S355ML vs S355NL EN 10025-4 Low Temp Plate Supplier

 

 

S355ML vs S355NL EN 10025-4 Low Temp Plate Supplier

Gangsteel – China's Leading Mill-Direct Supplier & Exporter of S355ML and S355NL EN 10025 Low Temperature Structural Steel Plates

Gangsteel is the most experienced and reliable supplier for S355ML (EN 10025-4 TMCP) and S355NL (EN 10025-3 normalized) low temperature steel plates. We maintain combined stock exceeding 6,000 tons of both grades year-round, thickness 6–200 mm, width 1500–4200 mm, length up to 18 meters, with immediate availability and full certification.

Both grades deliver identical nominal strength (355 MPa yield) and identical low-temperature toughness (≥27 J at –50 °C), but differ in delivery condition, weldability, residual stress, and fabrication behaviour. This detailed comparison helps engineers make the optimal choice for offshore wind, Arctic structures, jack-up rigs, heavy cranes, and cold-region infrastructure.

We supply both S355ML and S355NL with Z35 through-thickness quality in stock, 100 % UT EN 10160 S2/E2 standard, and full documentation. Fast delivery worldwide in 3–7 days. Full processing services available.

 

S355ML vs S355NL – The Complete Technical Comparison

S355ML and S355NL are twin grades with the same chemical composition and mechanical properties. The only differences are in the manufacturing process and resulting material behaviour.

Property	S355NL (EN 10025-3)	S355ML (EN 10025-4)	Winner for Most Applications
Delivery Condition	Normalized or normalized rolled	Thermomechanical rolled (TMCP)	S355ML
Manufacturing Process	Separate normalizing heat treatment (880–920 °C + air cool)	Controlled rolling + accelerated cooling (no separate heat treatment)	S355ML (energy efficient, lower cost)
Residual Stress	Higher	Very low	S355ML
Flatness & Dimensional Tolerance	Good	Excellent (<3 mm/m)	S355ML
Weld HAZ Toughness	Good	Superior (finer grain in HAZ)	S355ML
Distortion in Fabrication	Higher	20-30 % lower	S355ML
Through-Thickness Properties	Good	Outstanding	S355ML
Production Cost	Higher	Lower	S355ML
Price (November 2025)	Baseline	+60–100 USD/ton	S355NL cheaper, S355ML better value
Market Preference (Offshore Wind)	20–30 %	70–80 %	S355ML

Verdict from 15+ years experience: S355ML (TMCP) is the superior choice for 90 % of modern projects due to lower residual stress, better flatness, superior HAZ properties, and easier fabrication. The small price premium is quickly recovered through reduced welding time, lower preheat requirements, and higher productivity.

S355NL (normalized) is still preferred when the specification explicitly requires normalizing or when the fabricator has traditional normalizing equipment for very thick plates (>150 mm) in controlled shop conditions.

Gangsteel produces both grades with identical chemistry and properties – you get the same high quality regardless of delivery condition.

 

Chemical Composition – Identical for Both Grades

S355ML and S355NL have exactly the same chemical requirements.

Ladle Analysis (max % unless noted)

Element	C	Si	Mn	P	S	Nb	V	Al min	Ti	Cr	Ni	Mo	Cu	N	CEV max
S355ML/S355NL	0.18	0.50	0.90–1.65	0.025	0.020	0.05	0.12	0.020	0.05	0.30	0.50	0.10	0.55	0.015	0.43 (t≤63 mm) / 0.45 (t>63 mm)

 

Product Analysis (deviations per EN 10025-1 Table 4)

Element	C	Si	Mn	P	S	Nb	V	Al total	Ti	Cr	Ni	Mo	Cu	N
Deviation	+0.02	+0.05	+0.10	+0.005	+0.005	+0.01	+0.02	+0.030	+0.03	+0.05	+0.05	+0.03	+0.03	+0.003

Typical Gangsteel actual values: C 0.10–0.14 %, CEV 0.35–0.40.

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

 

Mechanical Properties – Identical for Both Grades (Full Thickness Range)

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	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 & Fabrication – S355ML Has Clear Advantages

Both grades have excellent weldability (CEV ≤0.39 actual), but S355ML's TMCP delivery provides:

• Lower residual stress → less distortion after welding
• Finer HAZ grain → higher toughness in welded joints
• Better flatness → easier fit-up and alignment

Result: S355ML allows higher heat input and faster welding speeds with the same or better weld quality.

 

Why the Market Has Shifted to S355ML

In the last 5 years, S355ML has taken 70–80 % market share from S355NL in new projects because:

• Lower production cost (no separate normalizing)
• Better fabrication performance
• Superior properties in thick plates and welded joints
• Same or better price/performance ratio

S355NL is still used when the specification explicitly requires normalized delivery.

 

Why Choose Gangsteel for S355ML and S355NL 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 – which is better for offshore?

A: S355ML (TMCP) is now the preferred choice for offshore applications due to lower residual stress, better flatness, and superior HAZ toughness. Most new offshore wind projects specify S355ML.

Q2: Are the mechanical properties identical?

A: Yes – yield, tensile, elongation, and impact toughness are exactly the same. The difference is only in the manufacturing process and resulting fabrication behaviour.

Q3: Price difference?

A: S355ML is 60–100 USD/ton higher than S355NL, but the fabrication advantages usually make it the better value.

Q4: Z35 availability?

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

Q5: Delivery time to Europe?

A: Stock material 7–12 days to Rotterdam or Gdansk.

 

Contact Gangsteel

For S355ML or S355NL plates, quote now.

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

Gangsteel—Low Temp Expertise, Both Grades in Stock.

 

 

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