P235GH and P265GH are the two most common seamless pressure pipe grades under EN 10216-2 for European pressure equipment certified under the Pressure Equipment Directive (PED) 2014/68/EU. Both are non-alloy steels with guaranteed elevated-temperature properties, but their differing yield strengths dictate distinctly different applications.
The core difference lies in minimum yield strength: P235GH delivers 235 MPa, while P265GH delivers 265 MPa — a 30 MPa advantage. This translates to tensile strength ranges of 360–500 MPa for P235GH versus 410–570 MPa for P265GH. Temperature limits also differ: P235GH is suitable up to approximately 400°C, whereas P265GH can serve at temperatures up to 500°C.
When should an engineer specify P265GH instead of P235GH? The decision hinges on design pressure, operating temperature, and stress requirements. P235GH is the cost-effective choice for moderate-pressure applications such as general pressure vessels, heat exchangers, economizers, and low-pressure boilers. P265GH, with its superior strength, is specified for more demanding service: high-pressure vessels, steam drums, headers, superheaters, and industrial pipelines carrying high-temperature fluids.
However, selecting P265GH when P235GH would suffice means paying a 5–8% premium for no benefit. Conversely, choosing P235GH when P265GH is required risks failed pressure calculations or rejected inspection. P235GH offers slightly better weldability due to lower carbon content (0.16% vs. 0.20%), while P265GH may require preheating precautions. The correct specification is therefore determined by whether the equipment must withstand higher pressures, higher temperatures, or both — if so, P265GH is the mandatory choice.
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