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Gangsteel – China's Leading Mill-Direct Supplier & Exporter of Steel S355ML EN 10025-4 Fine Grain Plates
Gangsteel is the professional and authoritative supplier for Steel S355ML EN 10025-4 fine grain plates, with the largest ready stock in Asia – over 5,000 tons permanently available in thickness 6–200 mm, width 1500–4200 mm, length up to 18 meters. All plates are genuine TMCP fine grain produced by top mills (HBIS, Shougang) with full European PED/CE approval.
Every plate comes with original EN 10204-3.1/3.2 certificates, third-party inspection (DNV, ABS, LR, BV, CCS, KR, TÜV, SGS), Z25/Z35 through-thickness quality in stock, and 100 % ultrasonic testing EN 10160 S2/E2 standard.
Immediate delivery worldwide in 3–7 days. Full processing services available.
Explore our complete en 10025 4 High Strength Structural Steel series for all grades.
Steel S355ML is a thermomechanically rolled (TMCP) weldable fine grain structural steel specified in EN 10025-4:2004 (current version 2019).
The "fine grain" designation is the key feature: the TMCP process combined with microalloying (Nb, V, Ti) produces a very fine-grained microstructure (ASTM grain size 8–11),which is the reason for S355ML's excellent combination of high strength, superior low-temperature toughness, and outstanding weldability.
Key material characteristics of S355ML fine grain steel:
The fine grain structure is what sets S355ML apart from conventional hot-rolled grades like S355J2. It provides better resistance to brittle fracture, better weldability, and higher fatigue life – making it the preferred material for offshore wind towers, Arctic structures, jack-up rigs, and heavy cranes where safety margins in cold conditions are non-negotiable.
For detailed grade designation explanation, see our article S355ML Meaning EN 10025-4 Structural Steel Supplier.
The fine grain structure of S355ML is achieved through controlled chemistry and TMCP.
|
Element |
Ladle Max (%) |
Product Deviation (%) |
Typical Actual (%) – Gangsteel Stock |
Role in Fine Grain Structure |
|---|---|---|---|---|
|
C |
0.14 |
+0.02 |
0.09–0.12 |
Low C for weldability & HAZ toughness |
|
Si |
0.50 |
+0.05 |
0.20–0.40 |
Deoxidizer |
|
Mn |
1.60 |
+0.10 |
1.20–1.50 |
Strength without coarsening grains |
|
P |
0.025 |
+0.005 |
≤0.018 |
Low for cleavage resistance |
|
S |
0.020 |
+0.005 |
≤0.015 |
Low inclusions for KV values |
|
Nb |
0.05 |
+0.01 |
0.02–0.04 |
Primary grain refiner (NbC pinning) |
|
V |
0.10 |
+0.02 |
0.04–0.08 |
Precipitation & grain control |
|
Al min |
0.020 |
+0.030 (total) |
0.025–0.045 |
Strong deoxidizer & grain refiner |
|
Ti |
0.05 |
+0.03 |
0.01–0.03 |
TiN particles pin austenite grains |
|
Cr |
0.30 |
+0.05 |
0.10–0.25 |
Controlled for balanced properties |
|
Ni |
0.50 |
+0.05 |
0.20–0.40 |
Improves low-temp toughness |
|
Mo |
0.10 |
+0.03 |
≤0.05 |
Minor HAZ improvement |
|
Cu |
0.55 |
+0.03 |
0.20–0.35 |
Deoxidizer |
|
N |
0.015 |
+0.003 |
≤0.012 |
Low for clean steel matrix |
|
CEV max |
0.39 |
N/A |
0.32–0.38 |
Excellent weldability |
The combination of low carbon, Al + Nb + V + Ti microalloying, and TMCP is what creates the fine grain designation and superior properties of S355ML.
Full chemical details: S355ML Chemical Composition EN 10025-4 Supplier
|
Thickness (mm) |
ReH min (MPa) |
Rm (MPa) |
A5 min (%) |
KV min (J) at –50 °C longitudinal |
|---|---|---|---|---|
|
≤ 16 |
355 |
470–630 |
22 |
27 |
|
>16 ≤ 40 |
345 |
470–630 |
22 |
27 |
|
>40 ≤ 63 |
335 |
470–630 |
22 |
27 |
|
>63 ≤ 80 |
325 |
470–630 |
22 |
27 |
|
>80 ≤ 100 |
315 |
470–630 |
22 |
27 |
|
>100 ≤ 120 |
305 |
450–610 |
22 |
27 |
|
>120 ≤ 150 |
295 |
450–610 |
22 |
27 |
|
>150 ≤ 200 |
285–295* |
450–610 |
22 |
27 |
Hardness: 140–180 HBW Density: 7.85 g/cm³ Full mechanical tables: S355ML Mechanical Properties EN 10025-4 Plate Supplier
|
Grade |
Yield (≤16 mm) |
Impact Temp |
CEV max |
Preheat-free (mm) |
Fine Grain Level |
Typical Use |
|---|---|---|---|---|---|---|
|
S275M/ML |
275 MPa |
–20 / –50 °C |
0.38 |
up to 100 |
Very fine |
Light structures |
|
S355M |
355 MPa |
–20 °C |
0.39 |
up to 80 |
Very fine |
Bridges, machinery |
|
S355ML |
355 MPa |
–50 °C |
0.39 |
up to 80 |
Very fine |
Offshore wind, Arctic |
|
S420M/ML |
420 MPa |
–20 / –50 °C |
0.43 |
up to 60 |
Very fine |
Heavy cranes |
|
S460M/ML |
460 MPa |
–20 / –50 °C |
0.46 |
up to 50 |
Very fine |
High-rise, heavy lifting |
S355ML offers the best combination of fine grain properties, low-temp toughness, and weldability in the standard.
Full comparison: S355M vs S355ML EN 10025-4 Steel Plate Comparison Supplier
Q1: What makes S355ML "fine grain"?A: The combination of low carbon, Al + Nb + V + Ti microalloying, and TMCP process produces ASTM grain size 8–11, which is the definition of "fine grain" and the reason for its superior toughness and weldability.
Q2: S355ML vs S355M difference?A: Only impact test temperature. S355ML = –50 °C (≥27 J), S355M = –20 °C (≥40 J). All other properties identical.
Q3: Preheating required?A: No preheat up to 80 mm thickness. >80 mm: 75–100 °C max.
Q4: Z35 availability?A: Yes – very large stock of S355ML + Z35 ready for immediate delivery.
Q5: Density and hardness?A: Density 7.85 g/cm³, hardness 140–180 HBW.
Q6: NDT standard?A: 100 % UT EN 10160 S2/E2 included. S3/E3, MT, PT on request.
Q7: Maximum thickness?A: Up to 200 mm with full fine grain properties and certification.
Need S355ML fine grain plates? Contact us now for best price and fastest delivery.
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