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Gangsteel – China's Leading Mill-Direct Supplier & Exporter of S355MLO vs S355J2 EN 10025 Steel Plates
Gangsteel is the professional supplier you can trust for both **S355MLO (EN 10025-4 offshore enhanced) and S355J2 (EN 10025-2) plates, with the largest combined stock in Asia – over 8,000 tons ready for immediate delivery in thickness 6–200 mm, width 1500–4200 mm, length up to 18 m. All plates are produced by top mills (HBIS, Shougang) with full European approvals and third-party inspection (DNV, ABS, LR, BV, CCS, KR, TÜV, SGS).
We supply S355MLO with full offshore certification package (CTOD, strain ageing, Z35 mandatory) in stock, alongside standard S355J2.
S355MLO and S355J2 are both 355 MPa yield strength structural steels, but they are designed for very different applications and have significant differences in low-temperature toughness, weldability, and overall performance in demanding environments.
|
Property |
S355J2 (EN 10025-2) |
S355MLO (EN 10025-4 Offshore Enhanced) |
Winner & Reason |
|---|---|---|---|
|
Standard |
EN 10025-2 (hot rolled structural) |
EN 10025-4 TMCP + offshore package |
S355MLO for modern offshore |
|
Delivery Condition |
Hot rolled or normalized rolled |
Thermomechanical rolled (TMCP) |
S355MLO – lower residual stress |
|
Low-Temperature Toughness |
≥27 J at –20 °C |
≥50 J average at –40/–50 °C + CTOD testing |
S355MLO – vastly superior for cold |
|
CEV max |
0.45–0.47 |
0.37 typical (enhanced) |
S355MLO – dramatically better weldability |
|
Preheat-free Welding (mm) |
Up to 30–40 mm |
Up to 100 mm |
S355MLO – huge fabrication advantage |
|
Through-Thickness (Z35) |
Optional, more difficult |
Mandatory + higher RA |
S355MLO – essential for offshore welds |
|
HAZ Toughness |
Standard |
Superior (finer grain + testing) |
S355MLO |
|
Fatigue Performance |
Good |
Excellent (lower stress + CTOD) |
S355MLO |
|
Price (November 2025) |
Baseline |
+200–300 USD/ton |
S355J2 cheaper, S355MLO better value in offshore |
|
Market Preference (Offshore Wind) |
<10 % |
>90 % |
S355MLO dominates |
Bottom line: S355J2 is a reliable, cost-effective grade for general structural applications where the lowest service temperature is above –20 °C.
S355MLO is the modern offshore grade that has almost completely replaced S355J2 in new offshore wind and oil & gas projects because of its superior low-temperature toughness, weldability, and through-thickness properties.
The price premium of S355MLO is easily recovered through:
|
Element |
S355J2 (EN 10025-2) max % |
S355MLO (EN 10025-4 enhanced) max % |
Difference & Impact |
|---|---|---|---|
|
C |
0.20 |
0.11 typical |
Much lower C in S355MLO = superior HAZ toughness |
|
Si |
0.55 |
0.35 typical |
Lower Si for better weldability |
|
Mn |
1.60 |
1.40 typical |
Optimized for strength |
|
P |
0.025 |
≤0.015 |
Lower P for better toughness |
|
S |
0.025 |
≤0.008 (VD standard) |
Ultra-low S for Z35 and CTOD |
|
Nb + V + Ti |
Limited |
Higher controlled microalloying |
Finer grain for superior properties |
The significantly tighter chemistry in S355MLO (especially C, P, S) is what enables the enhanced offshore properties.
Full chemical data: S355ML Chemical Composition EN 10025-4 Supplier
|
Property |
S355J2 (Standard) |
S355MLO (Offshore Enhanced) |
Notes |
|---|---|---|---|
|
Yield Strength ReH (MPa) |
355 (≤16 mm) → 275 (>100 mm) |
355 (≤16 mm) → 305–315 (>100 mm) |
S355MLO much better in thick plates |
|
Tensile Strength Rm (MPa) |
470–630 |
470–630 |
Same |
|
Elongation A5 (%) |
≥22 |
≥22 |
Same |
|
Impact Toughness (long.) |
≥27 J at –20 °C |
≥50 J average at –40/–50 °C + CTOD |
S355MLO vastly superior |
|
Z35 Reduction of Area |
Optional |
Mandatory + ≥40 % typical |
S355MLO essential for offshore welds |
S355MLO plates from Gangsteel routinely achieve impact values 120–200 J at –50 °C and CTOD 0.45–0.65 mm at –40 °C.
Full mechanical data: S355ML Mechanical Properties EN 10025-4 Plate Supplier
S355MLO's lower CEV and enhanced testing make it the best choice for high heat input welding in offshore fabrication.
No preheating required up to 100 mm thickness for S355MLO vs only 30–40 mm for S355J2.
|
Grade |
Price Level (November 2025) |
When to Choose |
|---|---|---|
|
S355J2 |
Baseline |
Onshore, mild climate, budget projects |
|
S355MLO |
+200–300 USD/ton |
Offshore wind, oil & gas, Arctic, high-risk welds |
The extra cost of S355MLO is easily recovered through faster fabrication, lower distortion, and higher safety.
Q1: Can I use S355J2 instead of S355MLO to save money?A: Not for offshore or low-temperature projects – the –20 °C impact toughness of S355J2 is insufficient for most modern offshore specifications.
Q2: What is the price difference?A: S355MLO is 200–300 USD/ton higher than S355J2, but the performance advantages make it the better choice for offshore projects.
Q3: Do you have S355MLO in stock?A: Yes – very large stock of S355MLO with full offshore certification ready for immediate delivery.
Q4: Can you supply both grades from the same heat for testing?A: Yes – we can supply dual-certified plates when properties meet both standards.
Need S355MLO or S355J2 plates? Contact us for quotation within 2 hours.
Email: admin@gangsteel.com WhatsApp/WeChat/Mobile: +86 135 9887 9167 Website: https://gangsteel.net/
Gangsteel – Your Expert for Both Standard and Offshore Grades.
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