What is Chinese grade equal s355n?

S355N Chinese Equivalent: Q355D Steel

At Gangsteel, we’re here to help engineers identify the S355N Chinese equivalent, ensuring compatibility for projects bridging European and Chinese standards. 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 Chinese equivalent is Q355D, as defined by GB/T 1591-2018, offering comparable strength and toughness.

As part of the en 10025 3 normalized steel plate family, S355N excels in structural applications. Gangsteel compares S355N and Q355D, detailing their chemical composition, mechanical properties, and applications, with ties to grades like en 10025 3 s420n normalized structural steel plate and en 10025 3 s355nl 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 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 Chinese Equivalent: Q355D

The closest S355N Chinese equivalent is Q355D, a high-strength low-alloy steel under GB/T 1591-2018, with:

• Q: Quenched or high-strength steel.
• 355: Minimum yield strength of 355 MPa.
• D: Quality grade with -20°C toughness.

Q355D is widely used in Chinese construction and manufacturing, offering a near-identical match to S355N in yield strength, toughness, and weldability, making it a seamless substitute for Asian projects.

Key Similarities

• Yield Strength: Both S355N and Q355D offer 355 MPa (≤16 mm).
• Toughness: Both provide excellent impact resistance at -20°C (S355N: ≥27 J, Q355D: ≥34 J).
• Weldability: Low carbon equivalent (CEV) ensures easy welding for structural applications.

Q355D is a direct equivalent to S355N, comparable to en 10025 3 s420n normalized structural steel plate in terms of structural versatility.

Chemical Composition Comparison

S355N and Q355D share similar compositions:

Carbon Equivalent (CEV):

• S355N: ≤0.43% (≤63 mm).
• Q355D: ≤0.44%.

Q355D’s lower sulfur (0.015% vs 0.025%) and slightly lower carbon (0.18% vs 0.20%) enhance weldability and toughness, making it an excellent S355N Chinese equivalent, similar to en 10025 3 s275n normalized structural steel plate.

Mechanical Properties Comparison

S355N and Q355D align closely in mechanical properties:

• Strength: Both offer 355 MPa yield strength, ideal for structural applications like bridges.
• Tensile Strength: Identical range (470-630 MPa) ensures comparable durability.
• Elongation: S355N’s ≥22% is slightly higher than Q355D’s ≥20%, offering marginally better ductility.
• Toughness: Q355D’s ≥34 J at -20°C slightly outperforms S355N’s ≥27 J, enhancing reliability in moderate climates.
• Thickness: Both support up to 200 mm, versatile for structural use, similar to en 10025 3 s355nl 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 (0.015%) enhances weld quality. Preheating for thicker plates; PWHT optional.

Q355D’s slightly better weldability due to lower sulfur makes it a practical S355N Chinese equivalent for welded structures.

Applications

• S355N: Used in bridges, cranes, and building frameworks in moderate climates, leveraging its 355 MPa yield strength and -20°C toughness.
• Q355D: Similar applications in Chinese markets, including high-rise buildings, infrastructure, and heavy machinery, with comparable strength and toughness.

Both grades support robust structural projects, with Q355D being a preferred choice in Asia due to local availability and cost-effectiveness.

Why Choose Gangsteel?

Gangsteel supplies S355N and its Chinese equivalent Q355D:

• 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 for S355N, GB/T 1591 compliance for Q355D, UT testing (EN 10160), and ABS/LR/BV/DNV approvals.
• Processing: Cutting, welding, and bending tailored to your project needs.

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

FAQ

What is the Chinese grade equivalent to S355N?
The S355N Chinese equivalent is Q355D (GB/T 1591), matching 355 MPa yield strength and -20°C toughness for structural applications.

How does S355N compare to Q355D?
S355N and Q355D share 355 MPa yield strength and -20°C toughness, with Q355D offering slightly better weldability (lower sulfur, 0.015% vs 0.025%) and toughness (≥34 J vs ≥27 J).

Is Q355D a direct substitute for S355N?
Yes, Q355D is a direct S355N Chinese equivalent, with nearly identical strength, toughness, and weldability, ideal for Asian manufacturing.

What applications use S355N and Q355D?
Both S355N and Q355D are used in bridges, cranes, building frameworks, and heavy machinery in moderate climates, with Q355D common in Chinese high-rise projects.

How does weldability compare between S355N and Q355D?
Q355D’s lower sulfur and slightly lower carbon enhance weldability compared to S355N, though both have low CEV (≤0.44% and ≤0.43%) for reliable welding.

What certifications support S355N and Q355D?
Gangsteel provides S355N with EN 10204 3.1/3.2 and UT testing (EN 10160); Q355D complies with GB/T 1591, with ABS/LR/BV/DNV approvals available.