Basic Information of S275N

Definition and Designation Meaning

S275N is a low-alloy high-strength structural steel under the European standard. The designation is structured as follows:

 

"S": Stands for Structural Steel, indicating its primary use in load-bearing structures across industries like construction and mechanical manufacturing.

"275": Represents the minimum yield strength of 275 MPa for steel with a thickness ≤16 mm. This value ensures the material can withstand significant external forces without obvious plastic deformation, providing structural stability.

"N": Denotes the delivery condition as Normalized or normalized-rolled. Normalization refines the grain structure, improves mechanical properties (e.g., strength, toughness, and workability), and homogenizes the microstructure.

Standards Compliance

S275N adheres to the EN 10025-3:2006 standard, which regulates:

 

Chemical Composition:

Specifies ranges for major elements (C, Si, Mn, P, S) and microalloying elements (Nb, V, Ti) to ensure desired properties.

Example limits:

C ≤0.18%, Mn: 0.45–1.60%, P/S ≤0.030%/0.025%.

Microalloying elements (Nb, V, Ti) are added to refine grains and enhance strength-toughness balance.

Mechanical Properties:

Yield Strength (ReH):

≥275 MPa (≤16 mm thickness); decreases with thickness (e.g., ≥245 MPa for 16–40 mm).

Tensile Strength (Rm): 410–560 MPa (varies with thickness).

Elongation (A): ≥24% (≤16 mm thickness), ensuring ductility.

Impact Toughness: ≥27 J (longitudinal) at -20°C (Note: "NL" grade extends this to -50°C, but "N" alone typically specifies -20°C).

Dimensional Tolerances:

Controls allowable deviations for thickness, width, and length to ensure precision and interchangeability in fabrication.

Surface Quality:

Prohibits defects like cracks, blisters, scabs, folds, and inclusions that could compromise performance during processing or service.

 

 

 

 

 

 

 

 

 

Comparison with Related Grades

Grade	Yield Strength (≤16mm)	Impact Temperature	Key Difference
S275JR	≥275 MPa	+20°C (room temp)	No microalloying; lowest cost.
S275J0	≥275 MPa	0°C	Improved low-temperature 韧性.
S275N	≥275 MPa	-20°C	Normalized for better toughness.
S275NL	≥275 MPa	-50°C	Enhanced low-temperature 韧性.

Processing Notes

Welding: Use low-hydrogen electrodes (e.g., E42xx series) for structural integrity.

Forming: Cold forming is feasible for moderate deformations; hot forming recommended for complex shapes to avoid work hardening.

Machining: Moderate hardness allows use of standard high-speed steel tools.

 

S275N's standardized properties and reliable performance make it a versatile choice for a wide range of structural applications within the European engineering framework.

 

 

 

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