S355ML vs S355J2 EN 10025-4 Strength Comparison Supplier

 

 

S355ML vs S355J2 EN 10025-4 Strength Comparison Supplier

Gangsteel – China's Leading Mill-Direct Supplier & Exporter of S355ML vs S355J2 EN 10025-4 Strength Comparison Steel Plates

Gangsteel is the professional supplier you can trust for both S355ML (EN 10025-4 TMCP) and S355J2 (EN 10025-2 hot rolled) 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 both grades with Z35 through-thickness quality in stock, 100 % UT EN 10160 S2/E2 standard, and full documentation.

 

S355ML vs S355J2 – The Complete Strength & Performance Comparison

S355ML (EN 10025-4 TMCP) and S355J2 (EN 10025-2 hot rolled) are the two most commonly compared grades when engineers look for 355 MPa yield strength steel. Both have identical nominal yield and tensile strength, but differ significantly in delivery condition, low-temperature toughness, weldability, and overall performance in demanding applications.

Property	S355J2 (EN 10025-2)	S355ML (EN 10025-4 TMCP)	Winner & Reason
Delivery Condition	Hot rolled (as-rolled or normalized rolled possible)	Thermomechanical rolled (TMCP)	S355ML – lower residual stress, better flatness
Minimum Yield Strength ReH (MPa)	355 (≤16 mm) → 275 (>100 mm)	355 (≤16 mm) → 295–305 (>100 mm)	S355ML – much better thick plate strength
Tensile Strength Rm (MPa)	470–630 (all thicknesses)	470–630 (≤100 mm) → 450–610 (>100 mm)	Tie – same range
Elongation A5 min (%)	22	22	Tie
Impact Toughness (long.)	≥27 J at –20 °C	≥27 J at –50 °C	S355ML – far superior low-temp performance
CEV max	0.45–0.47 (depending on thickness)	0.39	S355ML – significantly better weldability
Preheat-free Welding (mm)	Up to 30–40 mm	Up to 80–100 mm	S355ML – huge fabrication advantage
Residual Stress	Higher (hot rolled)	Very low (TMCP)	S355ML – less distortion, better fatigue
Through-Thickness (Z35)	Possible but more difficult	Excellent (standard in thick plates)	S355ML
Fatigue Life	Good	20-30 % better (finer grain, lower stress)	S355ML
Price (November 2025)	Baseline	+100–150 USD/ton	S355J2 cheaper, but S355ML better value
Market Share (Offshore Wind)	10–20 %	80–90 %	S355ML dominates

Bottom line: If your project temperature is above –20 °C and budget is tight → S355J2 is acceptable. If you need –40 °C or –50 °C design temperature, better weldability without preheat, better thick-plate strength, or longer fatigue life → S355ML is the clear winner and has become the default choice in 90 % of new offshore wind and cold-region projects.

 

Chemical Composition – The Key to Different Performance

Element	S355J2 (EN 10025-2) max %	S355ML (EN 10025-4) max %	Difference & Impact
C	0.20	0.14	Lower C in S355ML = much better weldability & HAZ toughness
Si	0.55	0.50	Similar
Mn	1.60	1.60	Same
P	0.025	0.025	Same
S	0.025	0.020	Slightly lower in S355ML
Nb + V + Ti	0.17 (combined)	0.20 (combined)	Higher microalloying in S355ML for finer grain
CEV max	0.45 (t≤150 mm)	0.39 (all thicknesses)	S355ML CEV 15-20 % lower → dramatically better weldability

The lower CEV and higher microalloying in S355ML are what give it the superior properties despite identical nominal strength.

Full chemical data: S355ML Chemical Composition EN 10025-4 Supplier

 

Mechanical Properties – Thickness-by-Thickness Comparison

Thickness (mm)	S355J2 ReH min (MPa)	S355ML ReH min (MPa)	Difference
≤16	355	355	Same
>16 ≤40	345	345	Same
>40 ≤63	335	335	Same
>63 ≤100	315	315	Same
>100 ≤150	295	295–305	S355ML stronger
>150 ≤200	275–285	285–295	S355ML significantly strong

 

In thick plates (>100 mm), S355ML maintains much higher yield strength thanks to TMCP.

 

Why 90 % of New Offshore Projects Choose S355ML Over S355J2

• 15–25 % weight reduction possible
• No preheating for thick welds → faster fabrication
• Superior HAZ toughness → higher safety margin
• Better fatigue performance in dynamic loading
• Lower lifetime cost despite higher initial price

Why Choose Gangsteel for S355ML and S355J2 Plates

• Largest stock of both grades in Asia (8,000+ tons combined)
• Factory-direct price – 60–120 USD/ton lower than traders
• Full processing capability (cutting, beveling, drilling, rolling, priming)
• Z35 quality always in stock for both grades
• Immediate delivery worldwide
• Exported to 90+ countries with perfect documentation
• One-stop service – stock → processing → shipping

 

FAQ – Detailed Answers

Q1: What is the main difference between S355ML and S355J2?

A: S355ML is TMCP fine-grain steel with –50 °C impact toughness and much better weldability (CEV ≤0.39 vs S355J2 CEV up to 0.47). It also has better thick-plate strength and lower residual stress. S355J2 is traditional hot rolled steel with –20 °C impact.

Q2: Can I replace S355J2 with S355ML?

A: Yes – S355ML is a direct upgrade with better properties at a moderate price increase. Most engineers now specify S355ML as standard for new designs.

Q3: What is the price difference today?

A: S355ML is approximately 100–150 USD/ton higher than S355J2 (November 2025 market), but the weight saving and fabrication advantages usually make it cheaper overall.

Q4: Which one has better weldability?

A: S355ML – lower CEV and TMCP process give superior HAZ toughness and allow welding without preheating up to 80–100 mm thickness.

Q5: Which is better for offshore wind towers?

A: S355ML is now the industry standard for offshore wind (used in 90 % of new projects) due to –50 °C toughness and better fatigue performance.

Q6: Do you have both grades in stock?

A: Yes – very large stock of both S355J2 and S355ML in all common thicknesses, ready for immediate delivery.

Q7: Can you supply dual-certified plates?

A: Yes – many of our plates are dual-certified EN 10025-2 S355J2 and EN 10025-4 S355ML when the properties meet both standards.

Contact Gangsteel Today

Need S355ML 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 S355J2 and S355ML Plates.

 

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