Lingang New Area, China (Shanghai) Zona Franca Piloto
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Lingang New Area, China (Shanghai) Zona Franca Piloto
ASTM A709 steel is a high-strength, low-alloy structural steel that is used in a variety of applications, including bridges, buildings, and highways. This steel is known for its excellent strength, durability, and toughness, making it a popular choice for construction projects around the world.
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ASTM A709 steel is the standard specification for structural steel used in bridge and other structural applications. This specification covers carbon and high-strength low-alloy steel plates and structural shapes designed for use in bridges, with an emphasis on providing better mechanical properties and improved atmospheric corrosion resistance for longer service life.
ASTM A709 steel (commonly used in bridges)
| Grade | Yield Strength (ksi) | Tensile Strength (ksi) | Elongation (%) | Corrosion Resistance | Notes |
|---|---|---|---|---|---|
| A709 Grade 36 | 36 | 58-80 | 20 (in 2″) | Standard | Standard structural steel. |
| A709 Grade 50 | 50 | 65-85 | 18 (in 2″) | Moderate | Higher yield strength, general bridge use. |
| A709 Grade 50W | 50 | 70-90 | 18 (in 2″) | Weathering | Improved atmospheric corrosion resistance, similar to Corten steel. |
| A709 Grade HPS 50W | 50 | 70-90 | 18 (in 2″) | Weathering | High-performance steel with weathering properties for bridge applications. |
| A709 Grade HPS 70W | 70 | 85-110 | 16 (in 2″) | Weathering | Higher strength version of Grade 50W, weather-resistant. |
| A709 Grade HPS 100W | 100 | 110-130 | 16 (in 2″) | Weathering | High-performance, high-strength steel with weathering properties. |
ASTM A709 steel Chemical Composition (Maximum Values, % by Weight)
| Element | Grade 36 | Grade 50 & 50W | HPS 50W | HPS 70W | HPS 100W |
|---|---|---|---|---|---|
| Carbon (C) | 0.26 | 0.23 | 0.11 | 0.11 | 0.11 |
| Manganese (Mn) | 1.35 | 1.35 | 1.35 | 1.35 | 1.65 |
| Phosphorus (P) | 0.04 | 0.04 | 0.02 | 0.02 | 0.02 |
| Sulfur (S) | 0.05 | 0.05 | 0.01 | 0.01 | 0.01 |
| Silicon (Si) | 0.40 | 0.40 | 0.40 | 0.40 | 0.40 |
| Copper (Cu) | N/A | 0.20 | 0.25 | 0.25 | 0.25 |
| Chromium (Cr) | N/A | 0.45 | 0.40 | 0.40 | 0.50 |
| Nickel (Ni) | N/A | 0.25 | 0.40 | 0.40 | 0.50 |
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