This H-Type Billet Q345B is widely used in the construction and engineering fields due to its excellent combination of strength, toughness and good workability. It can meet the diverse requirements of different structural designs and construction projects.
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Product details
Q345B H-Type Billet is a premium low-alloy high-strength structural steel engineered for demanding construction and engineering projects. Compliant with GB/T 1591-2008 standards, this H-profiled billet delivers an exceptional blend of strength, toughness, and workability, making it a preferred choice for structural frameworks requiring reliable performance under heavy loads.
| Parameter | Value | Remarks |
|---|---|---|
| Standard Referenced | GB/T 1591-2008 | Low alloy high-strength structural steel standard |
| Grade | Q345B | Impact test temperature is 20℃ |
| Chemical Composition (wt%) | ||
| – Carbon (C) | ≤0.20 | |
| – Silicon (Si) | ≤0.55 | |
| – Manganese (Mn) | ≤1.70 | |
| – Phosphorus (P) | ≤0.040 | |
| – Sulfur (S) | ≤0.040 | |
| – Niobium (Nb) | ≤0.07 | Microalloying element to improve properties |
| – Vanadium (V) | ≤0.15 | |
| – Titanium (Ti) | ≤0.20 | |
| – Nitrogen (N) | ≤0.012 | |
| Mechanical Properties | ||
| – Yield Strength (ReL) | ≥345 MPa | For thickness or diameter ≤16mm; use Rp0.2 if yield point not clear |
| – Tensile Strength (Rm) | 470 – 630 MPa | |
| – Elongation (A) | ≥21% | |
| – Impact Energy (Akv) | ≥34 J | At 20℃, longitudinal specimen |
| – Bending Test | 180° | Bend diameter: 2a for ≤16mm; 3a for >16mm (where ‘a’ represents relevant dimension like thickness or diameter) |
| Delivery Condition | Hot rolled, normalized, normalized + tempered, TMCP (Thermo-Mechanical Control Process) etc. | Based on customer’s specific order requirements |
| Typical Applications | H-shaped steel structures in construction, bridges, industrial buildings, and also for some framework components where high strength and good formability are needed |
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