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RE: Rebar fy - Intermediate Grade Steel

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There is an Engineering Data Report Number 48 by CRSI, “Evaluation of Reinforcing Bars in Old Concrete Structures” that has Table 1 – Reinforcing Bars 1911 to Present; ASTM Specifications; Minimum Yield Strengths in psi.  It indicates A15 start 1911 and end 1966.  Grade 40 (intermediate) with a minimum yield strength of 40,000 psi and minimum tensile strength of 70,000 psi.


Gary Loomis


-----Original Message-----
From: Juan Carlos Morales [mailto:jcmorales1564(--nospam--at)]
Sent: Thursday, February 09, 2006 5:23 PM
To: seaint(--nospam--at)
Subject: Rebar fy - Intermediate Grade Steel


I am analyzing a reinforced concrete structure designed and built in 1960-1962.  The only reference I have found in the drawings regarding the grade of steel reinforcement is a note indicating “intermediate grade steel”.  I need fy, the yield strength, for the analysis.


I have done some research in the internet and the current applicable standard for typical steel reinforcement, ASTM A615, was established in 1968.  It replaced ASTM A15 which was withdrawn in 1969.  As far as I have researched, ASTM A15 includes grades “structural, intermediate and hard”.  This seems like a good-enough lead to purchase it.  But before I make the investment, is anyone familiar with ASTM A15?  Are the “structural, intermediate, and hard” grades accompanied by an fy.




Juan C. Morales, P.E.

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