Pipeline Steel Billet Q345B is a specialized low-alloy high-strength steel designed to meet the rigorous demands of oil, gas, water, and industrial pipeline construction. Compliant with GB/T 1591-2008 standards, this billet combines exceptional strength, toughness, and weldability—making it an indispensable material for safe, durable, and efficient pipeline systems.
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Product details
This Q345B pipeline steel billet is engineered to balance strength, weldability, and toughness—key requirements for reliable pipeline systems. Its chemical and mechanical properties ensure performance under internal pressure, external loads, and environmental stress, making it a trusted choice for energy and infrastructure projects.
| Parameter | Value | Remarks |
|---|---|---|
| Standard | GB/T 1591-2008 | Low alloy high-strength structural steel |
| Grade | Q345B | Impact tested at 20℃ |
| Chemical Composition (wt%) | ||
| – Carbon (C) | ≤0.20 | Controlled for weldability in pipeline applications |
| – Silicon (Si) | ≤0.55 | |
| – Manganese (Mn) | ≤1.70 | Enhances strength and toughness |
| – Phosphorus (P) | ≤0.040 | Minimized to reduce brittleness in pipeline service |
| – Sulfur (S) | ≤0.040 | Low content ensures good weldability and ductility |
| – Niobium (Nb) | ≤0.07 | Microalloying element for grain refinement |
| – Vanadium (V) | ≤0.15 | Improves strength and heat resistance |
| – Titanium (Ti) | ≤0.20 | Enhances toughness and structural stability |
| – Nitrogen (N) | ≤0.012 | Controlled to prevent embrittlement |
| Mechanical Properties | ||
| – Yield Strength (ReL) | ≥345 MPa | For thickness ≤16mm; critical for pressure resistance |
| – Tensile Strength (Rm) | 470–630 MPa | Ensures integrity under pipeline operating pressures |
| – Elongation (A) | ≥21% | Allows flexibility for pipeline installation/expansion |
| – Impact Energy (Akv) | ≥34 J | At 20℃ (longitudinal specimen), resists fracture from dynamic loads |
| – Bending Test | 180° | Bend diameter: 2a (≤16mm) / 3a (>16mm) for forming pipeline components |
| Delivery Condition | Hot rolled, normalized, TMCP (Thermo-Mechanical Control Process) | Tailored for pipeline fabrication requirements |
| Typical Applications | Oil/gas transmission pipelines, water transport pipelines, industrial fluid pipelines, and pressure vessel components | Designed for high-pressure, long-distance, and harsh environment service |
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