P265GH is a widely used European standard pressure vessel steel grade that is clearly specified in the EN 10028-2 standard, which governs steels for pressure-bearing applications. As a high-quality non-alloy structural steel, it boasts excellent weldability, reliable high-temperature resistance, and outstanding pressure-bearing capacity, making it an ideal material extensively employed in the manufacturing of boilers, various pressure vessels, and related industrial equipment that operate under medium temperature and pressure conditions.
Key Specifications
Material Number: 1.0425.
Designation Meaning:
P: Pressure purposes.
265: Minimum yield strength of 265 MPa (for thicknesses ≤ 16 mm).
GH: Suitable for elevated service temperatures.
Temperature Range: Suitable for continuous operation up to approx. 400°C (752°F), and up to 450°C wall temperature for piping.
Global Equivalents
USA (ASTM/ASME): ASTM A516 Grade 60 or ASTM A515.
China (GB): Q245R.
Germany (Old DIN): DIN 17155 HII.
UK (Old BS): BS 1501-161-360A.
Chemical Requirements
| C | Si | Mn | P | S | Cr | Cu | Mo | Ni |
|---|---|---|---|---|---|---|---|---|
| 0.25 max | 0.10 – 0.35 | 0.60 – 1.40 | 0.030 max | 0.030 max | 0.25 max | 0.30 max | 0.10 max | 0.30 max |
Tensile requirements
| Product thickness | Yield strength (MPA) minimum | Tensile strength (MPA) | Elongation A% minimum |
|---|---|---|---|
| up to 16mm | 265 | 410 – 530 | 22 |
| 16mm to 40mm | 255 | 410 – 530 | 22 |
| over 40mm to 60mm | 245 | 410 – 530 | 22 |
| over 60 to 100mm | 215 | 410 – 530 | 22 |
| over 100mm to 150mm | 200 | 400 – 530 | 22 |
| over 150mm to 250mm | 185 | 390 – 530 | 22 |
Impact energy values for the normalised condition.
| -20°C | 0°C | +20°C | |
|---|---|---|---|
| Transverse | 27J min | 34J min | 40J min |
Min. values for proof strength Rp0,2 (MPa) at elevated temperatures.
| Thickness | 50°C | 100°C | 150°C | 200°C | 250°C | 300°C | 350°C | 400°C |
|---|---|---|---|---|---|---|---|---|
| up to 16mm | 256 | 241 | 223 | 205 | 188 | 173 | 160 | 150 |
| 16mm to 40mm | 247 | 232 | 215 | 197 | 181 | 166 | 154 | 145 |
| over 40mm to 60mm | 237 | 223 | 206 | 190 | 174 | 160 | 148 | 139 |
| over 60mm to 100mm | 208 | 196 | 181 | 167 | 153 | 140 | 130 | 122 |
| over 100mm to 150mm | 193 | 182 | 169 | 155 | 142 | 130 | 121 | 114 |
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.
Advantages of P265GH
Excellent High-Temperature Performance: Possesses outstanding heat resistance and creep resistance, capable of long-term stable operation at 400-550°C. It maintains good mechanical properties under high-temperature and high-pressure conditions, not easily deformed or cracked, fully meeting the operating requirements of boilers and pressure vessels.
Superior Mechanical Properties: Has a minimum yield strength of 265 MPa at room temperature, with good toughness and ductility. Low phosphorus and sulfur content ensures high material purity, reducing the risk of brittle fracture and improving overall structural reliability.
Good Processability: Easy to carry out welding, forming, machining and other processes. Compatible with various common welding methods; both hot and cold forming are feasible, with simple post-processing heat treatment, reducing production difficulty and cost.
Wide Applicability & Standard Compliance: Complies with European EN standards, with stable quality and uniform performance. Suitable for multiple fields such as power generation, petrochemical, and heat exchange, featuring strong versatility and high cost-effectiveness.
Good Corrosion Resistance: Resists corrosion from high-temperature steam, common chemical media and H₂S (under specific conditions), extending the service life of equipment and reducing maintenance costs.
Why Choose Us :
You can get the perfect material according to your requirement at the least possible price.
We also offer Reworks, FOB, CFR, CIF, and door to door delivery prices. We suggest you to do deal for shipping which will be quite economical.
The materials we provide are completely verifiable, right from raw material test certificate to the final dimensional statement.(Reports will show on requirement)
We guarantee to give a response within 24hours(usually in the same hour)
You can get stock alternatives, mill deliveries with minimizing manufacturing time.
We are fully dedicated to our customers. If it will not possible to meet your requirements after examining all options, we will not mislead you by making false promises which will create good customer relations.
Contact us at beam@gneesteelgroup.com for pricing, technical support, or customized solutions. We are always ready to support your project.
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.
Can P265GH be machined easily?
P265GH has good machinability. It can be processed by turning, milling, drilling and other common machining methods. Proper cutting tools and parameters are recommended to ensure machining accuracy and surface quality.
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 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.
Is P265GH equivalent to ASTM A106 Grade B?
They are not fully equivalent. Both are pressure vessel steels, but P265GH (EN standard) has higher yield strength and better high-temperature performance than ASTM A106 Grade B (ASTM standard), and their chemical compositions also differ slightly.
Can P265GH be used in petrochemical reactors?
Yes, P265GH is suitable for low-to-medium pressure petrochemical reactors working at 400°C or below. It can withstand the pressure and temperature of common petrochemical media, but must meet strict quality control during manufacturing.
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 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).