P265GH | Pressure Vessel Steel
P265GH | Pressure Vessel Steel
P265GH is a carbon steel for pressure vessels and boilers, with “P” for pressure and “265” for 265 MPa minimum yield strength. “GH” indicates high-temperature use under the EN 10028-2:2009 standard. Equivalent grades are Q245R, ASTM A516 Gr.60, A515, and 1.0425. It offers good weldability and is widely used in power generation and oil industries.
We follow the EN 10028-2 standard, offering P235/265/295/355GH products (such as tubes) in 6–150 mm thicknesses, 900–4800 mm widths, and 3000–25000 mm lengths.
Description
What is P265GH?
P265GH is a non-alloy carbon steel consisting of approximately 98% iron, 0.16-0.20% carbon, along with small amounts of manganese (0.7-1.4%), silicon (≤0.40%), phosphorus (≤0.025%), and sulfur (≤0.015%). It’s a solid grey steel used in pressure vessels and boilers, known for weldability and heat resistance. Hot-rolled, it belongs to pressure vessel steels and is widely used in the power, oil, and gas industries.Characteristics of P265GH Steel
P265GH is a carbon steel known for its excellent weldability, high-temperature resistance, good mechanical strength, and cold-bending performance. It performs well under pressure, making it ideal for boilers, pressure vessels, and heat exchangers. Its durability and resistance to moderate corrosion make it suitable for the power generation, oil, and gas industries. Alternatives like P355GH, 16Mo3, or 13CrMo4-5 may be more appropriate if higher strength or better corrosion resistance is needed.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 |
Machining
P265GH Heat Treatment
- Normalizing:
- Heat to 890-950°C (1634-1742°F).
- Hold at this temperature until fully austenitized, then air cool.
- Effect: Refines grain structure, increases tensile strength and hardness, and improves toughness.
- Annealing:
- Heat to 650-700°C (1202-1292°F).
- Hold for sufficient time, then slowly cool in the furnace.
- Effect: Reduces hardness, improves ductility, and relieves internal stresses.
- Stress Relieving:
- Heat to 600-650°C (1112-1202°F).
- Hold at this temperature for 1-2 hours, then air cool.
- Effect: Relieves internal stresses from welding or forming, improves dimensional stability.
- Tempering:
-
- Heat to 500-600°C (932-1112°F).
- Hold for an appropriate amount of time, then air cool.
- Effect: Reduces brittleness after welding or heat treatment, improving toughness.
-
P265GH Surface Finish
Disclaimer
The above heat treatment instructions and surface finish processing methods for P265GH steel are provided for informational purposes only. Actual results may vary based on specific conditions and equipment used. Testing is recommended, and a metallurgical expert or material supplier should be consulted to ensure the processes are suitable for your specific application. The user assumes all risks and liability for the use of this information.
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