Chemical Composition of Structural Steels - S235, S275 and S355
The Chemical composition of Structural Steel is extremely important and highly regulated. It is a fundamental factor which defines the Mechanical properties of the steel material. In the following table you can see the Max % levels of certain regulated elements present in European Structural steel grades S235, S275 and S355.
|
EU Grade |
C% |
Mn% |
P% |
S% |
Si% |
|
S235 |
0.22 max |
1.60 max |
0.05 max |
0.05 max |
0.05 max |
|
S275 |
0.25 max |
1.60 max |
0.04 max |
0.05 max |
0.05 max |
|
S355 |
0.23 max |
1.60 max |
0.05 max |
0.05 max |
0.05 max |
The chemical composition of structural steel is incredibly important to the engineer and will change with specific grades depending on their intended use. For example, S355K2W is a structural steel that has been NMened, denoted by K2, and has been designed with a chemical composition to withstand increased weathering - W. Therefore, this grade of structural steel will have a slightly different chemical composition to the standard S355 grade.
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