Corten steel, also known as weathering steel, is a high-strength, low-alloy steel designed to form a stable rust-like appearance after exposure to weather. ASTM standards govern the specifications for Corten steel. Here are the key specifications for the most common types of Corten steel:
1. Corten A (ASTM A242)
Yield Strength: 50,000 psi (345 MPa)
Tensile Strength: 70,000 psi (485 MPa)
Elongation: 20% minimum in 8 inches (200 mm)
Application: Typically used for structural applications, architectural projects, and decorative elements. Corten A has a higher phosphorus content which provides improved weathering properties, making it suitable for thinner materials.
2. Corten B (ASTM A588)
Yield Strength: 50,000 psi (345 MPa)
Tensile Strength: 70,000 psi (485 MPa)
Elongation: 18% minimum in 8 inches (200 mm)
Application: Used in heavier structures such as bridges and industrial buildings. Corten B offers better mechanical properties and is designed for thicker sections.
Key Properties of Corten Steel:
Corrosion Resistance: Forms a protective oxide layer (patina) that slows down further corrosion when exposed to atmospheric conditions, making it ideal for outdoor use.
Weldability: Corten steel is weldable using conventional welding methods.
Formability: It has good formability and can be easily rolled or bent.
Common Applications:
Bridges
Building facades
Sculptures and artworks
Shipping containers
Railroad cars
Garden structures and planters
Corten steel's ability to weather naturally, along with its aesthetic rust finish, makes it a popular choice for both structural and decorative applications.
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