S275M and S275N are European standard structural steels with a minimum yield strength of 275 MPa, differing mainly in their delivery condition: S275M (EN 10025-4) is thermomechanically rolled (M) for excellent weldability, while S275N (EN 10025-3) is delivered normalized (N) and provides guaranteed low-temperature toughness, with S275NL offering even colder resistance. Both are fine-grain steels, but the 'N' (Normalized) means better ductility and impact strength at low temps, suited for bridges, construction, and energy, unlike the 'M' (TMCP) which focuses on controlled rolling.
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 | |||||
Mechanical properties 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 | |
S275M Steel Plate
Standard: EN 10025-4 (Thermomechanically Rolled).
Delivery Condition: "M" for Thermomechanical Rolling (TMCP), using controlled rolling and accelerated cooling.
Properties: Fine-grain, weldable, good strength.
Best For: Applications needing good weldability and strength without needing separate normalizing heat treatment.
S275N Steel Plate
Standard: EN 10025-3 (Normalized).
Delivery Condition: "N" for Normalized, a heat treatment process.
Properties: Fine-grain, weldable, with guaranteed low-temperature toughness (e.g., 47 Joules at -20°C).
S275NL: A variation offering even tougher low-temp performance (e.g., 27 Joules at -50°C).
Best For: Moderate to cold environments, structures needing guaranteed impact resistance like bridges, cranes, and heavy machinery.
Key Differences Summarized
Processing: S275M uses TMCP (M), S275N uses Normalizing (N).
Impact Testing: S275N/NL have specific low-temp impact energy guarantees, crucial for cold climates, a feature not inherent to S275M without further processing.
Application Focus: S275M excels in fabrication, while S275N/NL offers assured low-temperature performance.
