ASTM A572 Structural Steel Plate

What is ASTM A572 Plate?

ASTM A572 plate refers to a high-strength low-alloy (HSLA) structural steel plate that conforms to the ASTM A572 specification. ASTM A572 is a standard specification for high-strength low-alloy columbium-vanadium structural steel shapes, plates, sheet piling, and bars. Used in bridges, ships, pressure vessels where high strength is required.

The ASTM A572 specification covers five grades of high-strength low-alloy structural steel plates, which are designated as A572 Grade 42, A572 Grade 50, A572 Grade 55, A572 Grade 60, and A572 Grade 65. These grades have different mechanical properties and are suitable for various applications in structural engineering.

Material Composition

The steel contains 0.25% max carbon along with 1-1.5% manganese, 0.15-0.5% silicon and micro-alloy additions to provide superior mechanical properties over A36.

A572 GradeCarbonManganesePhosphorusSulfurSilicon
Grade 420.00210.01350.00030.00030.15-0.40%
Grade 500.00230.01350.00030.00030.15-0.40%
Grade 550.00250.01350.00030.00030.15-0.40%
Grade 600.00260.01350.00030.00030.004
Grade 65 Less Than 1/2″ Thick0.00260.01350.00030.00030.004
Grade 65 Over 1/2″ to 1 1/4″ Thick0.00230.01650.00030.00030.004
Material Composition Table

Manufacturing Process

Hot rolled from reheated ingots followed by accelerated cooling. Thermomechanical controls result in fine grains for enhanced strength levels compared to mild steels.

Mechanical Properties

A572 GradeYield Point (KSI) [MPa]Tensile Strength (KSI) [MPa]Min. 8” Elongation %
Grade 4242 [290]60 [414]20
Grade 5050 [345]65 [448]18
Grade 5555 [379]70 [483]17
Grade 6060 [414]75 [517]16
Grade 6565 [448]80 [552]15
Mechanical Properties Table

Plate Forms and Sizes

ASTM A572 plates are typically supplied in the as-rolled condition and can be further processed by heat treatment or mechanical techniques. They are available in various thicknesses and widths to suit different construction needs. Available in various thicknesses and widths as required by fabricators.

A572 Steel Equivalent

ASTM A572 steel does not have a direct equivalent in other international standards. However, there are similar steel grades in other standards that can be considered as alternatives.

One common alternative is EN 10025-2 S355JR steel. EN 10025-2 is a European standard for hot-rolled structural steel. S355JR is a non-alloy structural steel grade that is widely used in Europe and has similar mechanical properties to ASTM A572 Grade 50 steel.

Another alternative is JIS G3106 SM490A steel. JIS G3106 is a Japanese standard for hot-rolled steels for welded structure. SM490A is a low carbon, high strength steel that is commonly used in bridges, ships, vehicles, oil storage tanks, and other structural applications. It’s important to note that while these alternatives have similar mechanical properties to ASTM A572 steel, there may be some differences in chemical composition and other specifications..


These plates offer high strength, good formability, and excellent weldability, making them suitable for a wide range of structural applications. They are often used in heavy construction equipment, building structures, and other load-bearing applications that require high strength and durability. In addtion, Bridges, ports, shipbuilding, heavy machinery, pressure vessels where higher strength than A36 is required. Higher strength-to-weight ratio enables economic designs.

Inspection and Testing

Each plate is NDT tested and accompanied with certified mill test reports including chemical analysis and mechanical properties as per A572 standards.

Handling and Storage

Proper support with blocking, dunnage. Parking/storage on levelled ground to prevent damage or corrosion during field assembly, erection or use.

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