S275M and S275ML are European standard (EN 10025-4) fine-grain structural steels, both weldable and thermomechanically rolled, but differ in their low-temperature impact toughness: S275M requires 40 Joules at -20°C, while S275ML requires 27 Joules at a colder -50°C, making ML suitable for colder environments, though both offer 275 MPa minimum yield strength and are used in general construction and machinery.
S275M vs S275ML – The Complete Low-Temperature Comparison
|
Property |
S275M |
S275ML |
Winner for Low-Temp Projects |
|---|---|---|---|
|
Standard |
EN 10025-4 |
EN 10025-4 |
- |
|
Impact Test Temperature |
–20 °C |
–50 °C |
S275ML |
|
Minimum KV (longitudinal) |
≥40 J |
≥27 J |
S275ML(much safer below –20 °C) |
|
Typical Actual KV (Gangsteel) |
80–200 J at –20 °C |
100–250 J at –50 °C |
S275ML |
|
Yield Strength ReH (MPa) |
275 → 215–225 (by thickness) |
Identical |
Tie |
|
Tensile Strength Rm (MPa) |
370–530 |
Identical |
Tie |
|
Elongation A5 (%) |
≥24 |
Identical |
Tie |
|
CEV max |
0.38 |
Identical |
Tie |
|
Preheat-free Welding (mm) |
Up to 100 |
Up to 100 |
Tie |
|
Price (December 2025) |
Baseline |
+50–80 USD/ton |
S275M cheaper, S275ML better value in cold |
|
Market Share (Cold-Region Projects) |
30–40 % |
60–70 % |
S275MLdominates |
Chemical Composition – Identical for Both Grades
|
Element |
C |
Si |
Mn |
P |
S |
Nb |
V |
Al min |
Ti |
Cr |
Ni |
Mo |
Cu |
N |
CEV max |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
S275M / S275ML |
0.14 |
0.50 |
1.50 |
0.030 |
0.025 |
0.05 |
0.10 |
0.020 |
0.05 |
0.30 |
0.30 |
0.10 |
0.55 |
0.015 |
0.38 |
Mechanical Properties – Identical Except Impact Temperature
|
Thickness (mm) |
ReH min (MPa) |
Rm (MPa) |
A5 min (%) |
KV min (J) at test temperature |
|---|---|---|---|---|
|
≤16 |
275 |
370–530 |
24 |
S275M: 40 J @ –20 °C S275ML: 27 J @ –50 °C |
|
16<t≤40 |
265 |
370–530 |
24 |
same |
|
40<t≤63 |
255 |
370–530 |
24 |
same |
|
63<t≤80 |
245 |
370–530 |
24 |
same |
|
80<t≤100 |
235 |
370–530 |
24 |
same |
|
100<t≤120 |
235 |
360–520 |
24 |
same |
|
120<t≤150 |
225 |
360–520 |
24 |
same |
|
150<t≤200 |
215–225* |
360–520 |
24 |
same |
Applications
S275M is great for general use, while S275ML is chosen for structures needing better performance in very cold conditions, like some construction or offshore parts.
Key Differences
Impact Test Temp: The 'L' denotes a lower temperature test, meaning S275ML performs better in extreme cold.
S275M: ≥ 40J at -20°C (longitudinal).
S275ML: ≥ 27J at -50°C (transverse/longitudinal).
Applications: S275M is great for general use, while S275ML is chosen for structures needing better performance in very cold conditions, like some construction or offshore parts.
Similarities (S275M & S275ML)
Strength: Both have a minimum yield strength of 275 MPa (N/mm²) and tensile strength around 400-530 MPa.
Manufacturing: Both are produced via Thermomechanical Controlled Processing (TMCP) for fine grain structure, enhancing weldability and toughness.
Weldability: Excellent, with low carbon equivalent (CEV), often requiring no preheat for thicknesses up to 100mm.
