Description
ASTM A572 Steel Plate is widely used in construction and various applications requiring high strength and good weldability. The designation A572 refers to a series of steel grades that differ primarily in yield strength. Here’s a detailed description of the different grades under A572:
Overview of A572 Steel Grades
A572 Grade 42:
- Yield Strength: 42 ksi (290 MPa)
- Noted for good weldability and formability, suitable for various structural applications.
A572 Grade 50:
- Yield Strength: 50 ksi (345 MPa)
- It is commonly used in construction due to its strength and versatility, especially in bridges and buildings.
A572 Grade 55:
- Yield Strength: 55 ksi (380 MPa)
- It offers a higher strength than Grade 50, making it suitable for more demanding applications.
A572 Grade 60:
- Yield Strength: 60 ksi (415 MPa)
- They are used in structures where higher strength is needed, including heavy construction and fabrication.
A572 Grade 65:
- Yield Strength: 65 ksi (450 MPa)
- The highest strength among the A572 grades, ideal for large structural components and demanding environments.
Key Properties
- Weldability: A572 steel plates are known for their excellent weldability, making them suitable for a wide range of fabrication techniques.
- Strength-to-Weight Ratio: The high yield strength of A572 grades allows for thinner, lighter components that still meet structural requirements.
- Ductility: The low alloy content provides good ductility and toughness, which is crucial for structures subjected to dynamic loads.
- Corrosion Resistance: The addition of alloying elements contributes to improved resistance to atmospheric corrosion.
Application
- Construction
- Heavy Equipment
- Transportation
ASTM A572 Chemical Composition
Element | A572 Grade 42 | A572 Grade 50 | A572 Grade 55 | A572 Grade 60 | A572 Grade 65 |
---|---|---|---|---|---|
Carbon (C) | ≤ 0.21% | ≤ 0.23% | ≤ 0.23% | ≤ 0.23% | ≤ 0.23% |
Manganese (Mn) | 1.35% - 1.65% | 1.35% - 1.65% | 1.35% - 1.65% | 1.35% - 1.65% | 1.35% - 1.65% |
Phosphorus (P) | ≤ 0.04% | ≤ 0.04% | ≤ 0.04% | ≤ 0.04% | ≤ 0.04% |
Sulfur (S) | ≤ 0.05% | ≤ 0.05% | ≤ 0.05% | ≤ 0.05% | ≤ 0.05% |
Silicon (Si) | 0.15% - 0.40% | 0.15% - 0.40% | 0.15% - 0.40% | 0.15% - 0.40% | 0.15% - 0.40% |
Copper (Cu) | ≤ 0.20% | ≤ 0.20% | ≤ 0.20% | ≤ 0.20% | ≤ 0.20% |
Nickel (Ni) | ≤ 0.40% | ≤ 0.40% | ≤ 0.40% | ≤ 0.40% | ≤ 0.40% |
Chromium (Cr) | ≤ 0.25% | ≤ 0.25% | ≤ 0.25% | ≤ 0.25% | ≤ 0.25% |
Molybdenum (Mo) | ≤ 0.10% | ≤ 0.10% | ≤ 0.10% | ≤ 0.10% | ≤ 0.10% |
Vanadium (V) | ≤ 0.08% | ≤ 0.08% | ≤ 0.08% | ≤ 0.08% | ≤ 0.08% |
ASTM A572 Mechanical Properties
Property | A572 Grade 42 | A572 Grade 50 | A572 Grade 55 | A572 Grade 60 | A572 Grade 65 |
---|---|---|---|---|---|
Yield Strength (min) | 42 ksi (290 MPa) | 50 ksi (345 MPa) | 55 ksi (380 MPa) | 60 ksi (415 MPa) | 65 ksi (450 MPa) |
Tensile Strength (min) | 60 ksi (415 MPa) | 65 ksi (450 MPa) | 70 ksi (485 MPa) | 75 ksi (515 MPa) | 80 ksi (550 MPa) |
Elongation (in 8 in.) | 21% | 20% | 19% | 18% | 17% |
Elongation (in 2 in.) | 21% | 20% | 19% | 18% | 17% |
Charpy V-Notch (min) | 20 ft-lb @ -20°F | 20 ft-lb @ -20°F | 20 ft-lb @ -20°F | 20 ft-lb @ -20°F | 20 ft-lb @ -20°F |
Reduction of Area | 30% | 30% | 30% | 30% | 30% |
ASTM A572 Physical Properties
Property | Value |
---|---|
Density | 0.283 lb/in³ (7.85 g/cm³) |
Modulus of Elasticity | 29,000 ksi (200 GPa) |
Poisson's Ratio | 0.26 - 0.30 |
Thermal Conductivity | 43 - 50 BTU·in/(hr·ft²·°F) (74 - 87 W/m·K) |
Coefficient of Thermal Expansion | 6.5 - 7.5 × 10⁻⁶ /°F (11.7 - 13.5 × 10⁻⁶ /°C) |
Specific Heat Capacity | 0.11 BTU/(lb·°F) (0.46 kJ/(kg·K)) |
Melting Point | Approximately 2,500°F (1,370°C) |
Electrical Resistivity | 10.0 - 10.5 µΩ·m |
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