S355N Equivalent Materials Guide

S355N Equivalent Materials Guide

At Gangsteel, we’re dedicated to helping engineers and project managers identify the perfect S355N equivalent materials to ensure seamless integration in 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.

As part of the en 10025 3 normalized steel plate family, S355N offers reliable performance for demanding applications. Gangsteel maps out the closest equivalent grades from international standards like ASTM, DIN, GB, and JIS, 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 S355N Steel?

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, achieved through normalization, ensures high strength, toughness, and weldability, making it suitable 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 applications.

S355N Equivalent Grades by Standard

Gangsteel identifies the closest S355N equivalent grades that align with its strength, toughness, and weldability:

Closest Equivalents

• Q355D (China, GB/T 1591): Matches S355N’s 355 MPa yield and -20°C toughness, ideal for Asian projects.
• A572 Grade 50 (ASTM): Close match with ~345 MPa yield and comparable toughness, widely used in North America.
• StE 355 (DIN): Nearly identical strength and toughness, a historical European equivalent.

For colder climates requiring -50°C toughness, S355NL (EN 10025-3) is a better equivalent, as noted in en 10025 3 s355nl normalized structural steel plate.

Chemical Composition Comparison

S355N and its equivalents share similar compositions:

Carbon Equivalent (CEV):

• S355N: ≤0.43% (≤63 mm).
• Q355D: ≤0.44%.
• A572 Gr 50: ≤0.45%.

Q355D’s lower sulfur (0.015% vs 0.025%) enhances weldability, making it a strong S355N equivalent, while A572 Gr 50’s higher carbon (0.23%) slightly increases strength but may reduce toughness compared to S355N, similar to en 10025 3 s420n normalized structural steel plate.

Mechanical Properties Comparison

S355N and its equivalents align in key properties:

• Strength: Q355D matches S355N’s 355 MPa yield; A572 Gr 50 is close at 345 MPa.
• Toughness: Q355D’s ≥34 J at -20°C slightly outperforms S355N’s ≥27 J; A572 Gr 50 lacks a standard toughness requirement but is suitable for moderate climates.
• Elongation: S355N’s ≥22% elongation is slightly higher than Q355D (20%) and A572 Gr 50 (21%), offering better ductility.
• Thickness: S355N and Q355D 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 thinner plates (<20 mm); PWHT optional (550-650°C). Consumables: ER70S-6 (GMAW), EM12K flux with EH14 wire (SAW).
• Q355D: CEV ≤0.44%, similar welding properties; lower sulfur enhances weld quality.
• A572 Gr 50: CEV ≤0.45%, comparable weldability, may require preheating for thicker plates.

S355N and Q355D offer excellent weldability, with Q355D slightly better due to lower sulfur, similar to en 10025 3 s275n normalized structural steel plate.

Applications

• S355N: Bridges, cranes, building frameworks in moderate climates, leveraging 355 MPa yield strength.
• Q355D: Similar structural applications in Asian markets, e.g., high-rise buildings and infrastructure.
• A572 Gr 50: General structural use in North America, e.g., buildings and bridges with moderate strength needs.

S355N equivalents support comparable applications, with Q355D ideal for Asian sourcing and A572 Gr 50 for North American projects.

Why Choose Gangsteel?

Gangsteel supplies S355N and its equivalents:

• Inventory: Extensive stock in China for rapid delivery.
• Sizes: Thicknesses 6–200 mm, widths 2000/2500/3000 mm, lengths up to 12,000 mm.
• Delivery: Ships globally in 7-30 days.
• Certifications: EN 10204 3.1/3.2, UT testing (EN 10160), ABS/LR/BV/DNV approvals.
• Processing: Cutting, welding, bending tailored to your needs.

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

FAQ

What is the best S355N equivalent material?
Q355D (China) is the best S355N equivalent, matching 355 MPa yield and -20°C toughness, ideal for structural projects in Asia.

What is the S355N equivalent in the USA?
A572 Grade 50 (ASTM) is a close S355N equivalent, with ~345 MPa yield and comparable performance for moderate climates.

How does S355N compare to Q355D?
S355N and Q355D share 355 MPa yield and -20°C toughness, with Q355D slightly better in weldability (lower sulfur, 0.015% vs 0.025%).

What is the S355N equivalent in Germany?
StE 355 (DIN) is the S355N equivalent, with similar 355 MPa yield and -20°C toughness for European projects.

Can S355J2 replace S355N?
S355J2 (EN 10025-2) can replace S355N in less demanding applications but lacks the fine-grain structure and guaranteed toughness of S355N.

What applications use S355N equivalent materials?
S355N equivalents like Q355D and A572 Gr 50 are used in bridges, cranes, and building frameworks in moderate climates, similar to en 10025 3 s420n normalized structural steel plate.