1. Chemical Composition (Key Elements, % max unless specified)
Carbon (C): ≤0.16
Manganese (Mn): ≤1.70
Silicon (Si): 0.20–0.70
Phosphorus (P): ≤0.035
Sulfur (S): ≤0.030
Chromium (Cr): 0.30–1.25 (critical for patina formation)
Nickel (Ni): 0.30–0.80
Copper (Cu): 0.25–0.55 (enhances corrosion resistance)
Nitrogen (N): ≤0.012
Aluminum (Al): ≥0.020 (for grain refinement)
2. Mechanical Properties
Yield strength (Rp0.2): ≥355 MPa (for thickness ≤16mm; decreases slightly with thicker sections, e.g., 345 MPa for 16–40mm).
Tensile strength (Rm): 470–630 MPa.
Elongation (A): ≥20% (for thickness ≤16mm; minimum values vary slightly with thickness).
Impact toughness: ≥27 J at 0°C (per "J0" designation, indicating impact testing at 0°C).
3. Typical Dimensions
Thickness: Common ranges from 3mm to 100mm (available in sheets/plates).
Width: Typically 1000mm–2500mm (custom widths may be available via rolling).
Length: Up to 12m (standard), with longer lengths possible for specific orders.
4. Application-Oriented Specifications
Surface condition: Usually supplied with a mill scale or shot-blasted surface (to facilitate natural patina formation).
Delivery condition: Hot-rolled (AR, as-rolled) or normalized (N) for improved toughness.
