S355N Chinese Equivalent Q355D Steel

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