ASTM A572 / A572M

This specification covers five grades of high-strength low-alloy structural steel shapes, plates, sheet piling, and bars. Grades 42 [290], 50 [345], and 55 [380] are intended for riveted, bolted, or welded structures. Grades 60 [415] and 65 [450] are intended for riveted or bolted construction of bridges, or for riveted, bolted, or welded construction in other applications.For applications, such as welded bridge construction, where notch toughness is important, notch toughness requirements are to be negotiated between the purchaser and the producer.

Chemical Properties

Diameter, Thickness Structural Shape Flange Grades Carbon, max,
%		 Manganese,B max,
%		 Phosphorus, max,
%		 Sulfur, max,
%		 Silicon
Plates to 11/2
in. [40 mm]
Thick,Shapes with Flanges 		Plates Over 11/2
in. [40 mm]
Thick,Shapes with Flanges
6 [150] all 42 [290] 0.21 1.35D 0.04 0.05 0.40 0.15-0.40
4 [100]E all 50 [345] 0.23 1.35D 0.04 0.05 0.40 0.15-0.40
2 [50]F all 55 [380] 0.25 1.35D 0.04 0.05 0.40 0.15-0.40
11/4[32]F ≤2 [50] 60 [415] 0.26 1.35D 0.04 0.05 0.40 G
>1/2-11/4[13-32] >1/4[25-50] 65 [450] 0.23 1.65 0.04 0.05 0.40 G
≤1/2[13]H ≤1H 65 [450] 0.26 1.35 0.04 0.05 0.40 G
Note B: Manganese, minimum, by heat analysis of 0.80 % (0.75 % by product analysis) shall be required for all plates over 3⁄8 in. [10 mm] in thickness; a minimum of 0.50 % (0.45 % by product analysis) shall be required for plates 3⁄8 in. [10 mm] and less in thickness, and for all other products. The manganese to carbon ratio shall not be less than 2 to 1.
Note C: Bars over 11⁄2 in. [40 mm] in diameter, thickness, or distance between parallel faces shall be made by a killed steel practice.
Note D: For each reduction of 0.01 percentage point below the specified carbon maximum, an increase of 0.06 percentage point manganese above the specified maximum is permitted, up to a maximum of 1.60 %.
Note E: Round bars up to and including 11 in. [275 mm] in diameter are permitted.
Note F: Round bars up to and including 31⁄2 in. [90 mm] in diameter are permitted.
Note G: The size and grade is not described in this specification.
Note H: An alternative chemical requirement with a maximum carbon of 0.21 % and a maximum manganese of 1.65 % is permitted

Products