Corten B (per EN 10025-5) features the following chemical composition ranges (by weight percentage), presented in a horizontal table for clarity:
| Element | Carbon (C) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) | Chromium (Cr) | Copper (Cu) | Nickel (Ni) | Vanadium (V) | Titanium (Ti) | Niobium (Nb) | Nitrogen (N) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Content Range | ≤ 0.12% | ≤ 1.00% | ≤ 0.50% | ≤ 0.035% | ≤ 0.035% | 0.40–0.80% | 0.25–0.55% | ≤ 0.65% | ≤ 0.12% | ≤ 0.15% | ≤ 0.06% | ≤ 0.012% |
Corrosion-Resistant Elements: Chromium (0.40–0.80%) and copper (0.25–0.55%) are the core-they react with oxygen to form the dense, protective patina that defines weathering steels.
Low Carbon Content: ≤ 0.12% carbon ensures good weldability and avoids brittle zones in the heat-affected zone during fabrication.
Controlled Harmful Elements: Strict limits on phosphorus (≤ 0.035%) and sulfur (≤ 0.035%) prevent brittle inclusions and corrosion initiation points.
Auxiliary Elements: Nickel, vanadium, titanium, and niobium enhance strength and toughness without compromising weathering performance.
