S355NL Impact Test at -50°C

S355NL Impact Test at -50°C

The S355NL impact test is a defining feature of this high-strength, low-alloy structural steel under EN 10025-3, ensuring its suitability for demanding low-temperature environments. The S355NL Charpy V-notch test at -50°C guarantees exceptional toughness, making it ideal for applications like offshore platforms and arctic bridges.

This article explores the S355NL temperature performance, impact test specifications, chemical composition, mechanical properties, and applications, addressing core keywords s355nl impact test, s355nl charpy, and s355nl temperature. For more details, visit our EN 10025-3 S355NL normalized structural steel plate.

What is S355NL Steel?

S355NL is a fine-grain structural steel under EN 10025-3, designed for high strength and low-temperature toughness. Its designation indicates:

• S: Structural steel.
• 355: Minimum yield strength of 355 MPa (≤16 mm).
• NL: Normalized or normalized rolled, with S355NL Charpy impact testing at -50°C.

The S355NL impact test ensures resistance to brittle fracture in sub-zero conditions, critical for structural reliability.

S355NL Impact Test at -50°C

The S355NL impact test uses the Charpy V-notch method to measure toughness at -50°C, ensuring a minimum energy absorption of 27 J (longitudinal). This test, specified in EN 10025-3, confirms S355NL’s ability to withstand impact loads in cold climates, such as arctic offshore platforms or northern wind towers. The S355NL Charpy test is conducted on standardized specimens (10x10 mm) to verify resistance to crack propagation under low temperatures.

Impact Test Specifications

• Test Temperature: -50°C.
• Minimum Energy: ≥27 J (longitudinal), ≥16 J (transverse).
• Specimen: Charpy V-notch, per EN ISO 148-1.
• Application: Ensures performance in sub-zero environments, meeting Eurocode 3 standards.

Chemical Composition Supporting Low-Temperature Toughness

The S355NL temperature performance is driven by its chemical composition, optimized for fine-grain structure and toughness:

Key Elements:

• Low Carbon (C): ≤0.18% reduces brittleness.
• Aluminum (Al), Niobium (Nb): Promote fine-grain structure, enhancing S355NL Charpy toughness.
• Low Sulfur (S) and Phosphorus (P): Minimize inclusions, improving low-temperature performance.

Carbon Equivalent (CEV): ≤0.43% (≤63 mm), calculated as CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15, ensures weldability.

Mechanical Properties Supporting Impact Performance

The S355NL mechanical properties complement its low-temperature toughness:

The S355NL impact test at -50°C ensures reliability across thicknesses up to 250 mm, supporting applications in extreme cold.

Welding and Heat Treatment

The S355NL temperature performance extends to weldability:

• Welding: Compatible with GMAW and SAW per EN 1011-2. Preheating (100-150°C) for >20 mm; no preheat for thinner plates.
• PWHT: Optional at 550-650°C for critical welds.
• Consumables: ER70S-6 (GMAW), EM12K flux with EH14 wire (SAW).

The fine-grain structure supports weld integrity in cold conditions.

Applications of S355NL

The S355NL Charpy performance at -50°C makes it ideal for:

• Offshore Platforms: Resists impact in cold marine environments.
• Wind Turbine Towers: Withstands sub-zero loads in northern climates.
• Bridges and Cranes: Load-bearing components in arctic regions.
• Pressure Vessels: Low-temperature storage systems.

Explore related grades like EN 10025-3 S420NL normalized structural steel plate.

Equivalent Grades

See EN 10025-3 S355N normalized structural steel plate.

Why Choose Gangsteel?

Gangsteel supplies S355NL:

• Inventory: Extensive stock in China.
• Sizes: Thickness 6–250 mm, widths 2000/2500/3000 mm, lengths up to 12,000 mm.
• Delivery: 7-30 days globally.
• Certifications: EN 10204 3.1/3.2, UT testing (EN 10160), ABS/LR/BV/DNV approvals.
• Processing: Cutting, welding, bending.

Contact us for EN 10025-3 S355NL normalized structural steel plate.

FAQ

What is the S355NL impact test?
The S355NL impact test is a Charpy V-notch test at -50°C, ensuring ≥27 J energy absorption (longitudinal) per EN 10025-3. It verifies toughness for sub-zero applications like offshore platforms, preventing brittle fracture under impact loads.

What does the S355NL Charpy test measure?
The S355NL Charpy V-notch test measures energy absorption (≥27 J at -50°C) to assess resistance to crack propagation in cold conditions, critical for structures like wind towers in arctic climates.

How does S355NL temperature performance work?
S355NL performs reliably from -50°C to +500°C, with guaranteed toughness at -50°C, making it suitable for extreme cold environments like northern bridges, supported by its fine-grain structure.

Is S355NL suitable for arctic conditions?
Yes, the S355NL impact test at -50°C ensures excellent toughness for arctic offshore platforms and wind towers, with coatings recommended for corrosion resistance in marine settings.

How does S355NL compare to S355N?
S355NL is tested at -50°C, ideal for sub-zero climates, while S355N is tested at -20°C, better for temperate regions. Both share similar strength (355 MPa yield). See EN 10025-3 S355N normalized structural steel plate.

What supports S355NL Charpy performance?
Low carbon (≤0.18%), sulfur (≤0.015%), and grain-refining elements (Al, Nb) in the S355NL composition ensure fine-grain structure, enhancing toughness at -50°C.