EN 10216-3 — Seamless steel pipes for pressure applications - Alloy fine-grained steel
Grades
P275N, P275NH, P275NL1, P275NL2, P355N, P355NH, P355NL1, P355NL2, P460N, P460NH, P460NL1, P460NL2
Chemical composition and mechanical properties
| Grade | Chemical composition | Mechanical properties |
|---|---|---|
| P275N | C≤0.18, Mn 0.50-1.40, Si≤0.40, P≤0.025, S≤0.020, Nb≤0.05, V≤0.05, Ti≤0.03, Al≥0.020, N≤0.012 | Rm 390-510 MPa, Rp0.2 ≥275, A≥24%, 20℃ Akv≥40J, Normalizing |
| P275NH | Lower P/S than P275N | Rm 390-510 MPa, Rp0.2 ≥275, A≥24%, 0℃ Akv≥40J, Normalizing |
| P275NL1 | Same as P275N | Rm 390-510 MPa, Rp0.2 ≥275, A≥24%, -40℃ Akv≥40J, Normalizing |
Application scope
EN 10216-3 specifies seamless alloy fine-grained steel pipes for pressure applications, covering grades P275N, P355N, P460N and NH, NL1, NL2, delivered in normalized or quenched and tempered condition, combining high strength with good low-temperature toughness, suitable for high-strength pressure piping and vessel connections.
Typical applications
It is mainly used in high-pressure gas cylinders, pressure vessel connections and high-strength pressure-bearing pipelines, as well as hydraulic pipes for engineering machinery and high-pressure transmission pipelines; with the high strength and good low-temperature toughness brought by fine grain strengthening, it is suitable for high-strength pressure-bearing components, connections and container parts that can withstand high internal pressure, require reliable toughness and weldability, and can safely serve in low-temperature environments.
