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Structural Steel 420

Structural Steels S235, S275, S355, S420

Structural steels are the most widely used steels because they have a good balance between physical properties and price.

Structural steels rust quickly, so they are often coated with a powder coating or by galvanizing.

The number in a structural steel’s name is its yield strength, the maximum load that does not end in plastic deformation. Stress above that value will deform the metal permanently. Anything below results in elastic deformation, meaning that the steel will return to its original shape when the load is removed.  Tensile strength refers to the maximum load that does not break the metal.

Table. Mechanical Properties of Structural Steels

Tensile strength, Rm, MPa (N/mm2)0.2% Yield strength, Rp0, 2min, (MPa)Brinell hardness, HB max
S235360 – 510235100 – 154
S275370 – 530275121 – 163
S355470 – 630355146 – 187
S420480 – 620420143 – 184

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