S275N and S275M are weldable, fine-grain structural steels under European standards (EN 10025-3 for S275N/NL, EN 10025-4 for S275M) with a minimum yield strength of 275 MPa, differing mainly in their manufacturing and low-temperature toughness: S275N is normalized (N) for good weldability and impact tested at -20°C, while S275M uses thermomechanical rolling (TMCP) for improved homogeneity, often eliminating separate normalization, making it cost-effective for general construction, though S275NL offers superior toughness at -50°C.
Mechnical property for S275N steel plate
| Thickness (mm) | ||||||||
| S275N | ≤ 16 | > 16 ≤ 40 | > 40 ≤ 63 | > 63 ≤ 80 | > 80 ≤ 100 | > 100 ≤ 150 | > 150 ≤ 200 | > 200 |
| Yield strength (≥Mpa) | 275 | 265 | 255 | 245 | 235 | 225 | 215 | 205 |
| ≤ 100 | > 100 ≤ 200 | > 200 | ||||||
| Tensile strength (Mpa) | 370-510 | 350-480 | 350-480 | |||||
Mechnical property for S275M steel plate
|
Grade
|
Thickness |
Yield Strength |
Tensile Strength |
Elongation |
Impact Energy |
|
(mm) |
MPa (min) |
MPa |
% (min) |
(KV J) (min) |
|
|
|
|
|
|
-20 degree |
|
|
S275M |
≤16 |
275 |
370-530 |
24 |
40 |
|
16> to ≤40 |
265 |
370-530 |
24 |
40 |
|
|
40> to ≤63 |
255 |
350-510 |
24 |
40 |
|
|
63> to ≤80 |
245 |
350-510 |
24 |
40 |
|
|
80> to ≤100 |
245 |
350-510 |
24 |
40 |
|
|
100> to ≤120 |
240 |
350-510 |
24 |
40 |
Chemical composition for S275N steel plate
| Main chemical elements composition of S275N steel plate | ||||||
| C | Si | Mn | P | S | Nb | V |
| 0.18 | 0.40 | 0.50-1.50 | 0.030 | 0.025 | 0.05 | 0.05 |
| Al(total) | Ti | Cr | Ni | Mo | Cu | N |
| ≥0.02 | 0.05 | 0.30 | 0.30 | 0.10 | 0.55 | 0.015 |
Chemical composition for S275M steel plate
|
EN10025-4 S275M Chemical Composition |
|||||||
|
Grade |
The Element Max (%) |
||||||
|
C |
Si |
Mn |
P |
S |
Al |
N |
|
|
S275M |
0.15 |
0.55 |
1.60 |
0.030 |
0.030 |
0.015 |
|
|
Nb |
V |
Ti |
Cu |
Cr |
Ni |
Mo |
|
|
0.06 |
0.10 |
0.06 |
0.60 |
0.35 |
0.35 |
0.13 |
|
S275N
S: Structural Steel.
275: Minimum yield strength (MPa).
N: Delivery condition is normalized, meaning controlled cooling to refine grain structure.
Toughness: Tested for Charpy V-notch impact energy at -20°C.
Use: General engineering, heavy machinery, bridges, but suited for moderate climates.
S275M
S: Structural Steel.
275: Minimum yield strength (MPa).
M: Delivery condition is thermomechanically rolled (TMCP), combining controlled rolling with accelerated cooling, reducing residual stresses.
Toughness: Offers good toughness and weldability, often without needing extra normalization.
Use: Economical choice for bridges, tanks, floodgates, and prefabricated structures where TMCP benefits are valuable.
Key Distinction: N vs. M
S275N uses a separate normalizing heat treatment after rolling.
S275M achieves its properties through TMCP, offering cost savings and better properties for many applications.
S275NL is a variation of S275N, offering tougher performance at colder temperatures (-50°C).
