not sure what you mean by, "These
specifications are definitely under different jurisdictions," but to my
knowledge all jurisdictions, and certainly all of the model building codes,
have adopted by revision the current ASTM standard specifications for steel
deck, including the major ASTM revisions of 1994.

The ASTM specifications for cold-formed steel deck were very much revised
back in 1994, including issuing new specifications for galvanizing and
galvanized sheet steel products.  According to literature dated July 1997
that I received from Verco Manufacturing Company, the new specifications
were written to streamline and simplify the specifications for the steel
producers.  IMO, a fringe benefit is that it helped structural engineers to
better understand the ASTM specifications too.  Material characteristics and
product performance were not affected by the changes in ASTM designations,
and cold-rolled (painted) material covered by ASTM A 611 was not affected by
the changes.  Following is a summary of the changes:

1)  ASTM A 446/A 446M - 93, "Standard Specification for Steel Sheet,
Zinc-Coated (Galvanized) by the Hot-Dip Process, Structural (Physical)
Quality" was discontinued in 1994 and replaced by the new ASTM A 653/A 653M
- 94, which in turn referenced the new ASTM A 924/A 924M - 94.  To my
knowledge, the current versions of these two new ASTM standards are:

   a)  ASTM A 653/A 653M - 98a, "Standard Specification for Steel Sheet,
Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the
Hot-Dip Process."

   b)  ASTM A 924/A 924M - 96a, "Standard Specification for General
Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process."

2)  Similarly, ASTM A 525 - 93 (as well as ASTM A 525M - 91a), "Standard
Specification for General Requirements for Steel Sheet, Zinc-Coated
(Galvanized) by the Hot-Dip Process" was also discontinued in 1994 and
replaced by the new ASTM A 924/A 924M - 94, which was referenced by the new
ASTM A 653/A 653M - 94.

3)  The coating designations from the discontinued ASTM A 525 (ex: G60, G90,
etc.) standard were unchanged, but are now included in the new ASTM A 653/A
653M specification.

4)  The balance of the discontinued ASTM A 525, other than the coating
designation, is now included in the new ASTM A 924/A 924M, which covers all
metallic coatings (zinc, aluminum, lead-tin) applied by the hot-dip process.

5)  Unlike the discontinued ASTM A 446/A 446M, the material grade that is
specified under the new ASTM A 653/A 653M now corresponds to the minimum
yield strength of the steel sheet in ksi (ex: SQ Grade 33 = 33 ksi minimum
yield; SQ Grade 80 = 80 ksi minimum yield).  -- [Ed: I wish the ASTM
Committee would similarly revise the material grade designations for ASTM A
611, but so far they haven't.]


The most obvious benefit of these changes to structural engineers is that
one ASTM standard (ASTM A 653/A 653M) can now be used to specify all
requirements for steel deck, where previously two ASTM standards were
previously required to specify the structural requirements (ASTM A 446/A
446M) and the coating requirements (ASTM A 525 or ASTM A 525M).  Examples of
the previous material designations and the corresponding new designations
are:

	"Previous"			"New"

	ASTM A 446, Grade A		ASTM A 653, Structural Quality (SQ)
Grade 33

	ASTM A 446, Grade E		ASTM A 653, Structural Quality (SQ)
Grade 80

	ASTM A 525, G60		ASTM A 653, G60


As with all structural materials, IMHO, all structural engineers should
obtain a copy and be familiar with these ASTM standard specifications,
rather than simply rely on manufacturers' catalogs.


James H. Stamper, PE (Jim)
Senior Structural Engineer
Heery International, Inc.
Atlanta, Georgia
(E-Mail:  jstamper(--nospam--at)heery.com)



--------------------------------------------------------------------------
From: Bart Needham <bartn(--nospam--at)ckcps.com>
Date: Thursday, December 09, 1999
To: "seaint(--nospam--at)seaint.org" <seaint(--nospam--at)seaint.org>
Subject: Formed Steel Deck


Does anyone know what the difference between A653 and A611 is for metal
deck?

Is the only difference that if A653 is specified, it is galvanized, and if
A611 is specified, it is intended to be painted?

These specifications are definitely under different jurisdictions, but is
what I have stated above the main difference?


Thanks for your help,

Bart Needham