Mechanical Properties of Structural Steel - S235, S275, S355
The mechanical properties of structural steel are fundamental to its classification and application. Even though chemical composition is a dominant factor in determining the mechanical properties of steel, it is also very important to understand the minimum standards for the mechanical properties or performance characteristics, such as yield strength and tensile strength, which are described in more detail below.
Yield Strength
The yield strength of structural steel measures the minimum force required to create a permanent deformation in the steel. The naming convention used in European Standard EN10025 refers to the minimum yield strength of the steel grade tested at 16mm thick.
|
Structural Steel Grade at 16mm |
Minimum Yield Strength at nominal thickness 16mm |
|
|
psi |
N/mm2 (MPa) |
|
|
S235 |
33 000 |
235 N/mm2 |
|
S275 |
36 000 |
275 N/mm2 |
|
S355 |
50 000 |
355 N/mm2 |
Tensile Strength
The Tensile Strength of structural steel relates to the point at which permanent deformation occurs when the material is pulled or stretched laterally along its length.
|
Structural Steel Grade |
Tensile Strength MPa at Nom thickness between 3mm and 16mm |
|
S235 |
360 – 510 MPa |
|
S275 |
370 – 530 MPa |
|
S355 |
470 – 630 MPa |
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