P275NH steel is a weldable fine-grain steel suitable for the fabrication of pressure vessels for pressurised gases and chemicals, industrial boilers, compressors and heat exchangers.
P275NH steel is intended for use in moderate to high temperature service.
Under the standard EN10028_3 , P275NH and P275NH steel plate shall be both under Normalized delivery condition when processing.These steel grade P275NH and P275N mainly used in pressure vessels and boilers differ from other carbon_manganese structural steel plates owning to its high resistance to pressure at all temperatures when usage.
Besides the Normalized,impacting test shall be done when rolling at minus 20 centi degree temperature with minimum 30J energy on transverse direction,and with minimum 45J energy on longitudinal direction.
Chemical Composition of EN 10028 P275 NH, P275 NL1 & P275 NL2
| Element | P275NH | P275NL1 | P275NL2 | Element | P275NH | P275NL1 | P275NL2 |
| Carbon (C) max. |
0.16 | 0.16 | 0.16 | Silicon (Si) max. |
0.40 | 0.40 | 0.40 |
| Manganese (Mn) | 0.80 to 1.50 | 0.80 to 1.50 | 0.80 to 1.50 | Phosphorous (P) max. | 0.025 | 0.025 | 0.020 |
| Sulphur (S) max. |
0.015 | 0.015 | 0.010 | Chromium (Cr) max. | 0.30 | 0.30 | 0.30 |
| Molybdenum (Mo) max. | 0.08 | 0.08 | 0.08 | Nickel (Ni) max. |
0.50 | 0.50 | 0.50 |
| Niobium (Nb) max. |
0.05 | 0.05 | 0.05 | Titanium (Ti) max. |
0.03 | 0.03 | 0.03 |
| Vanadium (Vi) max. | 0.05 | 0.05 | 0.05 | Nitrogen (N) max. |
0.012 | 0.012 | 0.012 |
| Aluminium (Al) min. | 0.020 | 0.020 | 0.020 | Copper (Cu) max. |
0.30 | 0.30 | 0.30 |
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