P295GH is a widely recognized European standard pressure vessel steel grade that is explicitly specified in the EN 10028-2 standard, which governs the technical requirements for steels used in pressure-bearing equipment. As a premium carbon-manganese steel, it boasts excellent weldability that allows for various welding processes without excessive preheating, superior high-temperature resistance to maintain structural stability under continuous high-temperature operation, and remarkable toughness to resist brittle fracture. These outstanding comprehensive properties make it a preferred material in the manufacturing of pressure vessels, boilers, and related pressure-bearing components across multiple industrial fields.
Chemical Composition:
| Standard | C | Mn | Si | P | S | Cr | Mo | Ni | V | Nb | Ti | Al | Cu | N |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EN | 0.08 - 0.20 | 0.9 - 1.5 | <0.4 | <0.025 | <0.015 | <0.3 | <0.08 | <0.3 | <0.02 | <0.02 | <0.03 | >0.02 | <0.3 | <0.012 |
| ISO | <0.2 | 0.9 - 1.5 | <0.4 | <0.035 | <0.030 | <0.3 | <0.08 | <0.3 | - | - | - | >0.02 | <0.3 | - |
Mechanical properties:
| Nominal thickness (mm): | to 100 | 100 - 150 | 150 - 250 |
| Rm - Tensile strength (MPa) (+N) | 460-580 | 440-570 | 430-570 |
| Nominal thickness (mm): | to 16 | 16 - 40 | 40 - 60 | 60 - 100 | 100 - 150 | 150 - 250 |
| ReH - Minimum yield strength (MPa) (+N) | 295 | 290 | 285 | 260 | 235 | 220 |
| KV - Impact energy (J) transverse, (+N) | -20° 27 |
0° 34 |
+20° 40 |
| KV - Impact energy (J) longitud., | 0° 40 |
+20° 47 |
| A - Min. elongation at fracture (%) (+N) | 21-22 |
P295GH Process Characteristics
Excellent Hot Workability: It has good plasticity and toughness in the hot working temperature range (1100-1200℃), easy to shape via rolling, forging and hot bending. The process window is wide, not easy to crack, and only needs natural cooling after processing, with low post-processing difficulty.
Stable Weldability: Low carbon equivalent ensures good weld compatibility with common welding methods. Preheating requirements are moderate (only for thick plates), and welds have high strength and toughness after processing, without obvious defects such as cracks and pores.
Controllable Cold Workability: It can withstand moderate cold deformation (≤15%) such as cold bending and stamping. Severe cold forming only needs subsequent stress relief annealing, which balances processing efficiency and product performance stability.
Simplified Heat Treatment Process: Usually delivered in normalized state, with no mandatory post-weld heat treatment. Stress relief annealing (580-620℃) is optional, with simple operation and short holding time, reducing production costs.
Versatile Cutting & Machining: Adaptable to flame, plasma and mechanical cutting. Machining is smooth with common tools, and stable surface finish can be obtained by controlling cutting parameters, suitable for mass production.
Its process characteristics are closely linked to its mechanical properties, ensuring efficient processing while guaranteeing product safety and reliability.
P295GH Advantages
As a carbon-manganese pressure vessel steel complying with EN 10028-2 standard, P295GH has significant comprehensive advantages, which lay a solid foundation for its wide application in pressure-bearing equipment and multiple industrial fields. The specific advantages are as follows:
Excellent High-Temperature Resistance and Stability: It can maintain good mechanical properties and structural stability under long-term service conditions of up to 500℃. There is no obvious attenuation of strength and toughness, which fully meets the working requirements of high-temperature pressure-bearing equipment such as boilers, steam pipelines and reactors in power, petrochemical and other industries.
Outstanding Pressure-Bearing Capacity: With a minimum yield strength of 295MPa and a tensile strength range of 410-530MPa, it has strong load-bearing capacity and deformation resistance. It can safely operate under medium and high pressure working conditions, and is suitable for manufacturing pressure vessels, storage tanks and other core pressure-bearing components that require strict pressure resistance.
Superior Weldability: The steel has low carbon equivalent and good weldability. It can be welded by common welding methods (such as manual arc welding, gas shielded welding) without obvious welding cracks. For thick plates, only appropriate preheating (100-150℃) is needed to ensure the quality of welds, which reduces the difficulty of processing and manufacturing and improves production efficiency.
Good Low-Temperature Toughness: It still maintains excellent toughness in low-temperature environments. The impact energy reaches at least 34J at 0℃, and even at -20℃, the impact energy can be kept above 27J. It avoids brittle fracture risks in low-temperature working scenarios, such as outdoor pressure equipment in cold regions.
Reliable Process Performance: It has good hot working and cold forming performance, and can be processed into various structural parts through hot rolling, normalization, bending, stamping and other processes. The finished products have uniform structure and stable performance, which can meet the diverse processing needs of different industrial equipment.
Cost-Effective and Wide Applicability: Compared with high-alloy pressure vessel steels, P295GH has lower production and use costs while meeting basic pressure and temperature resistance requirements. It is widely applicable to petrochemical, power, metallurgy, nuclear and other industries, and has high economic and practical value.
Strict Quality Control and Safety Compliance: The production process of P295GH is strictly in line with international standards, and it needs to go through strict quality inspection (such as ultrasonic testing, magnetic particle testing) before leaving the factory. It has stable quality and high safety, which can ensure the long-term safe and reliable operation of key equipment.
If you have project requirements for P295GH, we welcome your inquiry. GNEE maintains a large inventory of commonly used high strength steel grades for your selection.For detailed mechanical properties, chemical composition, and technical data, as well as free samples, please contact our factory immediately. We offer competitive prices, stable quality, and professional service. Email:beam@gneesteelgroup.com.
What is the tensile strength of P295GH at high temperature?
At 400℃, the tensile strength of P295GH is about 380-550 MPa, which is lower than room temperature but still maintains sufficient strength for high-temperature pressure-bearing applications. The value decreases with increasing temperature.
What are the delivery conditions of P295GH?
P295GH is usually delivered in the normalized state (EN 10028-2: N). The delivery includes quality certificates with chemical composition, mechanical properties, heat treatment records and non-destructive testing results.
Can P295GH be machined easily?
Yes, P295GH has good machinability due to its moderate hardness and uniform structure. Common machining methods like turning, milling, drilling and planing can be used with ordinary cutting tools and parameters.
What is the coefficient of thermal expansion of P295GH?
The linear thermal expansion coefficient of P295GH is about 11.8×10⁻⁶/℃ (20-100℃). This parameter is crucial for thermal stress calculation and structural design of equipment working under temperature changes.
Is P295GH a alloy steel or non-alloy steel?
P295GH is a non-alloy carbon-manganese steel. It does not contain a large amount of alloying elements (Cr, Ni, Mo, etc.) beyond the specified limits, and its performance is mainly ensured by carbon and manganese.
What is the minimum impact energy requirement for P295GH?
The minimum impact energy (KV) of P295GH at 20℃ is 30 J (tested with V-notch specimens). For special requirements, higher impact energy can be specified when ordering, and testing at lower temperatures is available.
Can P295GH be used in petrochemical pressure vessels?
Yes, P295GH is widely used in petrochemical pressure vessels, such as storage tanks, reactors and separators. It can withstand the pressure and temperature of petrochemical media and has good compatibility with most organic media.
What is the difference between P295GH and Q245R (Chinese standard)?
Q245R is a Chinese pressure vessel steel (GB 713), while P295GH is European standard. P295GH has higher yield strength (≥295 MPa vs ≥245 MPa) and better high-temperature performance, suitable for more demanding scenarios.
Does P295GH have creep resistance?
P295GH has certain creep resistance at high temperatures (≤450℃). It can resist long-term deformation under constant high temperature and pressure, which is essential for the service life of high-temperature pressure-bearing equipment.
What precautions should be taken when storing P295GH plates?
P295GH plates should be stored in a dry, ventilated and rainproof warehouse to avoid moisture and rust. They should be stacked neatly with pads between layers to prevent deformation and damage to the surface.