EN 10025-3 S355N ASTM Equivalent Analysis

EN 10025-3 S355N ASTM Equivalent Analysis

At Gangsteel, we’re committed to helping engineers identify the EN 10025-3 S355N ASTM equivalent to ensure compatibility for global structural projects. S355N, a high-strength, low-alloy structural steel under EN 10025-3, is renowned for its fine-grain structure, 355 MPa yield strength, and -20°C toughness, making it ideal for bridges, cranes, and building frameworks in moderate climates. The closest ASTM equivalent is A572 Grade 50, which offers comparable strength and performance.

As part of the en 10025 3 normalized steel plate family, S355N excels in structural applications. Gangsteel analyzes the equivalence of S355N to A572 Grade 50, comparing their chemical composition, mechanical properties, and applications, with ties to grades like en 10025 3 s420n normalized structural steel plate and en 10025 3 s460n normalized structural steel plate. For stock, quotes, or further details, contact us or visit our en 10025 3 s355n normalized structural steel plate page.

What is EN 10025-3 S355N?

S355N is a normalized or normalized rolled fine-grain structural steel under EN 10025-3:2019, with:

• S: Structural steel.
• 355: Minimum yield strength of 355 MPa (≤16 mm).
• N: Normalized, with impact toughness tested at -20°C.
• Material Number: 1.0545.

Its fine-grain microstructure ensures high strength, toughness, and weldability, ideal for moderate climates. Compared to en 10025 3 s460n normalized structural steel plate, S355N has lower strength (355 MPa vs 460 MPa) but is more cost-effective for general structural use.

S355N ASTM Equivalent: A572 Grade 50

The closest ASTM equivalent to EN 10025-3 S355N is A572 Grade 50, a high-strength, low-alloy structural steel under ASTM A572/A572M. A572 Grade 50 offers:

• Minimum Yield Strength: ~345 MPa.
• Toughness: Suitable for moderate climates, though impact toughness is not always specified.

A572 Grade 50 is widely used in North American construction, making it a practical substitute for S355N in applications requiring similar strength and performance. For colder climates requiring guaranteed -50°C toughness, en 10025 3 s355nl normalized structural steel plate or ASTM A633 Grade C may be considered.

Key Similarities

• Strength: A572 Grade 50’s ~345 MPa yield strength is close to S355N’s 355 MPa.
• Applications: Both are used in bridges, buildings, and structural frameworks.
• Weldability: Low carbon equivalent (CEV) ensures compatibility with similar welding processes.

Key Differences

• Toughness: S355N guarantees ≥27 J at -20°C; A572 Grade 50’s toughness is not always specified but can be tailored.
• Processing: S355N is normalized for fine-grain structure; A572 Grade 50 is typically hot-rolled but can be normalized.

Chemical Composition Comparison

S355N and A572 Grade 50 share similar compositions:

Carbon Equivalent (CEV):

• S355N: ≤0.43% (≤63 mm).
• A572 Gr 50: ≤0.45% (estimated, varies by thickness).

S355N’s lower sulfur (0.025% vs 0.050%) and phosphorus (0.030% vs 0.040%) enhance weldability and toughness, making it a close match to A572 Grade 50, similar to en 10025 3 s420n normalized structural steel plate.

Mechanical Properties Comparison

S355N and A572 Grade 50 align closely in key properties:

• Yield Strength: S355N’s 355 MPa slightly exceeds A572 Gr 50’s 345 MPa, but both are suitable for moderate-load structures.
• Tensile Strength: S355N (470-630 MPa) and A572 Gr 50 (450-620 MPa) are comparable, ensuring similar durability.
• Elongation: S355N’s ≥22% is slightly higher than A572 Gr 50’s ≥21%, offering marginally better ductility.
• Impact Toughness: S355N guarantees ≥27 J at -20°C; A572 Gr 50’s toughness is not standard but can be specified for similar performance.
• Thickness: S355N up to 200 mm, A572 Gr 50 up to 100 mm, versatile like en 10025 3 s355n normalized structural steel plate.

Welding and Heat Treatment

• S355N: CEV ≤0.43%, preheating typically not required for <20 mm; optional for thicker plates (100-150°C); PWHT optional (550-650°C). Consumables: ER70S-6 (GMAW), EM12K flux with EH14 wire (SAW).
• A572 Gr 50: CEV ≤0.45%, similar welding properties; preheating may be needed for thicker plates.

S355N’s lower sulfur and phosphorus enhance weld quality, making it a strong equivalent to A572 Gr 50, similar to en 10025 3 s275n normalized structural steel plate.

Applications

• S355N: Bridges, cranes, and building frameworks in moderate climates, leveraging its fine-grain structure and guaranteed -20°C toughness.
• A572 Gr 50: Similar applications in North America, including buildings, bridges, and structural components, with comparable strength.

Both grades support robust structural projects, with S355N offering assured toughness for critical applications.

Why Choose Gangsteel?

Gangsteel supplies S355N and A572 Gr 50:

• Inventory: Extensive stock in China.
• Sizes: Thickness 6–200 mm (S355N), up to 100 mm (A572 Gr 50), widths 2000/2500/3000 mm, lengths up to 12,000 mm.
• Delivery: 7-30 days globally.
• Certifications: EN 10204 3.1/3.2 (S355N), ASTM compliance (A572 Gr 50), UT testing (EN 10160), ABS/LR/BV/DNV approvals.
• Processing: Cutting, welding, bending.

Contact us for en 10025 3 s355n normalized structural steel plate.

FAQ

What is the ASTM equivalent to EN 10025-3 S355N?
A572 Grade 50 is the closest ASTM equivalent to EN 10025-3 S355N, with ~345 MPa yield strength and comparable performance.

How do S355N and A572 Gr 50 strengths compare?
S355N’s 355 MPa yield strength slightly exceeds A572 Gr 50’s 345 MPa, but both are suitable for moderate-load structures.

Is A572 Gr 50 a direct substitute for S355N?
A572 Gr 50 is a close substitute for S355N, though S355N’s guaranteed -20°C toughness (≥27 J) may require specific A572 Gr 50 testing for critical applications.

How does weldability compare between S355N and A572 Gr 50?
S355N’s lower CEV (≤0.43%) and impurities (S: 0.025%, P: 0.030%) enhance weldability compared to A572 Gr 50 (CEV ≤0.45%, S: 0.050%, P: 0.040%).

What applications use S355N and A572 Gr 50?
Both are used in bridges, cranes, and building frameworks in moderate climates, with S355N preferred for guaranteed toughness.

What certifications support S355N and A572 Gr 50?
Gangsteel provides S355N with EN 10204 3.1/3.2 and A572 Gr 50 with ASTM compliance, plus UT testing (EN 10160) and ABS/LR/BV/DNV approvals.

Summary

EN 10025-3 S355N and ASTM A572 Grade 50 are high-strength structural steels with comparable properties, offering 355 MPa and ~345 MPa yield strengths, respectively, and suitability for moderate climates.

S355N’s fine-grain structure and guaranteed -20°C toughness (≥27 J) make it ideal for critical applications like bridges and cranes, while A572 Gr 50’s similar strength suits North American construction projects.

Gangsteel’s inventory supports S355N thicknesses up to 200 mm and A572 Gr 50 up to 100 mm, with global delivery in 7-30 days and certifications like EN 10204 3.1/3.2.

S355N’s lower CEV and impurities enhance its weldability, making it a robust ASTM equivalent to A572 Gr 50 for structural projects requiring reliable performance.