From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
Date: Mon, 5 Jun 2000 10:36:24 -0400
ASTM A 305 is the specification for deformations on reinforcing, not yield
strength. Before ASTM A 615, the specification for rebar consisted of two
requirements: generally ASTM A 15 for strength and property requirements
(structural, intermediate or hard grade) which was for plain *or* deformed
bars, and ASTM A 305, which was for deformations.
ASTM A 15-54T (Tentative) requirements for deformed bars are as follows:
Tensile Strength: 55 - 75 ksi
Yield point (min): 33 ksi
Elongation: 1,200,000/(tens. str) but >= 16%
Tensile Strength: 70 -90 ksi
Yield point (min): 40 ksi
Elongation: 1,100,000/(tens. str) but >= 12%
Tensile Strength: 80 ksi (min.)
Yield point (min) 50 ksi
Elongation: 1,000,000/(tens. str)
Elongation is in 8" gage length and is minimum.
ASTM A 15 was issued in 1950, revised in 1952, and June and October, 1954.
Prior to being published as a "Tentative," the specifications were issued as
a standard from 1911-1950, being revised in 1912, 1913, 1914, 1930, 1933,
1935, 1939, and 1950.
Hope this helps.
A. Roger Turk, P.E.(Structural)
Scott Maxwell wrote:
>>Is anyone familiar with ASTM 305 for reinforcing steel? I am looking at a
building built around 1957 that specifies ASTM 305 for the rebar. Would
this have a yield strength of 40 ksi, or something else?<<