Key Features & Properties
1. Material Composition (Chemical Requirements)
| Element | C (max) | Mn | P | S (max) | Si | Cu | Cr | Ni |
|---|---|---|---|---|---|---|---|---|
| % Range | 0.15 | 0.75–1.25 | 0.04–0.12 | 0.05 | 0.15–0.40 | 0.20–0.50 | 0.40–0.80 | ≤0.25 |
Copper (Cu), Chromium (Cr), Phosphorus (P): Enhance corrosion resistance by forming a protective rust patina.
Low Carbon (C): Improves weldability and formability.
2. Mechanical Properties
| Property | Yield Strength (min) | Tensile Strength | Elongation (% min) |
|---|---|---|---|
| Value | 275 MPa (40 ksi) | 415–585 MPa | 25% (for 2" & under) |
Impact Toughness: Typically meets 20 ft-lb (27J) at -20°C (-4°F) (Charpy V-notch).
3. Corrosion Resistance
Forms a stable, self-healing patina when exposed to rain, humidity, and pollutants.
2–8× more resistant than carbon steel in open atmospheres.
Ideal for unpainted outdoor structures (e.g., bridges, fences, façades).
4. Manufacturing & Dimensions
Process: Seamless or ERW (Electric Resistance Welded).
Sizes: Typically 1/2" to 4" NPS (Nominal Pipe Size).
Standards: Complies with ASTM A423 (specific to corrosion-resistant pipes).
