What is the differences between P235GH and P265GH?

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What is the differences between P235GH and P265GH?

2025-12-05

P235GH and P265GH are two non-alloy steel grades with specified elevated temperature properties that are commonly used in high-temperature applications such as boilers, pressure vessels, and heat exchangers.

Difference in Chemical Composition

Element	P235GH	P265GH	Key Difference
Carbon (C)	≤ 0.16%	≤ 0.20%	P265GH allows slightly higher carbon.
Mn (Manganese)	≤ 1.20%	≤ 1.40%	P265GH permits more Mn (strength enhancer).
P (Phosphorus)	≤ 0.025%	≤ 0.025%	Same limit.
S (Sulfur)	≤ 0.015%	≤ 0.010%	Stricter limit for P265GH (improves weldability).
Si (Silicon)	≤ 0.35%	≤ 0.40%	Comparable.

Tensile properties difference between P235GH steel and P265GH steel at room temperature.

EN10028	Thickness	Tensile properties at room temperature			Min. impact energy of Temperature ℃
Grade	mm	Yield Strength Mpa≥	Tensile Strength Mpa	Elongation % ≥	-20	0	20
P235GH	≤16	235	360～480	24	27	34	40
	16＜t≤40	225	360～480
	40＜t≤60	215	360～480
	60＜t≤100	200	360～480
	100＜t≤150	185	350～480
	150＜t≤250	170	340～480
P265GH	≤16	265	410～530	22	27	34	40
	16＜t≤40	255	410～530
	40＜t≤60	245	410～530
	60＜t≤100	215	410～530
	100＜t≤150	200	400～530
	150＜t≤250	185	390～530

P235GH and P265GH 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.

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