Pressure Vessel Steel Billet Q345B is a high-performance low-alloy structural steel specifically engineered for the demanding requirements of pressure vessel manufacturing. Compliant with GB/T 1591-2008 standards, this billet delivers an optimal blend of strength, toughness, and weldability—critical attributes for equipment designed to contain gases, liquids, or vapors under pressure.
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Product details
This Pressure Vessel Steel Billet Q345B is designed to meet the strict requirements of pressure vessel manufacturing with its well-balanced chemical composition and reliable mechanical properties, ensuring safety and durability in applications where containing pressure is a key concern.
| Parameter | Value | Remarks |
|---|---|---|
| Standard | GB/T 1591-2008 | Low alloy high-strength structural steel standard applicable here |
| Grade | Q345B | Impact tested at 20℃ |
| Chemical Composition (wt%) | ||
| – Carbon (C) | ≤0.20 | To ensure good weldability and avoid excessive hardening during heat treatment |
| – Silicon (Si) | ≤0.55 | Helps in deoxidation and affects the strength and toughness to some extent |
| – Manganese (Mn) | ≤1.70 | Contributes to increasing strength and improving toughness |
| – Phosphorus (P) | ≤0.040 | Kept at a low level to prevent embrittlement and ensure good performance in pressure conditions |
| – Sulfur (S) | ≤0.040 | Low sulfur content is crucial for good formability and weldability |
| – Niobium (Nb) | ≤0.07 | Microalloying element for grain refinement and improvement of mechanical properties |
| – Vanadium (V) | ≤0.15 | Can enhance strength and heat resistance properties |
| – Titanium (Ti) | ≤0.20 | Aids in improving toughness and structural stability |
| – Nitrogen (N) | ≤0.012 | Controlled to avoid nitrogen-induced embrittlement |
| Mechanical Properties | ||
| – Yield Strength (ReL) | ≥345 MPa | For thickness ≤16mm; an important parameter for withstanding internal pressure in pressure vessels |
| – Tensile Strength (Rm) | 470–630 MPa | Ensures the overall structural integrity of the pressure vessel under various loading conditions |
| – Elongation (A) | ≥21% | Provides necessary ductility to accommodate possible deformation during operation or pressure changes |
| – Impact Energy (Akv) | ≥34 J | At 20℃ (longitudinal specimen), crucial for resisting sudden impact and avoiding brittle fracture |
| – Bending Test | 180° | Bend diameter: 2a for ≤16mm; 3a for >16mm (where ‘a’ represents thickness or relevant dimension), important for fabrication processes |
| Delivery Condition | Hot rolled, normalized, normalized + tempered, TMCP (Thermo-Mechanical Control Process) | Based on specific manufacturing and usage requirements of pressure vessels |
| Typical Applications | Manufacturing of various pressure vessels such as storage tanks for gases and liquids, boilers, and other equipment subject to internal pressure in industrial settings |
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