Key Features of SMA400AW
1. Material Standard & Equivalent Grades
| Property | Details |
|---|---|
| Standard | JIS G 3106 (Welded Structure Rolled Steel) |
| Type | Weathering Steel (AW = Atmospheric Corrosion Resistant) |
| Comparable Grades | ASTM A588 (USA), EN 10025-5 S355J0WP (EU), IS 2062 WR50B (India) |
2. Chemical Composition (%)
| Element | C (max) | Si (max) | Mn (max) | P (max) | S (max) | Cu | Cr |
|---|---|---|---|---|---|---|---|
| Range | 0.20 | 0.55 | 1.60 | 0.035 | 0.035 | 0.25-0.55 | 0.30-1.25 |
Copper (Cu) & Chromium (Cr): Enhance corrosion resistance by forming a protective rust layer ("patina").
Low Carbon (C): Ensures good weldability.
3. Mechanical Properties
| Grade | Yield Strength (MPa, min) | Tensile Strength (MPa) | Elongation (% min) |
|---|---|---|---|
| SMA400AW | 400 | 490-610 | 17 (if t ≤ 16mm) |
High Strength: Suitable for load-bearing structures.
Impact Toughness: Typically meets 27J at -5°C (Charpy V-notch).
4. Corrosion Resistance
Forms a stable rust layer when exposed to weather, reducing further corrosion.
2–8x longer lifespan vs. carbon steel in outdoor environments.
Fabrication & Welding Guidelines
Cutting: Plasma, laser, or oxyfuel recommended.
Welding: Use low-hydrogen electrodes (e.g., E7018).
Preheating: Required for thick plates (>25mm).
Bending: Possible but requires proper tooling due to high strength.
