Q345R / P355GH Steel Plate for Boiler and Pressure Vessel Thickness 8.0 - 100mm

Q345R / P355GH Steel Plate for Boiler and Pressure Vessel Thickness 8.0 - 100mm

P355GH steel plate (European standard pressure vessel steel)
Standard: EN 10028-2 (European Standard for Steel Plates for pressure vessels)
Type: Non-alloy fine grain steel, suitable for high temperature pressure vessels

1. Chemical composition (%)
Elements (or less) Si (or less) Mn P C (or less) S (or less) Al (or greater) Nb/V/Ti (optional)
Range 0.20 0.40 1.00-1.60 0.025 0.015 0.020 can be microalloyed
Carbon equivalent (CET) : ≤0.43 (improve welding performance)

2. Mechanical properties

• Parameter Yield strength (MPa) Tensile strength (MPa) Elongation (%) Impact power (J, -20°C)
• Requirements ≥355 470-630 ≥20 ≥40 (transverse sample)
• High temperature performance:
• Design temperature range: -20°C ~ +400°C
• High temperature yield strength (high strength at 300°C)

Step 3: Characteristics
✅ High strength: yield strength ≥355 MPa, suitable for medium and high pressure vessels.
✅ Good weldability: low C, P, S content, low carbon equivalent (CET), suitable for applications without heat treatment after welding.
✅ High temperature stability: can be used for a long time below 400°C.
✅ Low temperature toughness: -20°C impact power ≥40J, suitable for low temperature environment.
✅ Fine grain structure: Al or Nb/V/Ti microalloying refines grains to improve strength and toughness.

4. Specifications (common sizes)

• Thickness: 8~ 120mm (thicker specifications require special agreement)
• Width: 1500~4500 mm
• Length: 6000 to 18000 mm
• Delivery status: Normalizing (+N) or thermo-mechanical rolling (+M)

5. Main applications
P355GH is widely used in the manufacture of high temperature and pressure resistant welded pressure vessels, such as:

Petrochemical: reactor, heat exchanger, storage tank

Energy industry: boiler drum, nuclear power equipment

Food/Pharmaceutical: high temperature sterilized containers

Marine/Marine Engineering: LNG storage tanks, compressed air tanks

6. Compare Q345R (Chinese standard)

• Parameter P355GH (EN) Q345R (GB 713)
• Standard EN 10028-2 GB 713
• Yield strength ≥355 MPa ≥345 MPa
• Tensile strength 470-630 MPa 510-640 MPa
• Impact temperature -20°C -20°C (or 0°C)
• Carbon equivalent ≤0.43 ≤0.48

Main uses European standard pressure vessel National standard pressure vessel
P355GH more stringent: more strict control of P and S content, higher impact work requirements, suitable for export or EU projects.

P355GH is commonly used in Europe pressure vessel steel plate, high strength, good weldability, high temperature resistance, suitable for chemical industry, energy and other industries. Similar to China's Q345R, but P355GH is better in impurity control and impact toughness, in line with EU standards. If you need to replace the Q345R, you need to evaluate the specific conditions (e.g. temperature, pressure, welding requirements).