Page 6 - Structural Steel Designers Handbook AISC, AASHTO, AISI, ASTM, and ASCE-07 Design Standards

Brockenbrough_Ch01.qxd 9/29/05 4:59 PM Page 1.4

PROPERTIES OF STRUCTURAL STEELS AND EFFECTS OF STEELMAKING AND FABRICATION

1.4 CHAPTER ONE

TABLE 1.1 Specified Minimum Properties for Structural Steel Shapes and Plates* (Continued)

Elongation, %
Structural shape Yield Tensile
ASTM Plate thickness flange or leg stress, strength, In 2 In
designation range, in thickness range, in ksi † ksi † in ‡ 8 in
Heat-treated constructional alloy steels
1
A514 2 / 2 maximum ¶ 100 110–130 18 —
1
Over 2 / 2 to 6 max ¶ 90 100–130 16 —
*The following are approximate values for all the steels:
3
Modulus of elasticity—29 × 10 ksi.
3
Shear modulus—11 × 10 ksi.
Poisson’s ratio—0.30.
Yield stress in shear—0.57 times yield stress in tension.
Ultimate strength in shear— / 3 to / 4 times tensile strength.
3
2
−6
Coefficient of thermal expansion—6.5 × 10 in per in per °F for temperature range −50 to +150°F.
Density—490 lb/ft . 3
†
Where two values are shown for yield stress or tensile strength, the first is minimum and the second is maximum.
‡
The minimum elongation values are modified for some thicknesses in accordance with the specification for the steel. Where
two values are shown for the elongation in 2 in, the first is for plates and the second for shapes.
¶ Not applicable.
steel producers to obtain the specified properties. This steel provides about four times the resistance
to atmospheric corrosion of structural carbon steels.
These relative corrosion ratings are determined from the slopes of corrosion-time curves and are
based on carbon steels not containing copper. (The resistance of carbon steel to atmospheric corro-
sion can be doubled by specifying a minimum copper content of 0.20%.) Typical corrosion curves
for several steels exposed to industrial atmosphere are shown in Fig. 1.2.

FIGURE 1.2 Corrosion curves for structural steels in an industrial atmosphere. (From R. L. Brockenbrough
and B. G. Johnston, USS Steel Design Manual, R. L. Brockenbrough & Associates, Inc., Pittsburgh, Pa., with
permission.)

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