P355GH steel and Q345R steel are widely used for boilers, heat exchangers, and pressure vessels. As an experienced manufacturer and supplier, we provide factory-direct P355GH steel and Q345R steel plates, fully certified with EN 10028 and GB713 standards.
P355GH
This guide details the differences between P355GH and Q345R in chemical composition, mechanical properties, welding performance, corrosion resistance, and application temperature range, helping you select the right material for your project.
Standards and Applications of P355GH steel
P355GH steel: Complies with EN 10028 and is designed for high-temperature, high-pressure pressure vessels.
Q345R steel: Follows China GB713 standard, primarily for general pressure vessel applications.
Both steels are suitable for industrial pressure vessels, but the choice depends on the operating temperature and pressure requirements.
Chemical Composition Comparison of P355GH steel
| Element | P355GH (%) | Q345R (%) | Remarks |
|---|---|---|---|
| Carbon (C) | 0.10–0.22 | 0.18–0.25 | P355GH has lower carbon for better weldability |
| Manganese (Mn) | 1.10–1.70 | 0.50–1.20 | Higher in P355GH for improved high-temp strength |
| Chromium (Cr) | ≤0.30 | – | P355GH added for high-temperature corrosion resistance |
| Molybdenum (Mo) | ≤0.08 | – | Enhances high-temperature stability |
| Sulfur (S) | ≤0.015 | ≤0.035 | Both low to ensure toughness |
| Phosphorus (P) | ≤0.025 | ≤0.035 | – |
Observation: P355GH steel contains more alloying elements such as Cr, Mo, and higher Mn, giving it superior high-temperature performance and corrosion resistance compared to Q345R steel.
Mechanical Properties Comparison of P355GH steel
| Property | P355GH | Q345R | Application Suitability |
|---|---|---|---|
| Tensile Strength (MPa) | 510–650 | 470–580 | P355GH suitable for higher stress environments |
| Yield Strength (MPa) | 280–355 | 245–345 | High strength ensures pressure vessel safety at elevated temperatures |
| Elongation (%) | ≥20 | ≥19 | Both steels are ductile enough for forming |
| Impact Energy (KVJ) | ≥27 at 0–20°C | ≥27 at 0–20°C | Comparable toughness at normal temperatures |
P355GH's superior mechanical properties make it ideal for pressure vessels operating above 300°C, whereas Q345R is more suited for medium and low temperature applications.
Welding and Corrosion Performance of P355GH steel
P355GH steel: Excellent weldability with low carbon content and alloying elements; high corrosion resistance due to Cr and Mo.
Q345R steel: Good weldability; moderate corrosion resistance under normal conditions, but weaker than P355GH in high-temperature environments.
Tip: For high-temperature or highly corrosive process fluids, P355GH is recommended over Q345R.
Choosing Between P355GH and Q345R
The selection depends on operating temperature, pressure, and project standards:
Use P355GH for high-temperature boilers, heat exchangers, and chemical pressure vessels.
Use Q345R for general medium and low-temperature pressure vessels, such as storage tanks and pipelines.
Our factory supplies both P355GH and Q345R steel plates in standard and custom dimensions, complete with EN 10204 3.1/3.2 mill test certificates.
Understanding the differences between P355GH steel and Q345R steel is critical for safe and efficient pressure vessel manufacturing. Our P355GH steel plates provide high-temperature resistance, excellent mechanical properties, and full certification for industrial applications.
Contact us now to get the latest P355GH steel plate price list and ensure you select the optimal material for your engineering project.
Contact us for latest P355GH steel plate price list
Application
What is P355GH material?
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. They are used above all for manufacturing boilers, pressure vessels and pipes for the transportation of hot liquids.
What is en 10028 P355GH equivalent to?
P355GH pressure vessel steel is an equivalent to ASTM A516 Grade 70 and ASME SA516 Grade 70.
What is the difference between P355GH and P355NH?
P355GH: This steel is designed for high-temperature applications and is characterized by high strength at temperatures up to 500 °C. P355NH: This steel is designed for low-temperature applications and is characterized by high toughness at low temperatures.
What is P235gh pipe equivalent ASTM material?
P235gh grade is an alloy of European standard EN 10028-2, which is also called the A2885 grade C steel, The P235gh Equivalent Astm Material is the ASTM A285 or the A285M 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.