Corten Steel Plate, also known as weathering steel, is a high-strength steel alloy designed to form a stable rust-like appearance after exposure to weather. Unlike regular steel, Corten does not require painting or additional surface protection — making it ideal for aesthetic architecture and industrial applications. It is widely used in structures where a unique, corrosion-resistant surface is desired.

What is Corten Steel Made Of?

Corten steel contains a chemical composition that allows it to create a protective oxide layer (patina) when exposed to the atmosphere. This layer prevents deeper corrosion and makes the material extremely durable.

Typical Corten Steel Composition:

• Carbon: 0.12% max
• Manganese: 0.20–0.50%
• Silicon: 0.25–0.75%
• Phosphorus: 0.07–0.15%
• Sulfur: 0.03% max
• Copper, Chromium, and Nickel for corrosion resistance

Grades of Corten Steel Plates

• CORTEN A (EN 10025-5 S355J2W) Best for architectural and decorative applications
• CORTEN B (ASTM A588)– Suitable for structural and heavy-duty industrial uses