Description
A572 GR 42
A572 Grade 42 is a structural steel grade having a high strength to low alloy content (HSLA) that is widely used in construction and structural applications. It is part of the ASTM A572 specification, which has five grades: 42, 50, 55, 60, and 65. Grade 42 has the lowest minimum yield strength but provides an excellent strength-to-weight ratio and weldability.
Key Features of A572 Grade 42:
- Standard: ASTM A572 / A572M
- Grade: 42
- Type: HSLA (High Strength Low Alloy)
- Form: Plates, Sheets
- Applications: Bridges, buildings, cranes, structural components
A572 Gr 42 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.21 |
| Manganese (Mn) | 0.60–0.90 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Silicon (Si) | ≤ 0.40 |
A572 Gr 42 Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength | ≥ 290 MPa (42 ksi) |
| Tensile Strength | 414–550 MPa (60–80 ksi) |
| Elongation (in 200 mm) | ≥ 20% |
| Elongation (in 50 mm) | ≥ 18% |
Available Dimensions
Mill Plate:
- Thickness: 4.78 mm to 152 mm (0.188″ to 6.00″)
- Width: 1,500 mm to 3,350 mm (60″ to 131.9″)
- Length: 3,050 mm to 25,910 mm (120″ to 1,020″)
Temper Leveled Plate:
- Thickness: 2.54 mm to 15.9 mm (0.100″ to 0.625″)
- Width: 1,200 mm to 2,400 mm (48″ to 96″)
- Length: 1,800 mm to 18,300 mm (72″ to 720″)
Coil for Conversion To:
- Thickness: 4.78 mm to 15.9 mm (0.188″ to 0.625″)
- Width: 1,500 mm to 2,400 mm (60″ to 96″)
Tolerances
Mill Plate:
- Thickness, width, and length tolerances conform to ASTM A6 standards.
- Flatness tolerances are available up to Half-Standard ASTM A6 for plate thicknesses ranging from 9.5 mm to 76.2 mm (3/8″ to 3.0″).
Temper Leveled Plate:
- Thickness, width, and length tolerances adhere to ASTM A6 standards.
- Flatness tolerances meet or exceed Half-Standard ASTM A6, depending on processing and material yield strength.
Coils for Conversion To:
- For minimum gauge orders:
- Thickness and width tolerances comply with ASTM A568 for thicknesses less than 5.84 mm (0.230″).
- ASTM A635 standards apply for thicknesses from 5.84 mm to 25.4 mm (0.230″ to 1.00″).
- Specific thickness tolerances for nominal gauge orders require inquiry.
Advantages
- High strength-to-weight ratio
- Good weldability and formability
- Cost-effective alternative to carbon steel
- Suitable for low-temperature environments
Applications
- Structural steel components in bridges and buildings
- Infrastructure and heavy machinery
- Construction of towers and frames
- Piling and foundations
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