A572 Grade 50 is a high-strength, low-alloy columbium-vanadium structural steel widely used in H-Beams for heavy-duty construction. Its properties are comparable to Q345B steel under the Chinese GB/T 1591 standard, which is also a low-alloy, high-strength steel suitable for structural applications.
Chemical Composition Comparison (%)
| Grade | C max | Mn % | P max | S max | Si max |
|---|---|---|---|---|---|
| A572 Gr50 | ≤0.23 | ≤1.35 | ≤0.030 | ≤0.030 | ≤0.40 |
| Q345B | ≤0.20 | 1.00–1.60 | ≤0.040 | ≤0.040 | ≤0.55 |
Mechanical Properties Comparison
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation % (200mm) | Elongation % (50mm) |
|---|---|---|---|---|
| A572 Gr50 | 345 | 450 min | 18 | 21 |
| Q345B | 345 | 470–630 | 22 | 22 |
Applications
H-Beams made from A572 Grade 50 or Q345B are commonly used in:
Bridges, highways, and industrial buildings
Heavy machinery and structural frameworks
Steel structures requiring high strength, durability, and impact resistance
Gnee Steel can supply A572 Grade 50 and Q345B H-Beams in various sizes with custom processing options. Contact us for more information or pricing inquiries.
