P355NL1 is a European standard (EN 10028-3) material grade, which is a pressure vessel steel designed for use at low temperatures. The "P" indicates it is intended for pressure purposes, "355" is the minimum yield strength in MPa, "NL" indicates it is suitable for low temperatures, and "1" indicates the material's specific impact energy and testing temperature.
Carbon (C): 0.18% max
Manganese (Mn): 1.10-1.70%
Silicon (Si): 0.50% max
Phosphorus (P): 0.025% max
Sulfur (S): 0.015% max
Nitrogen (N): 0.012% max
Copper (Cu): 0.30% max
Chromium (Cr): 0.30% max
Nickel (Ni): 0.50% max
Molybdenum (Mo): 0.08% max
Yield Strength: 355 MPa (for thicknesses ≤ 16mm)
Tensile Strength: 490-630 MPa
Elongation: 22% minimum (in 50 mm gauge length)
Impact Energy: 27 Joules minimum at -50°C
Low-Temperature Resistance: P355NL1 is specifically designed for low-temperature applications, with good notch toughness at temperatures as low as -50°C.
Weldability: The steel exhibits good weldability, making it suitable for welding processes without the need for preheating.
High Yield Strength: The high yield strength of 355 MPa ensures the material can withstand high pressures.
Pressure Vessels: Commonly used in the manufacture of pressure vessels operating at low temperatures.
Cryogenic Tanks: Suitable for storage tanks for liquefied gases at low temperatures.
Boilers: Used in boilers that operate at low temperatures.
Heat Exchangers: Suitable for heat exchangers in low-temperature environments.
P355NL1 is a versatile low-temperature pressure vessel steel with excellent weldability, high yield strength, and good notch toughness. It is ideal for applications in pressure vessels, cryogenic tanks, boilers, and heat exchangers, particularly in environments where low temperatures are a critical factor.
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