GNEE GROUP

P355GH and P355NH are both steel grades for pressure vessel applications, but they have some key differences:

What is P355GH Steel?

• P355GH is a non-alloy quality steel with specified elevated temperature properties, typically used in high-temperature industrial applications.
• It is primarily used for pressure vessels and boilers operating at moderate to high temperatures.
• P355GH is normalized fine-grain steel with good weldability and excellent toughness.

What is P355NH Steel?

• P355NH is a normalized fine-grain steel with specified low-temperature properties, designed for use in low-temperature pressure vessel applications.
• It offers good impact toughness at low temperatures, making it suitable for cryogenic applications.
• P355NH has enhanced strength compared to P355GH due to its normalized condition.

The Chemical composition of P355GH and P355NH steel:

P355GH steel, material number 1.0473, C: 0.10-0.22, Si≤0.60, Mn: 1.10-1.70, P≤0.025, S≤0.015, Al all ≥0.020, N≤0.012 d, Cr≤0.30, Cu≤0.30, Mo ≤0.08, Nb≤0.020, Ni≤0.30, Ti≤0.03, V≤0.02, Nb+Ti+ V≤0.70

P355NH steel, material number 1.0565, C≤0.18, Si≤0.50, Mn: 1.10-1.70, P≤0.025, S≤0.015, Al all ≥0.020 c, N≤0.012 d, Cr≤0.30 e, Cu≤0.30 e, Mo≤0.08 e, Nb≤0.05, Ni≤0.05, Ti≤0.03, V≤0.10, Nb+Ti+ V≤0.12