Description
ASTM A656 High-strength, low-alloy plate
ASTM A656 is a high-strength, low-alloy (HSLA) structural steel plate specification designed for applications requiring greater strength and toughness. It is commonly used in construction equipment, truck frames, bridges, and other structural applications.
Key Features
- High Strength: Available in multiple strength levels, including 50, 60, 70, and 80 ksi (kilopounds per square inch) minimum yield strength.
- Low-Alloy Composition: Provides improved mechanical properties compared to conventional carbon steel.
- Good Weldability & Formability: Suitable for welding and forming processes in structural applications.
- Enhanced Toughness: Ideal for heavy-load and impact-resistant applications.
ASTM A656 Grade Variants
| Grade | Yield Strength (ksi) | Tensile Strength (ksi) |
| A656 Grade 50 | 50 | 60 |
| A656 Grade 60 | 60 | 70 |
| A656 Grade 70 | 70 | 80 |
| A656 Grade 80 | 80 | 90 |
Dimensions
ASTM A656 Grade 60
Thickness: 0.100–1.50 in (2.54–38.1 mm); Length: 72–1020 in (1800–25910 mm); Width: 48–120 in (1200–3050 mm)
ASTM A656 Grade 70
Thickness: 0.100–1.00 in (2.54–25.4 mm); Length: 72–1020 in (1800–25910 mm); Width: 48–120 in (1200–3050 mm)
ASTM A656 Grade 80
Thickness: 0.100–1.00 in (2.54–25.4 mm); Length: 72–1020 in (1800–25910 mm); Width: 48–120 in (1200–3050 mm)
ASTM A656 Grade 100
Thickness: 0.188–0.50 in (4.78–13 mm); Length: 72–720 in (1800–18300 mm); Width: 48–96 in (1200–2400 mm)
ASTM A656 Chemical Composition
| Element | Grade 50 | Grade 60 | Grade 70 | Grade 80 |
| Carbon (C) | ≤ 0.18 | ≤ 0.18 | ≤ 0.18 | ≤ 0.18 |
| Manganese (Mn) | 1.00 – 1.60 | 1.10 – 1.60 | 1.10 – 1.60 | 1.10 – 1.60 |
| Phosphorus (P) | ≤ 0.025 | ≤ 0.025 | ≤ 0.025 | ≤ 0.025 |
| Sulfur (S) | ≤ 0.035 | ≤ 0.035 | ≤ 0.035 | ≤ 0.035 |
| Silicon (Si) | 0.15 – 0.60 | 0.15 – 0.60 | 0.15 – 0.60 | 0.15 – 0.60 |
| Columbium (Niobium) (Cb) | 0.005 – 0.08 | 0.005 – 0.08 | 0.005 – 0.08 | 0.005 – 0.08 |
| Vanadium (V) | 0.01 – 0.10 | 0.01 – 0.10 | 0.01 – 0.10 | 0.01 – 0.10 |
ASTM A656 Mechanical Properties
| Property | Grade 50 | Grade 60 | Grade 70 | Grade 80 |
| Yield Strength (MPa) | ≥ 345 | ≥ 415 | ≥ 485 | ≥ 550 |
| Tensile Strength (MPa) | 455 – 620 | 520 – 690 | 585 – 760 | 620 – 825 |
| Elongation (%) (200mm) | ≥ 18 | ≥ 17 | ≥ 16 | ≥ 14 |
| Elongation (%) (50mm) | ≥ 21 | ≥ 20 | ≥ 19 | ≥ 17 |
ASTM A656 Physical Properties
| Property | Value |
| Density | 7.85 g/cm³ |
| Melting Point | 1425–1540°C |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 45 W/m·K |
| Electrical Resistivity | ~0.15 µΩ·m |
Applications:
- Heavy-duty construction equipment
- Truck frames and trailers
- Structural components in bridges
- Agricultural and mining machinery
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