P355NL is a European steel grade specified under EN 10028-3, primarily used in pressure vessel and boiler applications that require materials to operate under low temperatures. The "P" indicates it is intended for pressure purposes, "NL" signifies it has been normalized and is suitable for low-temperature applications, and the "355" denotes its minimum yield strength in megapascals (MPa).
Chemical Composition:
Carbon (C): Max 0.18–0.22%
Silicon (Si): Max 0.50%
Manganese (Mn): 1.10–1.70%
Phosphorus (P): Max 0.025%
Sulfur (S): Max 0.015%
Nickel (Ni), Chromium (Cr), Copper (Cu): Trace elements allowed but regulated for toughness and corrosion resistance.
Mechanical Properties:
Yield Strength: Minimum of 355 MPa for thicknesses up to 16mm.
Tensile Strength: 490–630 MPa.
Impact Toughness: Tested at -50°C, making it ideal for cold-temperature resilience.
Weldability:
P355NL steel has good weldability due to its low carbon equivalent, enabling it to be welded without preheating, depending on thickness and application. This property is crucial for constructing large welded structures.
Applications:
It is commonly used in the fabrication of boilers, pressure vessels, and storage tanks, especially where low-temperature toughness is needed, such as in chemical, oil, and gas industries.
P355NL is often compared to similar grades like ASTM A516 Grade 70 or A537 Class 1 for applications requiring both strength and toughness under low temperatures. Its combination of mechanical properties, weldability, and temperature resilience make it a reliable choice for high-stress environments.
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