EN 10025 S275NL Equivalent GB China Grade

As a leading exporter and manufacturer of high-quality structural steel plates, Gangsteel specializes in producing EN 10025-3 compliant materials, including the S275NL steel grade.

S275NL is a normalized fine-grain structural steel designed for welded constructions, offering excellent toughness at low temperatures down to -50°C, making it ideal for bridges, offshore structures, and cranes.

Identifying its equivalent in the Chinese GB standard is crucial for projects requiring compliance with Chinese specifications.

Our S275NL plates are supplied in normalized or normalized rolled conditions, ensuring superior weldability and performance.

For a comprehensive overview of our en 10025 3 normalized steel plate offerings, explore our full range.

S275NL and Its GB Equivalent

S275NL (EN 10025-3, designation 1.0491) is a low-alloy, fine-grain structural steel with a minimum yield strength of 275 MPa and a minimum Charpy V-notch impact energy of 27 Joules at -50°C, perfect for cold-environment applications. The closest equivalent in the Chinese GB standard is Q275N (GB/T 1591-2018), a high-strength low-alloy structural steel with comparable yield strength, tensile properties, and normalized delivery. Q275N ensures similar weldability and toughness, making it a direct substitute for S275NL in Chinese-compliant projects. In some cases, Q275NL (with -50°C impact testing) may be specified for an even closer match.

Gangsteel supplies both EN and GB-certified plates, ensuring seamless integration for international projects. For related grades, see en 10025 3 s275nl normalized structural steel plate or en 10025 3 s355nl normalized structural steel plate.

Equivalent Grades Table

Chemical Composition Comparison

Both grades feature low-carbon profiles for weldability (ladle analysis, max % unless noted, ≤100 mm thickness).

*Note: S275NL’s tighter C, P, and S limits enhance cold toughness; Q275N’s broader alloy range maintains weldability.

Mechanical Properties Comparison

Properties for normalized condition (≤16 mm thickness, minimum values).

*Notes: Q275N standard impact is at -20°C; specify Q275NL for -50°C to match S275NL. Properties scale similarly with thickness up to 250 mm.

Applications and Substitution Notes

• S275NL: Used in cold-climate bridges, offshore platforms, and cranes requiring -50°C toughness.
• Q275N: Suits similar welded structures in Chinese projects; Q275NL ensures -50°C performance for arctic applications.

When substituting, confirm Q275N’s impact testing at -50°C (as Q275NL) to match S275NL’s requirements. For higher strength, consider en 10025 3 s420nl normalized structural steel plate.

Why Choose Gangsteel?

Gangsteel offers ISO-certified S275NL and Q275N/Q275NL plates with dual certifications, ensuring global compatibility. Contact us at admin@gangsteel.com for tailored solutions.

Summary

The GB equivalent to EN 10025-3 S275NL is Q275N (GB/T 1591-2018), with identical 275 MPa yield strength and comparable tensile properties (370–510 MPa). For -50°C toughness, specify Q275NL to match S275NL’s 27 J impact requirement. Both are ideal for welded structures in cold environments, with Q275N serving as a reliable substitute in Chinese-standard projects.

FAQ

What is the GB equivalent to S275NL?

Q275N (GB/T 1591-2018) is the closest match, with 275 MPa yield and normalized delivery. Specify Q275NL for -50°C impact equivalence (27 J).

How do S275NL and Q275N differ chemically?

S275NL has lower carbon (0.16% vs. 0.20%), phosphorus (0.025% vs. 0.035%), and sulfur (0.020% vs. 0.035%) for enhanced cold toughness, but both maintain CEV ≤0.42 for weldability.

Are the mechanical properties of S275NL and Q275N identical?

They share identical yield (275 MPa) and tensile strength (370–510 MPa) at ≤16 mm, with S275NL’s 24% elongation slightly higher than Q275N’s 22%. Q275N needs Q275NL designation for -50°C impact (27 J).

Can Q275N replace S275NL in cold environments?

Yes, if specified as Q275NL with 27 J impact at -50°C, it matches S275NL for applications like arctic bridges or offshore platforms.

What if I need a higher-strength GB equivalent?

For S355NL, use Q345N/Q345NL (GB/T 1591); contact Gangsteel for cross-standard guidance.

Last Updated: October 30, 2025