Key Characteristics
1. Material Composition
Alloying Elements:
Copper (Cu), Chromium (Cr), Phosphorus (P), and Nickel (Ni) enhance corrosion resistance.
Low Carbon (C): Improves weldability.
Common Grades:
ASTM A588 (USA)
EN 10025-5 S355J0WP (Europe)
JIS G3125 SPA-H (Japan)
2. Mechanical Properties
| Property | Typical Range |
|---|---|
| Yield Strength | 345–500 MPa |
| Tensile Strength | 485–650 MPa |
| Elongation | 18–22% |
| Impact Toughness | 27J at -20°C |
3. Corrosion Resistance
Forms a dense, adherent patina that slows further rusting.
2–8× more resistant than carbon steel in open atmospheres.
Suitable for unpainted outdoor use.
4. Surface Appearance
Mill scale: Initial rough, bluish-gray surface from hot-rolling.
Weathered look: Develops a rusty orange-brown patina over 6–18 months.
Advantages vs. Cold-Rolled Weathering Steel
| Feature | Hot-Rolled Weathering Steel | Cold-Rolled Weathering Steel |
|---|---|---|
| Surface | Rough, scaled finish | Smooth, uniform finish |
| Strength | Standard (as-rolled) | Higher (work-hardened) |
| Cost | Lower | Higher |
| Thickness | Thicker (≥3mm typical) | Thinner (0.5–3mm typical) |
Applications
Bridges & highways (structural beams, guardrails).
Building façades & architectural cladding.
Shipping containers & railcars.
Transmission towers & utility poles.
