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Home Industry News What is ASTM A588 Corten Steel?

What is ASTM A588 Corten Steel?
2025-12-10

What is ASTM A588?

The ASTM A588 specification is designed specifically to provide superior resistance to atmospheric corrosion, ensuring its suitability for outdoor use where exposure to the elements is a concern.

A key feature of ASTM A588 steel is its natural formation of a protective rust layer when exposed to the atmosphere. This process creates a barrier against further corrosion, enhancing its longevity without needing additional protective coatings. The weathered appearance of ASTM A588 steel is often appreciated for its aesthetic appeal, commonly used in architectural projects.

ASTM A588 steel has a minimum yield strength of 50 ksi and a minimum tensile strength of 70 ksi. However, it’s important to note that weathering steels like ASTM A588 are not suitable for use in load-bearing members under significant stress above 450 degrees Celsius.

 

ASTM A588 Chemical Composition

Elements Composition, %
Grade A Grade B Grade K
CarbonA 0.19 max 0.20 max 0.17 max
ManganeseA 0.80–1.25 0.75–1.35 0.50–1.20
Phosphorus 0.04 max 0.04 max 0.04 max
Sulfur 0.05 max 0.05 max 0.05 max
Silicon 0.30–0.65 0.15–0.50 0.25–0.50
Nickel 0.40 max 0.50 max 0.40 max
Chromium 0.40–0.65 0.40–0.70 0.40–0.70
Molybdenum … … 0.10 max
Copper 0.25–0.40 0.20–0.40 0.30–0.50
Vanadium 0.02–0.10 0.01–0.10 …
Columbium … … 0.005–0.0B

ASTM A588 Steel Mechanical Properties

Plates and Bars Structural Shapes
For Thicknesses 4 in. [100 mm] and Under For Thicknesses Over 4 in. [100 mm] to 5 in. [125 mm] incl For Thicknesses Over 5 in. [125 mm] to 8 in.[200 mm] incl All
Tensile strength, min,ksi [MPa] 70 [485] 67 [460] 63 [435] 70 [485]
Yield point, min, ksi [MPa] 50 [345] 46 [315] 42 [290] 50 [345]
Elongation in 8 in. [200 mm], min, % 18B,C … … 18C
Elongation in 2 in. [50 mm], min, % 21B,C 21B,C 21B,C 21D

ASTM A588 Steel Applications

Bridges: ASTM A588 weathering steel is widely chosen for bridge construction due to its strong tensile strength, resistance to corrosion, and cost-efficiency. It is particularly beneficial for bridges exposed to saltwater, coastal regions, or industrial environments, minimizing maintenance requirements and ensuring long-term structural integrity.

Buildings and Facades: From skyscrapers to residential structures, ASTM A588 is utilized in building facades, curtain walls, and roofing systems. Its distinctive appearance enhances architectural designs while providing robust protection against weathering and corrosion.

Outdoor Structures: ASTM A588 is commonly employed in outdoor structures such as stadiums, pavilions, and open-air theaters. These applications demand materials capable of enduring diverse weather conditions without compromising safety or aesthetics. ASTM A588’s resilience in harsh environments makes it an ideal choice for such projects.

Construction Equipment: Heavy machinery and construction equipment face rigorous conditions, including exposure to corrosive substances and severe weather. ASTM A588’s corrosion resistance and high strength make it a dependable material for components like buckets, loader arms, and chassis, ensuring durability and optimal performance of the equipment.

Related Products

ASTM A588 GrA weathering steel plate

A588GrB Steel Plates

A588 Gr C Weather Resistant Steel Plate

A588 Grade K Weather Resistant Steel Plate

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