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ASTM A572 Gr42/50 steel
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ASTM A572 Gr42/50 steel

ASTM A572 Gr42/50 steel

ASTM A572 standard 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 A572 Gr42/50 steel applications, such as welded bridge construction,where notch toughness is important, notch toughness requirements are to be negotiated between the purchaser and the producer.

ASTM A572 Gr42/50 material chemical composition

Grade C max,% Mn max,% P max,% S max,% Si
Plate to 11/2 in.[40mm]thick,shapes with flange or leg thick to 3in[75mm]inclusive sheet piling,bars,zees,and rolled tees Plates over 11/2 in.[40mm]thick,and shapes with flange thickness over 3in[75mm]
Max,% Range,%
42[290] 0.21 1.35 0.04 0.05 0.40 0.15-0.40
50[345] 0.23 1.35 0.04 0.05 0.40 0.15-0.40

ASTM A572 Gr42/50 high strength steel mechanical properties

Grade Yield point,min Tensile strength,min Min elongation,%
Ksi [mpa] ksi [mpa] In 8 in[200 mm] In 2 in[50mm]
42[290] 42 [290] 60 [415] 20 24
50[345] 50 [345] 65 [450] 18 21

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