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P355NL2 steel is a European standard low-temperature pressure vessel steel, classified as a normalized weldable fine-grain structural plate, with the following notable characteristics:
Excellent Mechanical Properties
Yield Strength: Varies based on plate thickness. For example:
Plates 16–40 mm thick: Yield strength ≥345 MPa
Plates 40–60 mm thick: Yield strength ≥335 MPa
Tensile Strength: Ranges from 490–630 MPa, ensuring sufficient strength to withstand various loads.
Elongation: Maintains high elongation across different thicknesses. For instance, plates 16–40 mm thick exhibit elongation ≥22%, indicating good ductility.
Impact Toughness: At -50°C, longitudinal impact energy (Akv) ≥42 J and transverse impact energy (Akv) ≥27 J, demonstrating strong resistance to brittle fracture and ensuring safe use in low-temperature conditions.
Superior Workability
Cold Forming Performance: Uniform normalized microstructure enables excellent cold forming adaptability to meet diverse shape requirements.
Cutting Performance: Supports cutting, bending, edging, and other machining operations to fulfill manufacturing demands.
Recommended methods: CNC plasma or laser cutting for plates ≤20 mm thick; flame cutting for plates >30 mm thick.
Weldability: Strict carbon equivalent control allows welding without preheating (depending on thickness). Multiple welding methods—such as manual arc welding, submerged arc welding, and gas metal arc welding—can be employed, yielding high-quality welded joints.
Enhanced Corrosion Resistance
Alloying Element Effects: The addition of chromium (Cr), nickel (Ni), molybdenum (Mo), and other alloying elements improves corrosion resistance.
Application Environments: Provides reliable resistance to chemical erosion from acids, alkalis, salts, and other corrosive substances, making it suitable for diverse corrosive settings.