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Re: [PSUBS-MAILIST] rib span
In brief. The "A" in A-516Gr 70 means that this
particular material has been tested by the American Society for Testing and
Materials (ASTM) and has been approved to be used for applications requiring a
specific characteristic or property. This gives material manufacturers, the
steel mills, a standard (chemically, mechanically, ect..) which must be
met in order to provide the consumer/fabricator a material that is
trustworthy. The "516" is a numbering system that in this particular case
specifies the material as being a carbon steel suitable for pressure vessels
subjected to moderate and lower temperature service.The nominal
composition for this is C-Mn-Si which together give the material its
ability to be used for applications such as submarines. Grade 70 means that
the plate has a minimum specified tensile strength of 70 ksi (70-90,000 psi is
the actual range) the highest for this particular alloy. The others are 55, 60,
and 65 ksi depending on the heat treatment process, I think.
The American Society of Mechanical Engineers (ASME)
has adopted this same numbering system except to show they didn't copy it
directly they add an "A" to the beginning. So if you look this material up
because you want to weld on it and you need to find filler materials or
qualify the material, weld and/ or welder you would find this under
SA-516Gr70 and a lettering system that helps you through the ASME
standards. These materials come in different forms like plate and
sheet. Sheet just being very thin <0.125 in. and sometimes it
comes in coils. These forms are partially dictated by the demand and the
physical ability to produce the material with the desired
properties.
Adam
----- Original Message -----
Sent: Thursday, August 21, 2003 6:15
PM
Subject: Re: [PSUBS-MAILIST] rib
span
If no one minds me chiming in, I've a question.
"A516Gr70". Obviously this is nomenclature referring to the grade and
type of steel used, but I myself am foggy on it. What is the difference
between plate and sheet steel, and how is the above term "deciphered" into
layman's terms? Could someone break that down for me?
Thanks,
Chris Nugent
VBra676539@aol.com wrote:
K-350
1-man has 48" long cylinder, 2-man has 72"--the 600 is 72" in the 1-man
version just to float. Built like an anvil. The PC-8 is a 42" diameter
hull,
3/8" A516Gr70 and rated at 800', so I'd say Captain Kittredge was
being very
conservative. So would he.
Vance
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