P235GH and P265GH are both non-alloy steels for pressure vessels, but P265GH has higher strength, with a minimum yield strength of 265 MPa, versus P235GH's 235 MPa, making it suitable for higher-pressure applications, while P235GH offers better weldability and elongation due to slightly lower carbon content (around 0.16% vs. P265GH's ~0.20%). Both share similar high-temperature uses but differ in strength, with P265GH being the stronger, "higher-grade" choice for demanding conditions.
Chemical Composition
Mechanical Properties
P235GH: Has a minimum yield strength of 235 MPa, making it suitable for moderate-pressure applications. Its tensile strength ranges between 360-500 MPa.
P265GH: Offers a higher yield strength of 265 MPa and a tensile strength of 410-570 MPa, providing better performance in higher-pressure environments.
Equivalent Standards
Applications
P235GH:
Due to its excellent weldability and moderate strength, P235GH is commonly used in:
Heat exchangers
Low-pressure boilers
Pipeline systems for fluids or gases with lower pressure and temperature requirements
P265GH:
With its superior strength, P265GH is ideal for more demanding applications, such as:
High-pressure steam boilers
Pressure vessels
Industrial pipelines carrying high-temperature fluids
Weldability and Fabrication
P235GH: Easier to weld due to its lower carbon content, making it a preferred choice for projects where welding is frequent.
P265GH: Still weldable but may require preheating or other precautions due to its higher carbon equivalent.
