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S355jowp Corten
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Product Details
S355J0WP is a European standard weathering steel grade specified in EN 10025-5. It is designed for structural and architectural applications requiring enhanced atmospheric corrosion resistance and reliable mechanical performance.
The “S355” indicates a minimum yield strength of 355 MPa, while “J0” refers to impact testing at 0°C. The “WP” designation highlights its improved resistance to weather conditions.
Chemical Composition of S355J0WP
S355J0WP contains specific alloying elements that enable the formation of a stable protective rust layer.
Typical Chemical Composition (wt%)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Silicon (Si) | 0.25 – 0.75 |
| Manganese (Mn) | 0.20 – 1.50 |
| Phosphorus (P) | 0.07 – 0.15 |
| Sulfur (S) | ≤ 0.03 |
| Copper (Cu) | 0.25 – 0.55 |
| Chromium (Cr) | 0.30 – 1.25 |
| Nickel (Ni) | ≤ 0.65 |
Key Insight:
Copper, chromium, and phosphorus are essential for forming a dense, adherent patina that improves corrosion resistance compared to ordinary carbon steel.
Mechanical Properties
S355J0WP offers a strong balance of strength, toughness, and workability.
Mechanical Properties Table
| Property | Value |
|---|---|
| Yield Strength | ≥ 355 MPa |
| Tensile Strength | 470 – 630 MPa |
| Elongation | ≥ 20% |
| Impact Energy (Charpy V) | ≥ 27 J at 0°C |
Key Performance Characteristics
Atmospheric Corrosion Resistance
S355J0WP forms a protective rust layer that significantly reduces further corrosion. Under suitable conditions, it performs several times better than standard carbon steel.
Low Maintenance
The stable patina eliminates the need for painting or coating, reducing maintenance costs over time.
Good Weldability
The relatively low carbon content ensures compatibility with standard welding processes when proper procedures are followed.
Structural Strength
With a yield strength of 355 MPa, it is suitable for both load-bearing and decorative applications.
Common Applications of S355J0WP
S355J0WP is widely used in environments where both durability and appearance are important.
Structural and Infrastructure
- Bridges and highway structures
- Railway wagons and containers
- Transmission towers
Architectural Applications
- Building facades and cladding
- Curtain wall systems
- Roofing and exterior panels
Landscape and Urban Design
- Garden planters and edging
- Tree grates and urban furniture
- Outdoor sculptures and installations
Advantages Compared to Ordinary Carbon Steel
| Feature | S355J0WP Corten Steel | Carbon Steel |
|---|---|---|
| Corrosion Resistance | High | Low |
| Maintenance | Minimal | Requires coating |
| Lifespan (Outdoor) | 25–50+ years | 5–15 years |
| Appearance | Natural rust finish | Industrial surface |
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