| Property | Corten Steel (Weathering Steel) | Mild Steel (Carbon Steel, e.g., A36) |
|---|---|---|
| Corrosion Resistance | Forms a protective rust patina (stops further corrosion). | Rusts continuously; requires paint/coatings. |
| Composition | Alloyed with Cu, Cr, P, Ni (e.g., Corten A: 0.25–0.55% Cu). | Primarily iron + carbon (≤0.3% C, no alloys). |
| Maintenance | Low-maintenance (no painting needed). | High-maintenance (regular painting to prevent rust). |
| Cost | 20–30% more expensive. | Cheaper and widely available. |
| Appearance | Rusty aesthetic (used in modern architecture). | Requires paint; no natural aesthetic appeal. |
| Strength | Higher yield strength (e.g., 50 ksi vs. mild steel's 36 ksi). | Lower strength unless heat-treated. |
| Applications | Bridges, sculptures, façades, outdoor structures. | General construction, machinery, indoor uses. |
| Weldability | Requires low-hydrogen electrodes (pre-heating may be needed). | Easier to weld (standard methods). |
