ASTM A588 Grade K Weathering Steel
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ASTM A588 Grade K Weathering Steel
ASTM A588 Grade K Weathering Steel Product Information
ASTM A588 Grade K weathering steel is engineered with a precise balance of copper, chromium, and nickel to accelerate the formation of a dense, adherent oxide layer. This advanced alloy composition provides 2-4x better corrosion resistance than standard carbon steel in rural, urban, and moderately industrial environments. Available as plates, structural shapes, and custom-cut profiles, Grade K maintains its mechanical properties even in sub-zero temperatures, making it suitable for cold-climate infrastructure. Its higher yield-to-tensile ratio (415-550 MPa) makes it the preferred choice for engineers prioritizing both longevity and load-bearing capacity.
ASTM A588 Grade K Weathering Steel Chemical Composition
| Element | Composition Range (wt.%) | Key Role | Special Notes |
|---|---|---|---|
| Carbon (C) | 0.07–0.15% | Controls strength & weldability | Low carbon ensures excellent weldability (CE ≤0.40) |
| Manganese (Mn) | 0.90–1.20% | Enhances hardenability & strength | Optimized for structural stability |
| Phosphorus (P) | ≤0.025% | Limits cold brittleness | Tighter control vs. standard A588 |
| Sulfur (S) | ≤0.010% | Improves weld quality | Ultra-low for crack resistance |
| Silicon (Si) | 0.25–0.40% | Deoxidizer & patina stabilizer | Promotes uniform rust layer |
| Copper (Cu) | 0.28–0.38% | Primary corrosion resistor | Critical for atmospheric protection |
| Chromium (Cr) | 0.45–0.65% | Forms protective oxide layer | Synergizes with Cu for durability |
| Nickel (Ni) | 0.20–0.35% | Enhances toughness | Optional boost to 0.60% for Arctic grades |
| Vanadium (V) | 0.03–0.08% | Grain refiner & strengthener | Unique to Grade K for 415MPa yield |
| Iron (Fe) | Balance | Structural base |
Minimum 96.5% purity |
Key Differentiators
✅ Precision Alloying – Tight Cu/Cr/Ni ratios for consistent patina formation
✅ Enhanced Weldability – Ultra-low S/P vs. conventional weathering steels
✅ Grade K Exclusive – V-microalloying enables higher yield strength (415MPa)
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