Pressure Vessel Steel Billet Q345B

Pressure Vessel Steel Billet Q345B - Image 3

Pressure Vessel Steel Billet Q345B

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