Description
What is ASTM A572 Steel Plate?
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 ASTM 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.
ASTM A572 Steel Plate Dimensions
Width
ASTM A572 Grade 50 steel plates are 1500–4020 mm wide
ASTM A572 Grade 65 steel plates are 1500–4050 mm wide
ASTM A572 Grade 42 steel plates are 1500–4050 mm wide
Thickness
ASTM A572 Grade 50 steel plates are 8–300 mm thick
ASTM A572 Grade 65 steel plates are 6–300 mm thick
ASTM A572 Grade 42 steel plates are 6–300 mm thick
Length
ASTM A572 Grade 50 steel plates are 3000–27000 mm long
ASTM A572 Grade 65 steel plates are 3000–15000 mm long
ASTM A572 Grade 42 steel plates are 3000–15000 mm long
Grade 42, 50, 55, 60 & 65 Steel Plate 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% |
Grade 42, 50, 55, 60 & 65 Steel Plate 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% |
Grade 42, 50, 55, 60 & 65 Steel Plate 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 |
Application
- Construction
- Heavy Equipment
- Transportation
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