Weldable normalized P355NH steel mechanical property

P355NH steel is a kind of grade under EN10028-3, which is widely used in petroleum, chemical industry, power station, boiler, etc. It is the following mechanical properties that makes P355NH widely be applied, like the tensile strength, impact energy values for the normalized condition and the minimum values for proof strength Rp0,2 at elevated temperatures.

The tensile strength requirement of P355NH steel.

Product Thickness	Yield Strength MPa	Tensile Strength MPa	Elongation A%
up to 16 mm	355 min	490 to 630	22 min
16 to 40 mm	345 min	490 to 630	22 min
over 40 to 60 mm	335 min	490 to 630	22 min
over 60 to 100 mm	315 min	470 to 610	21 min
over 100 to 150 mm	305 min	460 to 600	21 min
over 150 to 250 mm	295 min	450 to 590	21 min

P355NH steel impact energy values for the normalized condition

	-20 OC	0 OC	+20 OC
Transverse	30 J min	40 J min	50 J min
Longitudinal	45 J min	65 J min	75 J min

P355NH steel minimum values for proof strength Rp0,2 at elevated temperatures.

Thickness	50oC	100oC	150oC	200oC	250oC	300oC	350oC	400oC
up to 16 mm	343	323	299	275	252	232	214	202
16 to 40 mm	334	314	291	267	245	225	208	196
over 40 to 60 mm	324	305	282	259	238	219	202	190
over 60 to 100 mm	305	287	265	244	224	206	190	179
over 100 to 150 mm	295	277	257	236	216	199	184	173
over 150 to 250 mm	285	268	249	228	209	192	178	167

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