P355GH steel is a widely used pressure vessel material under the EN 10028-2 standard, specifically designed for high-temperature service environments such as boilers, heat exchangers, and industrial pressure systems.
P355GH steel
As a professional steel supplier, we provide high-quality P355GH steel plates with stable mechanical properties, excellent weldability, and reliable creep resistance, making them an ideal solution for pressurized equipment operating up to 400°C.
What is P355GH Steel?
P355GH is a non-alloy steel grade intended for pressure purposes at elevated temperatures. In its designation, "P" stands for pressure applications, while "355" represents the minimum yield strength of 355 MPa. The suffix "GH" indicates suitability for high-temperature service.
This material is typically supplied in the normalized condition (N), which ensures a refined grain structure, improved toughness, and consistent performance across various industrial applications.
Due to its balanced composition and mechanical properties, P355GH steel is widely adopted in industries requiring safe and efficient operation under pressure and heat.
Chemical Composition of P355GH Steel
The chemical composition of P355GH steel is carefully controlled to achieve optimal strength, weldability, and resistance to high-temperature deformation.
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.20 |
| Silicon (Si) | ≤ 0.40 |
| Manganese (Mn) | 1.00 – 1.70 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.015 |
This composition ensures that the material maintains structural integrity while also being easy to weld and fabricate.
Mechanical Properties of P355GH Steel
P355GH steel offers excellent mechanical performance, particularly in high-pressure and elevated temperature environments.
| Property | Value |
|---|---|
| Yield Strength | ≥ 355 MPa |
| Tensile Strength | 470 – 630 MPa |
| Elongation | ≥ 22% |
These properties allow P355GH steel plates to withstand demanding operational conditions while maintaining safety and durability over long service periods.
Key Features of P355GH Steel
One of the main advantages of P355GH steel is its combination of strength and thermal stability. It provides excellent weldability, making it suitable for complex fabrication processes without compromising performance.
In addition, the material exhibits good creep resistance, allowing it to maintain strength under prolonged exposure to temperatures around 400°C.
Another important feature is its versatility. P355GH steel performs well in both high and low temperature environments, ensuring reliability across a wide range of industrial conditions. The normalized supply condition further enhances its mechanical consistency and structural stability.
Applications of P355GH Steel
Due to its outstanding properties, P355GH steel is widely used in various industrial sectors. It is commonly applied in the manufacturing of boilers and pressure vessels, where resistance to heat and pressure is critical. In the petrochemical industry, P355GH steel is used for reactors, storage tanks, and heat exchangers that handle high-temperature fluids.
Additionally, it is suitable for pipelines that transport hot liquids, as well as components in power plants and energy systems. Its ability to perform reliably under both pressure and temperature makes it a preferred material for engineers and project designers.
P355GH vs P265GH Steel
When selecting pressure vessel materials, P355GH is often compared with P265GH. The key difference lies in their strength levels.
| Grade | Yield Strength | Typical Use |
|---|---|---|
| P265GH | ≥ 265 MPa | Medium pressure applications |
| P355GH | ≥ 355 MPa | High pressure and high temperature applications |
Compared with P265GH, P355GH steel provides higher strength and better performance in more demanding environments, making it more suitable for critical industrial systems.
P355GH steel plates are typically supplied in the normalized condition, which improves toughness and ensures uniform microstructure. The material is also suitable for common processing methods such as welding, cutting, and forming, making it highly adaptable for customized engineering projects.
As a reliable material for high-temperature pressure applications, P355GH steel offers an excellent balance of strength, weldability, and thermal resistance. It is an ideal choice for boilers, pressure vessels, and industrial piping systems that require long-term performance and safety.
If you are looking for a professional P355GH steel plate supplier, we can provide competitive pricing, fast delivery, and customized processing services. Contact us today to get a quote and technical support for your project.
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What is P355GH material?
Steel for heat-resistant pressure vessels. P355GH steel gives optimum performance for pressurised products that must support a creep limit greater than 180N/mm2 at 400ºC. These types of steel are characterised by good weldability.
What is P355GH material equivalent to?
Notes: The BS EN 10028-2 P355GH steel plate is closely equivalent to ASTM A516 GR 70 and ASME SA 516 GR 70, particularly for pressure vessel applications, with P355GH offering slightly higher yield strength and stricter sulfur control for HIC resistance.
What is the difference between P355GH and P355NH?
P355GH steel is used worldwide by fabricators of welded pressure vessels, industrial boilers and heat exchangers and is engineered to work well in elevated temperature service. P355NH steel is normalized weldable fine grain steel flats under EN 10028-3: 2009 standard.
What is the yield strength of P355GH?
Carbon steels that are characterised by a greater resistance to pressure, capable of bearing significant pressure both at high and low temperatures. The yield strength ranges between 315 and 355 MPa, according to the range of thicknesses and its tensile strength goes from 510 to 650 MPa.
What is P355GH equivalent to ASTM material?
P355GH pressure vessel steel is an equivalent to ASTM A516 Grade 70 and ASME SA516 Grade 70.