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EN 10025-3 S275N High-strength Low-alloy (HSLA) Steel Plate

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EN 10025-3 S275N is a high-strength structural steel grade with a minimum yield strength of 275 MPa, designed for improved toughness and weldability.

Standard :
EN 10025-3
Grade :
S275N
Thickness :
0.8-30.0 mm
Width :
800-2500 mm
Length :
3000-12000 mm

Special thickness, width, and length can be negotiated separately.
We also provide customized processing services.If you have any questions, please contact us.

Overview

EN 10025-3 S275N is a normalized/normalized rolled structural steel plate with a minimum yield strength of 275 MPa, designed for improved toughness at lower temperatures.

EN 10025-3 is a European standard that specifies the technical delivery conditions for normalized/normalized rolled weldable fine grain structural steels. The designation S275N refers to a specific grade within this standard.

Standard and Grade Designation

Standard: EN 10025-3 (European Norm for hot-rolled structural steels, Part 3: Normalized/normalized rolled weldable fine grain steels).

Grade: S275N

"S" = Structural steel

"275" = Minimum yield strength (ReH) of 275 MPa (at ≤16mm thickness)

"N" = Normalized/normalized rolled delivery condition (enhances toughness and homogeneity).

Impact Toughness: Tested at -20°C (typical Charpy V-notch requirement ≥27J).

Mechanical Properties

Grade	Thickness	Yield Strength	Tensile Strength	Elongation	Impact Toughness (KV) (Charpy V-notch test)
S275N	≤16 mm	≥275 MPa	370–530 MPa	≥22%	≥27 J at -20°C
	≤16–40 mm	≥265 MPa	370–530 MPa	≥22%	≥27 J at -20°C
	≤40–63 mm	≥255 MPa	370–530 MPa	≥22%	≥27 J at -20°C
	≤63–100 mm	≥245 MPa	360–520 MPa	≥22%	≥27 J at -20°C

Applications

Used in structural components requiring good weldability and toughness, such as:

1. Bridges

2. Buildings

3. Heavy machinery

4. Offshore structures (if additional requirements are met)

Scenario for selecting S275N:

Structures at normal or moderately low temperatures (above -20°C).

Projects that are cost-sensitive and do not require extreme low-temperature toughness.

Other Information

Comparison with Other Grades:

S275JR (EN 10025-2): Non-normalized, lower impact toughness (tested at +20°C).

S355N: Higher strength (355 MPa yield) with similar normalized treatment.

Certification & Testing:

Supplied with inspection certificate (EN 10204 Type 3.1/3.2).

Testing includes tensile, impact (Charpy), and chemical analysis.

FAQ

Q1:

What are the weldability characteristics of high-strength low-alloy steel plates?

High-strength low-alloy steel plates offer excellent weldability. As their carbon content is typically low (below 0.2%), they present a lower risk of cracking during welding compared to standard high-strength steel plates and generally do not require complex preheating treatments.

Q2:

Why are high-strength low-alloy steels the preferred choice in construction and automotive manufacturing?

The key advantage of high-strength low-alloy steels is weight reduction. As they offer greater strength, thinner sheets can be used to withstand the same loads, thereby reducing the overall weight of the structure; in the automotive sector, this leads to improved fuel efficiency.

Q3:

What is high-strength low-alloy steel (HSLA)?

High-strength low-alloy steel (HSLA) is a type of steel in which small amounts of alloying elements (such as niobium, vanadium, titanium or copper) are added to enhance its mechanical properties. Compared to traditional carbon steel, it offers higher yield strength and better corrosion resistance whilst maintaining good weldability and formability.