ASTM A606-4 — Improved weather-resistant high-strength low-alloy steel plates/strips
Grades
Type 4 (Corten-B 薄规格)
Chemical composition and mechanical properties
| Grade | Chemical composition | Mechanical properties |
|---|---|---|
| Type 4 | C≤0.22, Mn≤1.25, P 0.07-0.15, S≤0.040, Si 0.20-0.75, Cr 0.30-1.25, Cu 0.20-0.55, Ni≤0.65 | Rm ≥480 MPa (thin plate ≥450), Rp0.2 ≥345 MPa (thin plate ≥310), A≥22%, weather resistance |
Application scope
ASTM A606-4 specifies high-strength, low-alloy hot-rolled and cold-rolled steel sheets and strips with improved atmospheric corrosion resistance, primarily Type 4 grades, and are thin-gauge weather-resistant products. The use of elements such as chromium and copper enhances corrosion resistance, forming a stable rust layer when exposed, reducing the need for painting. Products are available in both hot-rolled and cold-rolled deliveries, balancing high strength with good formability and weldability, making them suitable for thin-plate structures where aesthetics are important.
Typical applications
It is widely used in thin-plate architectural decoration and curtain wall panels, such as exterior wall cladding, roof panels, and facade components, as well as outdoor furniture, signage, and landscaping installations. Due to its good formability and resistance to atmospheric corrosion, it is commonly found in corrosion-resistant components such as automotive exhaust systems and various thin structural parts. It is suitable for outdoor thin-walled products that require a rust-colored texture, no painting or maintenance, and cold bending capabilities.
