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A572 steel has five different grades: 42, 50, 55, 60 and 65. [2] ... A572 Steel Material Properties, Per ASTM Standards [2] A572 Grade Yield Point (KSI) [MPa]
ASTM A992 is currently the most available steel type for structural wide-flange beams. The industry's technical institute describes the standard thus: "ASTM A992 (Fy = 50 ksi, Fu = 65 ksi) is the preferred material specification for wide-flange shapes, having replaced ASTM A36 and A572 grade 50.
Continuous cooling transformation diagram of EN S355 (ASTM A-572 Grade 50, warranted yield stress 355 MPa) for welding (fast cooling, linear scale). A continuous cooling transformation (CCT) phase diagram is often used when heat treating steel. [1]
A529 Gr. 50 50 70-100 1.40 21 Hot-rolled carbon steel sheets and strips of structural quality A570 Gr. 30 30 49 1.63 21 Gr. 33 33 52 1.58 18 Gr. 36 36 53 1.47 17 Gr. 40 40 55 1.38 15 Gr. 45 45 60 1.33 13 Gr. 50 50 65 1.30 11 High-strength low-alloy columbium– vanadium steels of structural quality A572 Gr. 42 42 60 1.43 24 Gr. 50 50 65 1.30 21
In addition to the descriptive steel grade naming system indicated above, within EN 10027-2 is defined a system for creating unique steel grade numbers. While less descriptive and intuitive than the grand names they are easier to tabulate and use in data processing applications.
All of the wide flange shapes and masts were fabricated form ASTM A572 Grade 50 steel, while the diagonal roof bracing were A 500 Grade B. Due to the precisely choreographed steel design, the Flushing Meadow Natatorium received the 2009 Innovative Design in Engineering and Architecture with Structural Steel award. (IDEAS 2).