P265GH is a widely adopted European standard pressure vessel steel grade, explicitly specified in EN 10028-2-a standard governing steels for pressure-bearing applications. As a high-quality non-alloy structural steel, it features excellent weldability, reliable high-temperature resistance, and superior pressure-bearing capacity, rendering it an ideal material extensively utilized in manufacturing boilers, various pressure vessels, and related industrial equipment operating under medium-temperature and medium-pressure conditions.
Chemical Compositions
| Element | Content (%) |
|---|
| Iron, Fe | ~98 |
| Carbon, C | 0.16-0.20 |
| Manganese, Mn | 0.70-1.40 |
| Silicon, Si | ≤ 0.40 |
| Phosphorus, P | ≤ 0.025 |
| Sulfur, S | ≤ 0.015 |
Physical Properties
| Physical Property | Metric | Imperial |
|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Melting Point | 1420-1460 °C | 2588-2660 °F |
| Boiling Point | Not available | Not available |
| Thermal Conductivity | 51 W/m·K | 354 BTU·in/(hr·ft²·°F) |
| Electrical Conductivity | ~10.7 MS/m | ~10.7 MS/m |
| Specific Heat Capacity | 480 J/kg·K | 0.114 Btu/lb·°F |
| Thermal Expansion Coefficient | 12.5 × 10⁻⁶ /K | 6.94 × 10⁻⁶ /°F |
| Electrical Resistivity | ~0.093 Ω·mm²/m | ~0.093 Ω·mm²/m |
Mechanical Properties
| Mechanical Property | Metric | Imperial |
|---|
| Tensile Strength | 410-530 MPa | 59.5-76.9 ksi |
| Yield Strength | 265 MPa | 38.4 ksi |
| Brinell Hardness | ~130 HB | ~130 HB |
| Rockwell Hardness | ~73 HRB | ~73 HRB |
| Vickers Hardness | ~131 HV | ~131 HV |
| Elongation | 23-25% | 23-25% |
| Elastic Modulus | 210 GPa | 30,500 ksi |
| Impact Energy | 27 J at 20°C | 19.9 ft·lbf at 68°F |
Data After Normalizing Processing
| Mechanical Property (Normalized) | Metric | Imperial |
|---|
| Tensile Strength | 440-570 MPa | 63.8-82.7 ksi |
| Yield Strength | 275 MPa | 39.9 ksi |
| Brinell Hardness | ~150 HB | ~150 HB |
| Rockwell Hardness | ~78 HRB | ~78 HRB |
| Vickers Hardness | ~150 HV | ~150 HV |
| Elongation | 22-24% | 22-24% |
| Elastic Modulus | 210 GPa | 30,500 ksi |
| Impact Energy | 30 J at 20°C | 22.1 ft·lbf at 68°F |
Industries & Applications
| Industries | Products |
|---|
| Power Generation | Boilers, Heat Exchangers, Steam Drums, Pressure Vessels, Turbines |
| Oil and Gas | Pipeline Systems, Storage Tanks, Heat Exchangers, Refinery Vessels, Separators |
| Chemical Processing | Reactors, Distillation Columns, Heat Exchangers, Pressure Vessels, Storage Tanks |
| Petrochemical Industry | Refinery Equipment, Boilers, Heat Exchangers, Storage Vessels, Pressure Cylinders |
| Manufacturing | Boilers, Autoclaves, Pressure Vessels, Industrial Ovens, Heat Treatment Furnaces |
| Energy and Utilities | Heat Exchangers, Pressure Vessels, Steam Turbines, Water Heaters, Storage Tanks |
P265GH Processing
Welding: Suitable for common welding methods like arc welding, gas shielded welding and submerged arc welding. Preheat to 80-150°C to prevent cold cracks; post-weld heat treatment (600-650°C) is recommended for thick workpieces to reduce residual stress. Welding consumables should match its mechanical properties, complying with EN standards.
Forming: Can be hot-formed and cold-formed. Hot forming temperature ranges 900-1100°C, with slow cooling after forming to maintain toughness. Cold forming (e.g., bending, stamping) is feasible at room temperature, but avoid excessive deformation; stress relief annealing may be needed afterward.
Machining: Features good machinability. Use high-speed steel or cemented carbide tools. Adopt moderate cutting speed and feed rate; ensure sufficient cooling with cutting fluid to prevent overheating and material hardening, which may affect machining accuracy and tool life.
Heat Treatment: Delivery status is usually normalized (890-950°C, air cooling) or normalized+tempered. Post-processing heat treatment should avoid overheating, and strictly control temperature and holding time to ensure stable material performance without reducing pressure-bearing capacity.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
What is the Poisson's ratio of P265GH?
The Poisson's ratio of P265GH at room temperature is approximately 0.29-0.30, a key parameter for elastic deformation calculation in structural design, reflecting the ratio of lateral strain to axial strain under stress.
What is the application limit of P265GH?
P265GH is not suitable for high-temperature (above 450°C), low-temperature (below 0°C for long-term use) or strong corrosive environments. It also cannot be used in equipment with extremely high pressure (exceeding its pressure-bearing capacity based on thickness and temperature).
What is the tensile strength of P265GH at high temperatures?
At 300°C, the tensile strength of P265GH is about 380-500 MPa, and at 400°C, it decreases to around 340-460 MPa. High-temperature tensile strength is a key index for high-temperature equipment design.
What is the impact energy requirement of P265GH?
P265GH requires a minimum impact energy of 27 J at 20°C (Charpy V-notch test). For low-temperature applications, impact testing at lower temperatures (such as 0°C or -20°C) may be required with higher energy values.
How to store P265GH plates?
P265GH plates should be stored in a dry, well-ventilated warehouse to avoid moisture and corrosion. They should be placed on wooden pallets away from the ground, and covered with waterproof cloth to prevent rain and dust contamination.
What are the delivery conditions of P265GH?
P265GH is usually delivered in the normalized state (N), with mandatory inspection of chemical composition, mechanical properties and surface quality. Customers can also request additional tests (such as impact testing) as needed.
Can P265GH be forged?
Yes, P265GH has good forgeability. Forging is usually performed at 1100-1250°C, followed by proper heat treatment (normalization) to refine grains, improve mechanical properties and eliminate forging defects.
Is P265GH suitable for steam boiler tubes?
Yes, P265GH is widely used for steam boiler tubes. Its good high-temperature resistance, pressure-bearing capacity and weldability meet the working requirements of steam boilers (medium temperature and pressure steam transmission).
What is the hardness of P265GH?
The Brinell hardness (HB) of P265GH in the normalized state is generally ≤187 HB. Hardness testing is a quick way to evaluate its mechanical properties, reflecting the material's resistance to indentation.
What is the thermal conductivity of P265GH?
The thermal conductivity of P265GH at room temperature is about 45-50 W/(m·K), which decreases slightly with increasing temperature. This property is essential for heat transfer calculation in boiler and heat exchanger design.