S355ML NL EN 10025-4 Weldable Plate Supplier

 

 

S355ML NL EN 10025-4 Weldable Plate Supplier

Gangsteel – China's Leading Mill-Direct Supplier & Exporter of S355ML NL EN 10025-4 Weldable Low Temperature Structural Steel Plates

Gangsteel is the most reliable source for S355ML NL EN 10025-4 weldable plates, offering both S355ML (EN 10025-4 TMCP) and S355NL (EN 10025-3 normalized) with identical chemistry and mechanical properties optimized for outstanding weldability in low-temperature environments. We maintain combined stock exceeding 6,000 tons of S355ML and S355NL, covering thickness 6–200 mm, width 1500–4200 mm, length up to 18 meters. All plates are produced with very low CEV ≤0.39, guaranteeing no preheating up to 80 mm thickness even in field welding conditions.

Full certification package: EN 10204-3.1/3.2 MTCs, PED 2014/68/EU, CPR 305/2011, third-party inspection from DNV-GL, ABS, Lloyd’s Register, Bureau Veritas, CCS, RINA, KR, TÜV, or SGS. Z25/Z35 through-thickness quality in large stock, 100 % UT EN 10160 S2/E2 standard.

These plates are specifically designed for projects where weldability in cold conditions is critical – offshore wind turbine foundations, Arctic oil & gas structures, jack-up rigs, heavy mobile cranes, cold-region bridges, and penstocks in alpine areas.

Gangsteel has supplied S355ML/NL weldable plates to major projects worldwide, including Ørsted Hornsea, Equinor Johan Sverdrup, and Siemens Gamesa offshore wind farms. Immediate delivery worldwide in 3–7 days. Full processing services: plasma/oxy cutting, beveling, drilling, rolling, priming.

Explore our complete en 10025 4 High Strength Structural Steel series for all grades.

 

What is S355ML NL EN 10025-4 Weldable Plate?

S355ML (EN 10025-4) and S355NL (EN 10025-3) are twin grades with identical chemical composition and mechanical properties, both delivering 355 MPa minimum yield strength and ≥27 J impact toughness at –50 °C. The key difference is delivery condition:

• S355ML= Thermomechanically rolled (TMCP) – the modern, preferred method
• S355NL= Normalized or normalized rolled – the traditional method

Both are highly weldable low-temperature structural steels, but S355ML's TMCP process provides superior weldability characteristics due to lower residual stresses, finer grain structure, and better HAZ (heat-affected zone) toughness.

The outstanding weldability of S355ML/NL comes from:

• Very low CEV ≤0.39 (typical actual 0.34–0.37)
• Low carbon content (max 0.14 %, typical 0.10–0.12 %)
• Controlled P+S ≤0.035 % (typical ≤0.030 %)
• Fine grain structure from Al + Nb + V + Ti microalloying

This combination allows welding without preheating up to 80 mm thickness, even with high heat input processes like SAW (submerged arc welding). Preheating is only required for very thick plates or highly restrained joints, and even then only 75–100 °C maximum.

For detailed grade designation, see our guide S355ML Meaning EN 10025-4 Structural Steel Supplier.

 

Chemical Composition – Ladle Analysis and Product Analysis Combined

Both S355ML and S355NL have exactly the same chemical requirements.

Element	Ladle Max (%)	Product Deviation (%)	Typical Actual (%) – Gangsteel Stock	Role in Weldability
C	0.18	+0.02	0.10–0.14	Low C = excellent HAZ toughness
Si	0.50	+0.05	0.20–0.40	Deoxidizer
Mn	0.90–1.65	+0.10	1.20–1.50	Strength without cracking risk
P	0.025	+0.005	≤0.018	Very low for weld ductility
S	0.020	+0.005	≤0.012	Minimizes inclusions
Nb	0.05	+0.01	0.02–0.04	Grain refiner for fine HAZ
V	0.12	+0.02	0.05–0.10	Precipitation strengthening
Al min	0.020	+0.030	0.030–0.050	Strong deoxidizer for clean welds
Ti	0.05	+0.03	0.01–0.03	Nitride former
Cr	0.30	+0.05	≤0.25	Controlled
Ni	0.50	+0.05	≤0.40	Low-temp toughness
Mo	0.10	+0.03	≤0.08	HAZ improvement
Cu	0.55	+0.03	≤0.35	Minor
N	0.015	+0.003	≤0.010	Low for toughness
CEV max	0.43 (t≤63) / 0.45 (t>63)	N/A	0.35–0.40	Key weldability parameter

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

 

Mechanical Properties – Full Thickness Range up to 200 mm

Thickness (mm)	ReH min (MPa)	Rm (MPa)	A5 min (%)	KV min (J) at –50 °C longitudinal
≤16	355	470–630	22	27
16<t≤40	345	470–630	22	27
40<t≤63	335	470–630	22	27
63<t≤80	325	470–630	22	27
80<t≤100	315	470–630	22	27
100<t≤150	295–305	450–610	22	27
150<t≤200	275–295*	450–610	22	27

*Gangsteel actual 295 MPa to 180 mm. Hardness 140–180 HBW. Full tables: S355ML Mechanical Properties EN 10025-4 Plate Supplier

Weldability Advantages of S355ML/NL

Both grades have excellent weldability, but S355ML TMCP has clear advantages:

• Lower residual stress → less distortion
• Finer HAZ grain → higher toughness in weld zone
• No preheating up to 80 mm (even 100 mm in practice)
• Suitable for all welding processes: SMAW, SAW, FCAW, GMAW
• Low hydrogen cracking risk (CTOD >0.4 mm typical at –40 °C)

Gangsteel provides free welding recommendations and heat-specific data for WPS/PQR.

 

Available Specifications & Testing

• Thickness 6–200 mm
• Width 1500–4200 mm
• Length up to 18 m
• Z-quality Z25/Z35 in stock
• NDT 100 % UT EN 10160 S2/E2 (S3/E3 optional)
• All class approvals ex-stock

 

Why Choose Gangsteel for S355ML/NL Weldable Plates

• Combined stock 6,000+ tons both grades
• Factory-direct price – 60–120 USD/ton lower
• Full processing & Z35 in stock
• Immediate delivery worldwide
• Exported to 90+ countries

 

FAQ

Q1: S355ML vs S355NL weldability difference?A: S355ML (TMCP) has better HAZ toughness and lower distortion due to lower residual stress. S355NL (normalized) is slightly more traditional but excellent too. Both CEV ≤0.39, no preheat to 80 mm.

Q2: Which is better for field welding?A: S355ML – lower stress, less distortion, superior HAZ properties.

Q3: Price difference?A: S355NL is 60–100 USD/ton cheaper, but S355ML is preferred in 80 % of new projects for better fabrication performance.

Q4: Z35 availability?A: Yes – large stock of both S355ML and S355NL + Z35 ready.

Q5: Density and hardness?A: 7.85 g/cm³, 140–180 HBW for both.

Q6: Maximum thickness?A: 200 mm with full properties for both grades.

Q7: Delivery time?A: Stock material 3–7 days worldwide.

 

Contact Gangsteel

Need S355ML or S355NL weldable plates? Contact us for quotation within 2 hours.

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

Gangsteel – Weldable Low Temp Plates, Delivered Fast.

 

 

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