EN 10216-3 (低温级) — Seamless steel pipes for pressure applications - Alloy fine-grained steel (low-temperature grade)
Grades
P275NL1, P275NL2, P355NL1, P355NL2, P460NL1, P460NL2
Chemical composition and mechanical properties
| Grade | Chemical composition | Mechanical properties |
|---|---|---|
| P275NL1 | Same as P275N | Rm 390-510 MPa, Rp0.2 ≥275, A≥24%, -40℃ Akv≥40J, Normalizing |
| P275NL2 | Lower P/S than P275N | Rm 390-510 MPa, Rp0.2 ≥275, A≥24%, -50℃ Akv≥40J, Normalizing |
| P355NL1 | Same as P355N | Rm 490-610 MPa, Rp0.2 ≥355, A≥22%, -40℃ Akv≥40J, Normalizing |
Application scope
EN 10216-3 (Cryogenic Grade) specifies seamless alloy fine-grained steel pipes for cryogenic pressure applications, including NL series grades such as P275NL, P355NL, and P460NL. The grain is refined to ensure low-temperature impact toughness, and they are widely used in high-strength cryogenic pressure applications, storage tank connections, and cryogenic process pipelines.
Typical applications
Primarily used for cryogenic high-pressure gas cylinders, cryogenic pressure vessel connections, and cryogenic high-strength pressure-bearing pipelines, as well as cryogenic process pipelines and equipment connections and gathering and transmission pipelines, NL series fine-grained steel combines high strength with low-temperature toughness, making it suitable for seamless welded pressure-bearing transmission pipelines and connecting components under cryogenic and high-pressure conditions, ensuring safe operation in high-pressure cryogenic environments.
