Non-alloy steels are classified by their carbon content as low, medium and high carbon steel. Each has their own uses and the characteristics vary. Also, different treatment methods are available accordingly. Structural steel S235, S275, S355, S420 are example of famous non alloy steel.
Below structural steel mechanical properties gives idea about strength of different grades:
Grade |
Tensile strength, Rm, MPa (N/mm2) |
0,2% Yield strength, Rp0, 2min, (MPa) |
Brinell hardness, HB max |
S235 |
360 – 510 |
235 |
100 – 154 |
S275 |
370 – 530 |
275 |
121 – 163 |
S355 |
470 – 630 |
355 |
146 – 187 |
S420 |
480 – 620 |
420 |
143 – 184 |