S355NL vs S355JR Structural Comparison

S355NL vs S355JR: Structural Comparison

S355NL vs S355JR is a key comparison for engineers choosing structural steels under the EN 10025 standard. S355NL, specified under EN 10025-3, is a normalized fine-grain steel optimized for low-temperature toughness, while S355JR, under EN 10025-2, is a hot-rolled non-alloy steel for general use. This article compares their chemical composition, mechanical properties, weldability, and applications to highlight the S355JR vs S355NL differences, addressing core keywords s355nl vs s355jr, s355jr vs s355nl, and partially s355nl s355j2 (as S355JR is similar to S355J2). For more details, visit our EN 10025-3 S355NL normalized structural steel plate.

Overview of S355NL and S355JR

S355NL (EN 10025-3)

S355NL is a fine-grain structural steel, normalized or normalized rolled, with:

• S: Structural steel.
• 355: Minimum yield strength of 355 MPa (≤16 mm).
• NL: Normalized, with impact toughness tested at -50°C for low-temperature performance.

It’s ideal for cold climates, such as offshore platforms and arctic bridges.

S355JR (EN 10025-2)

S355JR is a non-alloy structural steel, typically hot-rolled, with:

• S: Structural steel.
• 355: Minimum yield strength of 355 MPa (≤16 mm).
• JR: Impact toughness tested at +20°C (or not tested, depending on specification).

S355JR is cost-effective for general construction in temperate climates. Note: S355JR is similar to S355J2 (tested at -20°C), so the s355nl s355j2 keyword partially applies here due to their comparable properties.

Chemical Composition Comparison

The S355NL vs S355JR comparison reveals differences in composition affecting toughness and weldability.

Carbon Equivalent (CEV):

• S355NL: ≤0.43% (≤63 mm), enhanced by fine-grain elements (Al, Nb).
• S355JR: ≤0.45% (≤40 mm), higher due to less stringent alloy control.

The S355JR vs S355NL composition shows S355NL’s lower carbon (0.18% vs 0.24%), phosphorus, sulfur, and grain-refining elements improve toughness and weldability, while S355JR’s simpler composition reduces costs.

Mechanical Properties Comparison

The S355NL vs S355JR mechanical properties differ primarily in toughness and testing conditions.

Strength: Both grades share identical yield (355 MPa) and tensile strengths (470-630 MPa) for similar thicknesses, ensuring comparable load-bearing capacity.
Toughness: The key S355JR vs S355NL difference is toughness. S355NL’s -50°C impact testing (≥27 J) suits sub-zero climates, while S355JR’s +20°C testing (or none) limits it to milder conditions.
Thickness Range: S355NL supports up to 250 mm with robust low-temperature properties; S355JR up to 250 mm but without guaranteed cold performance.

Welding and Heat Treatment

• S355NL: CEV ≤0.43% ensures excellent weldability with GMAW or SAW (EN 1011-2). Preheating (100-150°C) for >20 mm; PWHT (550-650°C) optional. Consumables: ER70S-6 (GMAW), EM12K flux with EH14 wire (SAW).
• S355JR: CEV ≤0.45% supports welding but requires more preheating (>25 mm) due to higher carbon and impurities. Same consumables apply.

The S355NL vs S355JR welding difference favors S355NL for reduced weld imperfections due to its fine-grain structure and lower CEV.

Applications

• S355NL:
  • Offshore platforms in cold marine environments.
  • Wind towers in sub-zero climates.
  • Bridges and cranes in northern regions.
    Its -50°C toughness ensures reliability in extreme cold. See EN 10025-3 S355NL normalized structural steel plate.
• S355JR:
  • Building frameworks in temperate climates.
  • Bridges and machinery in moderate conditions.
  • General fabrication where cost is a priority.

The S355JR vs S355NL application difference highlights S355NL’s suitability for cold environments and S355JR’s affordability for standard conditions. The partial relevance of s355nl s355j2 reflects S355JR’s similarity to S355J2, which has -20°C toughness but is still less cold-tolerant than S355NL.

Equivalent Grades

• S355NL: ASTM A633 Grade E, Q345E (China), StE 355 (DIN).
• S355JR: ASTM A572 Grade 50, Q345B (China), SM490A (JIS).

See EN 10025-3 S420NL normalized structural steel plate.

Why Choose Gangsteel?

Gangsteel supplies both grades:

• 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 main difference in S355NL vs S355JR?
S355NL is a normalized fine-grain steel tested at -50°C (≥27 J), ideal for cold climates like arctic offshore platforms. S355JR is a hot-rolled non-alloy steel tested at +20°C (if tested), suited for temperate general construction. Both have 355 MPa yield strength.

How does toughness differ in S355JR vs S355NL?
S355NL ensures ≥27 J at -50°C, making it reliable for sub-zero environments like northern bridges. S355JR’s toughness (≥27 J at +20°C, if tested) limits it to milder climates, lacking guaranteed low-temperature performance.

Which is better for cold climates in S355NL vs S355JR?
S355NL is superior for cold climates due to its -50°C impact toughness, ensuring safety in arctic or offshore applications. S355JR is not suitable for sub-zero conditions.

Are S355JR vs S355NL weldable?
Yes, but S355NL (CEV ≤0.43%) is more weldable with lower preheating needs (100-150°C for >20 mm) than S355JR (CEV ≤0.45%, >25 mm preheat), due to lower carbon and impurities, reducing weld imperfections.

What are applications of S355NL vs S355JR?
S355NL is used in cold-climate offshore platforms, wind towers, and bridges; S355JR suits temperate building frameworks, bridges, and general fabrication where cost is key.

How does S355NL S355J2 relate to S355JR?
S355JR is similar to S355J2 (tested at -20°C), both hot-rolled non-alloy steels under EN 10025-2. S355NL outperforms both at -50°C, making it better for cold environments than S355J2 or S355JR.

Explore related grades like EN 10025-3 S275N normalized structural steel plate.