S235J2W Steel: High-Temperature Corrosion Resistance & Temperature Properties
1. Overview of S235J2W
Standard: EN 10025-5 (European weathering steel)
Type: Atmospheric corrosion-resistant steel (similar to Corten steel)
Key Feature: Forms a protective rust layer ("patina") for long-term outdoor durability.
2. High-Temperature Corrosion Resistance
S235J2W is not designed for high-temperature service (e.g., boilers, exhaust systems). Its corrosion resistance is optimized for ambient atmospheric conditions, not extreme heat.
Temperature Limits & Behavior
| Condition | Performance |
|---|---|
| Room Temp - 300°C | Retains weathering resistance; patina remains stable. |
| 300°C - 600°C | Rust layer may degrade; oxidation accelerates. |
| >600°C | Significant scaling and strength loss (not recommended). |
Comparison to Heat-Resistant Steels:
For high-temp applications (e.g., furnaces), use austenitic stainless (304H, 310S) or alloy steels (T11, T22).
3. Mechanical Properties vs. Temperature
| Temperature | Yield Strength (MPa) | Tensile Strength (MPa) | Impact Toughness |
|---|---|---|---|
| 20°C | 235 (min) | 360-510 | 27J at -20°C |
| 200°C | ~200 | ~340 | Slightly reduced |
| 400°C | ~150 | ~300 | Brittle risk ↑ |
Key Notes:
Strength drops significantly above 300°C.
Avoid prolonged use >400°C (risk of creep deformation).
