] [Thread] [Date] [Author]

[Harold Sprague <harold.sprague(--nospam--at)neenan.com>]

John,

Robert Robert Kazanjy asked me the same question.  

The reason I avoid the AISI grades is that the mechanical properties vary
with the manufacturer.  If you order 1018 steel from Ryerson it is different
if it comes from Edgecomb.  The chemistry is the same, but I often need to
be concerned about the mechanical properties as well as the chemistry.  You
have addressed the problem by specifying the ASTM F593.  As long as you have
a specification for the mechanical properties as well as the chemistry, I am
OK with AISI.

One of my favorite specs for anchorages is the ASTM A193 series which
includes many alloys of various chemistries and physical properties.  B7 is
only one of the types within A193.  The ASTM A193 B8 series has 8.00 to
10.50 nickel with yield strengths as great as 100 ksi and very good
elongations if ductility is a concern.  I also have used F593 and A276 SS
bolts.

Special-T Metals uses a lot of A193 materials in their SS bolt line, and was
the first company to introduce me to the virtues of A193.

Harold Sprague
The Neenan Company


-----Original Message-----
From: Silva John (sj) [mailto:Silva(--nospam--at)hilti.com]
Sent: Thursday, September 30, 1999 5:11 PM
To: 'seaint(--nospam--at)seaint.org'
Subject: RE: Threaded Stainless Steel Rod


Harold,

I picked this response up while cleaning out my inbox.  Is there a
particular reason why you avoid the AISI grades?  Our typical offering for
threaded rod in the U.S. is 304 or 316 meeting the mechanical requirements
of ASTM F593 Condition CW.  Based on our experience, the chemical
composition of 316 is preferred for resisting chloride and sulfur dioxide
attack in the form of pitting and crevice corrosion.
You might be interested to know that we also have a high molybdenum content
(> 6%) stainless available on request with a DIN material number of 1.4529.
We designate this material HCR.  It has been tested extensively in Swiss
tunnels over a two year period side by side with more garden variety
stainless materials and is the only anchor material permitted in Swiss
tunnel construction.  Other stainless formulations, including A4 (similar to
316), failed this trial.

Regards,


John F. Silva, SE
Director, Codes and Approvals
Hilti, Inc.
(415) 507 1690   fax (415) 507 1695
silva(--nospam--at)hilti.com

  
> ----------
> From: 	Harold Sprague[SMTP:harold.sprague(--nospam--at)neenan.com]
> Reply To: 	seaint(--nospam--at)seaint.org
> Sent: 	Wednesday, September 29, 1999 7:44 AM
> To: 	'seaint(--nospam--at)seaint.org'
> Subject: 	RE: Threaded Stainless Steel Rod
> 
> Charlie,
> 
> There are many ASTM listings for stainless steel rod.  I would first see
> what is commonly available in Grainger http://www.grainger.com/ and in
> McMaster Carr http://www.mcmaster.com/.
> 
> I prefer the family of ASTM A193 steels, which includes many types of
> stainless steels.  Pick the strength and the performance that you require.
> I generally avoid the AISI grades unless strength is not a big issue.  The
> AISI grades are more common.
> 
> Regards,
> Harold Sprague
> The Neenan Company
> 
> 
> -----Original Message-----
> From: CanitzCF(--nospam--at)aol.com [mailto:CanitzCF(--nospam--at)aol.com]
> Sent: Tuesday, September 28, 1999 10:25 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Threaded Stainless Steel Rod
> 
> 
> Is anyone aware of the ASTM reference for threaded stainless steel rod?
> 
> TIA,
> Charlie Canitz
>