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.Specification A588/A588M shall not be substituted for Specification A572/A572M without agreement between the purchaser and the supplier.

Chemical Properties

Grade	Carbon	Manganese	Phosphorus	Sulfur	Silicon
42 [290]	0.21	1.35D	0.04 max	0.05 max	0.40
50 [345]	0.23	1.35D	0.04 max	0.05 max	0.40
55 [380]	0.25	1.35D	0.04 max	0.05 max	0.40
60 [415]	0.26	1.35D	0.04 max	0.05 max	0.40
65 [450]	0.23	1.65	0.04 max	0.05 max	0.40
65 [450]	0.26	1.35	0.04 max	0.05 max	0.40

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 %.

Mechanical Properties

Grade	Tensile Strength, min, ksi [MPa]	Yield Strength (0.2 % Offset), min, ksi [MPa]	Minimum Elongation, %
			in 8 in. [200 mm]	in 2 in. [50 mm]
42 [290]	42 [290]	60 [415]	20	24
50 [345]	50 [345]	65 [450]	18	21
55 [380]	55 [380]	70 [485]	17	20
60 [415]	60 [415]	75 [520]	16	18
65 [450]	65 [450]	80 [550]	15	17