What are the delivery conditions of P265GH?

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.

P265GH Strength at Elevated Temperature ( Thickness wise):

P265GH Plate Chemical Composition:

Main Applications

Boiler and Steam System Components: As a core material for boilers and pressure vessels, P265GH is widely used in manufacturing boiler drums, superheater shells, and reheater tubes in thermal and nuclear power plants. It can withstand high-temperature steam erosion and pressure, ensuring stable operation of power generation equipment <superscript>1<superscript>4.

Petrochemical Equipment: It is applied to fabricate hydrogenation reactors, synthesis towers, and high-temperature cracking devices. It also suits oil and gas transmission pipelines (especially those with anti-H₂S corrosion design) and chemical distillation towers, adapting to harsh working environments with high temperature and pressure <superscript>4<superscript>7.

Heat Exchangers and Pressure Vessels: Used for making heat exchanger tube plates, separators, spherical tanks, and LNG storage tank liners. Its good toughness and pressure-bearing capacity meet the requirements of medium and low-temperature pressure vessel manufacturing <superscript>3<superscript>4.

Other Industrial Fields: It is employed in high-temperature and high-pressure pipelines of industrial furnaces, central heating system pressure components, and even structural parts of construction and engineering machinery (when low-temperature toughness requirements are met) <superscript>4<superscript>8.

Application Conditions

Temperature Range: Suitable for operating temperatures up to 400-550°C, with excellent creep resistance to avoid slow deformation under long-term high-temperature stress <superscript>1<superscript>7.

Pressure Requirement: Designed for medium and high-pressure environments, with a minimum yield strength of 265 MPa at room temperature, matching pressure-bearing scenarios in boilers and pressure vessels <superscript>1<superscript>6.

Welding and Heat Treatment: Must adopt appropriate welding processes with preheating and post-weld heat treatment if needed. Delivery status is usually hot-rolled, normalized, or normalized+tempered to ensure stable performance<superscript>5<superscript>7.

Standard Compliance: Complies with European standards EN 10028-2 and EN 10216-2, with strict control of phosphorus (≤0.025%) and sulfur (≤0.015%) content to ensure material purity and corrosion resistance <superscript>6<superscript>8.

In summary, P265GH is a cost-effective material for high-temperature and pressure-bearing scenarios, with applications closely relying on its mechanical properties and strict compliance with operating conditions.

Process Characteristics of P265GH

Welding Characteristic: It has excellent weldability, compatible with arc welding, submerged arc welding and gas shielded welding. Preheating (80-150°C) is essential to avoid cold cracks, and post-weld heat treatment (600-650°C) for thick workpieces can effectively reduce residual stress. Welding without excessive spatter ensures good joint quality, and the welded joints maintain consistent high-temperature resistance and pressure-bearing capacity with the base metal.

Forming Characteristic: Both hot and cold forming are feasible with strong adaptability. Hot forming at 900-1100°C features good plasticity, easy shaping of complex components, and slow cooling after forming to retain toughness. Cold forming at room temperature requires no high-temperature equipment, but moderate deformation is needed; stress relief annealing can eliminate internal stress without damaging material performance.

Machining Characteristic: Machinability is superior, with low cutting resistance and good chip control. It can be processed by turning, milling, drilling and other methods. Using common tools (high-speed steel, cemented carbide) with sufficient cooling fluid prevents overheating and hardening, ensuring high machining accuracy and surface finish, and reducing tool wear.

Heat Treatment Characteristic: Heat treatment process is simple and controllable. Normalized (890-950°C, air cooling) or normalized+tempered delivery status ensures stable mechanical properties. Post-processing heat treatment has a wide temperature range, not easy to cause material performance degradation, and can further optimize toughness and pressure-bearing capacity.

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What are the main chemical components of P265GH?

The main chemical components of P265GH include C (≤0.20%), Si (≤0.35%), Mn (1.00-1.60%), P (≤0.025%), S (≤0.015%), and trace elements like Ni, Cr, Mo, ensuring its structural and functional stability.

What are the typical applications of P265GH?

P265GH is widely used in manufacturing boilers, pressure vessels, heat exchangers, steam pipes and other equipment that work under medium temperature and pressure, especially in petroleum, chemical and power industries.

What is the difference between P265GH and P235GH?

The main difference lies in yield strength: P265GH has a yield strength of ≥265 MPa, while P235GH is ≥235 MPa. P265GH also has higher tensile strength, making it more suitable for equipment requiring higher pressure-bearing capacity.

Does P265GH require heat treatment?

P265GH is usually supplied in the normalized state (heat treatment at 890-950°C and air cooling). For thick-walled components or after welding, stress relief annealing may be required to eliminate internal stress and improve material toughness.

What are the mechanical properties of P265GH?

P265GH has a yield strength of ≥265 MPa (at room temperature), tensile strength of 410-530 MPa, elongation after fracture of ≥24%, and good impact toughness, suitable for bearing pressure and high-temperature environments.

Can P265GH be used in low-temperature environments?

P265GH is not specially designed for low-temperature use. Its impact toughness decreases at temperatures below 0°C. For low-temperature (-20°C or lower) applications, low-temperature pressure vessel steels like P275NL1 are more suitable.

How to inspect P265GH for defects?

Common inspection methods for P265GH include visual inspection, ultrasonic testing (UT), radiographic testing (RT), magnetic particle testing (MT) and liquid penetrant testing (PT), to detect surface and internal defects and ensure product quality.

What is the melting point of P265GH?

The melting point range of P265GH is about 1450-1500°C, similar to other carbon steels. This parameter is important for processes such as casting, forging and welding, ensuring proper temperature control during processing.

What is the density of P265GH?

The density of P265GH is approximately 7.85 g/cm³, the same as ordinary carbon steel. This value is crucial for weight calculation and structural design of equipment such as pressure vessels and pipelines.

What is the maximum operating temperature of P265GH?

The maximum continuous operating temperature of P265GH is generally around 400-450°C. Beyond this range, its mechanical properties may decrease, affecting the safety and service life of equipment made from it.