Overview:
ASTM A871 Steel Plate is an ideal material for structural applications, particularly in the construction of tubular structures and poles. This high-strength weathering steel has atmospheric corrosion resistance, making it perfect for outdoor applications where exposure to weather and environmental conditions is a concern. The steel exhibits properties similar to COR-TEN® steel, meaning it forms a stable, rust-like appearance that protects the material from further corrosion without the need for painting or coating.
Available Sizes
Leeco® Steel stocks the following standard sizes of ASTM A871, but custom sizes may be available upon request.
| Grade | Thickness | Width | Length |
|---|---|---|---|
| Grade 60 | 3/16″ – 1 1/4″ | 48″ – 120″ | Up to 650″ |
| Grade 65 | 3/16″ – 1 1/4″ | 48″ – 120″ | Up to 650″ |
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Thickness: 3/16″ to 1 1/4″
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Width: 48″ to 120″
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Length: Up to 650″ (custom sizes available)
Material Properties
The material properties for ASTM A871 are in accordance with ASTM standards, ensuring high strength and long-lasting durability. These include yield strength, tensile strength, and elongation percentage, which are critical for structural integrity.
| Grade | Yield Point (ksi) | Tensile Strength (ksi) | Min. 8” Elongation (%) |
|---|---|---|---|
| Grade 60 | 60 | 75 | 16 |
| Grade 65 | 65 | 80 | 15 |
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Grade 60: Yield strength of 60 ksi, tensile strength of 75 ksi, and 16% elongation.
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Grade 65: Yield strength of 65 ksi, tensile strength of 80 ksi, and 15% elongation.
These high-strength properties make ASTM A871 an excellent choice for structural applications that demand durability and long-term performance.
Chemical Composition
ASTM A871 steel can be produced in three chemical composition types, each offering specific benefits for corrosion resistance and mechanical performance.
| Element | Type I | Type II | Type IV |
|---|---|---|---|
| Carbon (C) | 0.19% max | 0.20% max | 0.17% max |
| Manganese (Mn) | 0.80-1.35% | 0.75-1.35% | 0.50-1.20% |
| Phosphorus (P) | 0.030% max | 0.030% max | 0.030% max |
| Sulfur (S) | 0.030% max | 0.030% max | 0.030% max |
| Silicon (Si) | 0.30-0.65% | 0.15-0.50% | 0.25-0.50% |
| Nickel (Ni) | 0.40% max | 0.50% max | 0.40% max |
| Chromium (Cr) | 0.40-0.70% | 0.40-0.70% | 0.40-0.70% |
| Copper (Cu) | 0.25-0.40% | 0.20-0.40% | 0.30-0.50% |
| Vanadium (V) | 0.02-0.10% | 0.01-0.10% | 0.005-0.05% |
| Molybdenum (Mo) | – | – | 0.10% max |
| Columbium (Cb) | – | – | 0.005-0.05% |
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Type I: Offers a balanced composition of manganese, copper, and chromium for standard weathering applications.
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Type II: Slightly more controlled silicon and nickel content for environments requiring moderate corrosion resistance.
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Type IV: Includes molybdenum and columbium for enhanced resistance to harsh environments, ideal for severe weather and industrial use.
ASTM A871 Type I vs Type II vs Type IV Comparison
| Feature | Type I | Type II | Type IV |
|---|---|---|---|
| Carbon Content | 0.19% max | 0.20% max | 0.17% max |
| Manganese Content | 0.80-1.35% | 0.75-1.35% | 0.50-1.20% |
| Nickel Content | 0.40% max | 0.50% max | 0.40% max |
| Corrosion Resistance | Good | Moderate | Excellent |
| Best Use | Standard weathering steel | Moderate corrosion areas | Severe environmental conditions |