What are difference between P295GH and P355GH steel plate?

Dec 10, 2025 Legg igjen en beskjed

P295GH and P355GH are normalized, non-alloy steel plates from the EN 10028-2 standard, primarily used for boilers, pressure vessels, and heat exchangers due to their excellent weldability and properties at elevated temperatures. The key difference lies in their strength: P295GH offers a minimum yield strength around 295 MPa (depending on thickness), while P355GH is stronger, typically featuring a minimum yield strength of 355 MPa (also varying with thickness), making it suitable for more demanding high-pressure applications.

P295GH Chemical Composition

	C			P	S		N
P295GH	0.08-0.20	0.40	0.80-1.50	0.025	0.015	0.020	0.012
							V
	0.30	0.30	0.08	0.020	0.30	0.03	0.02

Carbon Equivalent: Ceq=【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%

P355GH Chemical Composition

	C			P	S		N
P355GH	0.10-0.22	0.60	1.10-1.70	0.025	0.015	0.020	0.012
							V
	0.30	0.30	0.08	0.040	0.30	0.03	0.02

		P295GH

P295GH					-20°	0°	+20°
	≤ 16	295	460-580	21	27	34	40
	16> to ≤40	290	460-580	21	27	34	40
	40> to ≤60	285	460-580	21	27	34	40
	60> to ≤100	260	460-580	21	27	34	40
	100> to ≤150	235	440-570	21	27	34	40
	150> to ≤250	220	430-570	21	27	34	40

		P355GH Mechanical Property

P355GH					-20°	0°	+20°
	≤ 16	355	510-650	20	27	34	40
	16> to ≤40	345	510-650	20	27	34	40
	40> to ≤60	335	510-650	20	27	34	40
	60> to ≤100	315	490-630	20	27	34	40
	100> to ≤150	295	480-630	20	27	34	40
	150> to ≤250	280	470-630	20	27	34	40

P295GH: 295 MPa (for thicknesses ≤ 16mm).

P355GH: 355 MPa (for thicknesses ≤ 16mm).

P295GH: 460-580 MPa.

P355GH: 510-650 MPa (for thicknesses ≤ 60mm).

: Both are used in boilers, pressure vessels, and heat exchangers, but P355GH's higher strength makes it more suitable for high-pressure/high-stress situations, often considered the more common choice.

: The numbers "295" and "355" directly correspond to the minimum guaranteed yield strength in MPa for the base thickness.

: P355GH often requires normalized heat treatment for its specified properties.

P355GH for higher strength and pressure resistanceP295GH for lower strength requirements, with P355GH generally being the stronger, more frequently used material in high-performance pressure equipment.