What is SA572 Grade 50 material?
SA572 Grade 50 is a high-strength low-alloy (HSLA) structural steel specified under ASTM A572.
It provides high yield strength (345 MPa / 50 ksi), good weldability, and improved toughness, making it widely used in bridges, buildings, cranes, structural beams, and transportation equipment.
Its enhanced strength-to-weight ratio makes it a preferred choice for modern structural engineering.
Chemical Composition (Typical Limits)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.23 |
| Manganese (Mn) | 0.60–1.50 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Silicon (Si) | ≤ 0.40 |
| Vanadium (V) | ≤ 0.15 |
| Columbium/Niobium (Nb) | ≤ 0.05 |
| Copper (Cu, optional) | ≤ 0.60 |
Actual mill values may vary but must meet ASTM A572 Grade 50 requirements.
Mechanical Properties
| Mechanical Property | Value |
|---|---|
| Yield Strength (min.) | 345 MPa (50 ksi) |
| Tensile Strength (min.) | 450–620 MPa (65–90 ksi) |
| Elongation | 18–20% (depending on thickness) |
| Hardness (approx.) | 150–200 HBW |
| Density | 7.85 g/cm³ |
Key Features
High yield strength for reduced material weight
Good weldability and formability
Better toughness than standard carbon steel
Suitable for demanding structural applications
What is the density of SA572 Grade 50?
The density of SA572 Grade 50 steel is essentially the same as other carbon and low-alloy structural steels.
Density of SA572 Grade 50 Steel
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Density (lb/in³) | 0.284 lb/in³ |
| Density (kg/m³) | 7850 kg/m³ |
SA572 Grade 50 is an HSLA (High-Strength Low-Alloy) steel, and its density does not significantly differ from standard carbon steels because its alloy additions (Mn, Si, V, Nb, Cu) are small.
For weight calculations, engineers universally use 7850 kg/m³.
What materials are equivalent to SA572 Grade 50?
Materials Equivalent to SA572 Grade 50
Although exact one-to-one equivalence depends on application and design code, the following materials are generally considered comparable in mechanical properties and usage.
U.S. & ASTM / AISC Equivalents
| Material | Standard | Notes |
|---|---|---|
| A572 Grade 50 | ASTM | Same material family |
| A992 | ASTM | Widely used for W-shapes; similar yield (50 ksi) with better weldability |
| A709 Grade 50 | ASTM | Bridge steel; essentially equivalent but with additional notch-toughness requirements |
| A588 (Grade 50 level) | ASTM | Weathering steel with similar strength |
| A913 Grade 50 | ASTM | High-strength, low-alloy structural steel for rolled shapes |
International Equivalents
≈ European Standards
| Material | Standard | Notes |
|---|---|---|
| S355JR / S355J2 | EN 10025-2 | Closest European equivalent (355 MPa yield ≈ 50 ksi) |
| S355NL | EN 10025-3 | Enhanced low-temperature toughness |
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