Steel S355ML EN 10025-4 Fine Grain Plate Supplier

 

 

Steel S355ML EN 10025-4 Fine Grain Plate Supplier

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.

 

What is Steel S355ML EN 10025-4 Fine Grain Plate?

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:

• Minimum yield strength 355 MPa
• Guaranteed impact toughness ≥ 27 J at –50 °C (longitudinal)
• Very low CEV ≤ 0.39 → no preheating required up to 80 mm thickness
• Excellent through-thickness properties (Z25/Z35 available)
• Superior fatigue resistance and HAZ toughness

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.

 

Chemical Composition – Ladle Analysis and Product Analysis Combined

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

 

Mechanical Properties – Full Thickness Range up to 200 mm (Transverse)

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

• Gangsteel guarantees 295 MPa up to 180 mm, 285 MPa to 200 mm.

Hardness: 140–180 HBW Density: 7.85 g/cm³ Full mechanical tables: S355ML Mechanical Properties EN 10025-4 Plate Supplier

 

Available Specifications & Testing for Fine Grain S355ML

• Thickness: 6–200 mm (20–120 mm most common in stock)
• Width: 1500–4200 mm
• Length: up to 18 000 mm
• Fine grain guarantee: ASTM grain size 8–11 verified
• Z-quality: Z25 standard, Z35 large stock (reduction of area ≥35 %)
• NDT: 100 % ultrasonic testing EN 10160 S2/E2 (S3/E3 optional)
• Surface: shot-blasted + primer or mill finish
• Certification: EN 10204-3.1/3.2, PED, CPR, all major class approvals

 

Comparison Within EN 10025-4 Family – Fine Grain Grades

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

 

Why Choose Gangsteel for S355ML Fine Grain Plates

• Largest S355ML fine grain stock in Asia (5,000+ tons ready)
• Factory-direct price – 60–120 USD/ton lower than traders
• Full processing capability (cutting, beveling, drilling, rolling, priming)
• Z35 quality always in stock
• Immediate delivery worldwide
• Exported to 90+ countries with perfect documentation
• One-stop service – stock → processing → shipping

 

FAQ – Quick Answers

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.

 

Contact Gangsteel Today

Need S355ML fine grain plates? Contact us now for best price and fastest delivery.

Email: admin@gangsteel.com WhatsApp/WeChat/Mobile: +86 135 9887 9167 Website: https://gangsteel.net/

Gangsteel – Real Factory. Real Stock. Real Fine Grain Performance.

 

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