My understanding has always been that the proportional limit is essentially
the yield point for steel with Fy <= 65 ksi. Higher strength low alloy and
quenched and tempered steels require use of the 2% offset rule.
What is the permissible tolerance in the ASTM spec for A36 plate? It would
seem reasonable to me that as soon as you use the A36 classification you
should be confident that the product meets minimum spec. Where do you get
the 10% figure from? If you are specifying the product there should be mill
certs stating the material properties for comparison. If you are working
with existing steel and the application is that critical, can you have a
----- Original Message -----
From: "Fountain Conner" <fconner(--nospam--at)pcola.gulf.net>
Sent: Tuesday, May 15, 2001 2:36 PM
Subject: Re: Proportional Limit, A36 Plate
> Can I count on the *yield* for A36 plate being over 36ksi, or can I assume
> the proportional limit as equal to *yield*? My only reference leads me to
> suspect that the proportional limit for steel could be as much as 10
> percent below yield.
> There's a reason for this exercise -- I'm checking a stack per ASME
> STS-1-1992 (the latest according to ASME website). If the proportional
> limit is significantly less than yield, my allowable bending stress will
> lessened substantially.
> From: Charlie Carter <carter(--nospam--at)aiscmail.com>
> To: 'seaint(--nospam--at)seaint.org'
> Subject: RE: Proportional Limit, A36 Plate
> Date: Tuesday, May 15, 2001 1:51 PM
> >Does anyone have a "ready" number for the proportional limit for A36
> >from 3/16" to 1/2" thick?
> Fy for ASTM A36 steel plate is 36 ksi up to and including a thickness of
> Above 8" thickness, it is reduced to 32 ksi.
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