09CuPCrNi-A is an advanced weathering & acid-resistant steel developed for extreme corrosion resistance in harsh industrial and marine environments. It combines copper (Cu), phosphorus (P), chromium (Cr), and nickel (Ni) to form a dense, self-protecting oxide layer that prevents further rusting and resists acidic pollutants.
Key Advantages:
Exceptional corrosion resistance (3–8× better than carbon steel)
Acid & chemical resistance (ideal for polluted/industrial zones)
High strength & weldability (suitable for structural applications)
Low maintenance (rust layer acts as a natural barrier)
Aesthetic rust patina (used in modern architecture)
Chemical Composition (%)
| Element | C ≤ | Si | Mn | P | S ≤ | Cu | Cr | Ni |
|---|---|---|---|---|---|---|---|---|
| 09CuPCrNi-A | 0.12 | 0.10–0.40 | 0.20–0.50 | 0.07–0.12 | 0.030 | 0.25–0.55 | 0.30–1.25 | 0.12–0.65 |
Mechanical Properties
| Property | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Test Temp. |
|---|---|---|---|---|
| 09CuPCrNi-A | ≥345 | 480–630 | ≥22 | -40°C |
Corrosion & Acid Resistance Performance
Atmospheric Corrosion Resistance:
Performs exceptionally in industrial, coastal, and urban atmospheres.
Rust layer stabilizes within 6–18 months, reducing further degradation.
Acid & Chemical Resistance:
Resists sulfur dioxide (SO₂), chlorides, and weak acids better than standard weathering steel.
Ideal for chemical plants, pollution-heavy zones, and marine structures.
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