S355M and S275M are high-strength, normalized/thermo-mechanically rolled (M) structural steel plates under EN 10025-4, differing mainly in strength: S355M offers higher yield (min 355 MPa) and tensile strength (470-630 MPa) with better low-temp toughness, making it for demanding builds (bridges, offshore), while S275M (yield ~275 MPa) is a strong, cost-effective choice for general construction, with S355M providing more strength for less weight.
Chemical Composition
|
Grade/ Material |
Element |
Composition( Max-A, Min-I) |
|
DIN EN 10025-4 S275M |
C |
A:0.13 |
|
Mn |
A:1.50 |
|
|
Si |
A:0.50 |
|
|
P |
A:0.030 |
|
|
S |
A:0.025 |
|
EN10025-4 S355M Chemical Composition |
|||||||
|
Grade |
The Element Max (%) |
||||||
|
C |
Si |
Mn |
P |
S |
Al |
N |
|
|
S355M |
0.16 |
0.55 |
1.70 |
0.035 |
0.030 |
0.015 |
0.017 |
|
Nb |
V |
Ti |
Cu |
Cr |
Ni |
Mo |
|
|
0.06 |
0.12 |
0.06 |
0.60 |
0.35 |
0.55 |
0.13 |
|
Mechanical Properties
|
Grade/ Material |
Tensile Test |
MPa |
|
DIN EN 10025-4 S275M |
Tensile Strength |
370-530 |
|
Yield Strength |
I:275 |
|
|
Elongation |
I:24% |
|
|
Impact Test( if any) |
-- |
|
Grade
|
Thickness |
Yield Strength |
Tensile Strength |
Elongation |
Impact Energy |
|
(mm) |
MPa (min) |
MPa |
% (min) |
(KV J) (min) |
|
|
|
|
|
|
-20 degree |
|
|
S355M |
≤16 |
355 |
470-630 |
22 |
40 |
|
16> to ≤40 |
345 |
470-630 |
22 |
40 |
|
|
40> to ≤63 |
355 |
450-610 |
22 |
40 |
|
|
63> to ≤80 |
325 |
440-600 |
22 |
40 |
|
|
80> to ≤100 |
325 |
440-600 |
22 |
40 |
|
|
100> to ≤120 |
320 |
430-590 |
22 |
40 |
In Summary
S275M: Good strength, cost-effective, general high-strength use.
S355M: Higher strength, better low-temp toughness, lighter design possible, for demanding projects.
