ASTM A709 Structural Steel Plates

ASTM A709 steel is Carbon and high-strength low-alloy steel structural shapes, and plates; quenched and tempered alloy steel, for structural plates meant for use in bridges.

ASTM A709 Structural Steel Plates Specification

Gauge Thickness: 0.59" to 3.75"
Width: Up to 72"
Standards: ASTM 709
Grades:   A709 Grade 50, A709 Gr.36, A709 Gr.50S, A709 Gr.50W,A709 Gr. QST 50S,A709 Gr. QST 50, A709 HPS 50W
Source:    Strip Mill Coil
Patterns: U.S. Four-Way Safety Plate with medium size relief lug pattern
ASTM 709 Structural Steel Plates Tensile Requirement
Strength, Yield Strength ksi (MPa), Tensile Strength ksi (MPa): Stronger, 58-130 (400-900)
Formability: % Elongation: Low for some grades, 14-21%
For better formability consider Drawing Steel
Joining – Fair
Design and welding must account for stresses.
Corrosion Resistance – Good   
Galvanizing will slow corrosion.   For longer life in harsh chemical conditions, consider Galvanized or Coated Steel
Chemistry – Low carbon, high manganese and silicon, alloyed with copper, Chromium, Nickel, and Molybdenum
Cost – Higher.  
Good when thinner or stronger steels will add value.

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