S355M vs S355N EN 10025-4 Steel Plate Comparison Supplier

S355M vs S355N EN 10025-4 Steel Plate Comparison Supplier

Gangsteel – China's Leading Mill-Direct Supplier & Exporter of S355M and S355N EN 10025 Structural Steel Plates

Gangsteel is the professional supplier you can trust for both S355M (EN 10025-4 TMCP) and S355N (EN 10025-3 normalized) plates, with the largest combined stock in Asia – over 7,000 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.

S355M vs S355N – The Complete Technical Comparison

S355M and S355N are twin grades with identical nominal strength (355 MPa yield) and identical chemistry, but differ in delivery condition and manufacturing process.

Verdict from 15+ years experience: S355M (TMCP) is the clear winner 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.

S355N (normalized) is still chosen 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

S355M and S355N have exactly the same chemical requirements.

Ladle Analysis (max % unless noted)

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

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

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

*Gangsteel actual 295 MPa to 180 mm. Hardness 140–180 HBW. Full tables: S355ML Mechanical Properties EN 10025-4 Plate Supplier (same as S355N).

Weldability & Fabrication – S355M Has Clear Advantages

Both grades have excellent weldability (CEV ≤0.39 actual), but S355M'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: S355M allows higher heat input and faster welding speeds with the same or better weld quality.

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 the Market Has Shifted to S355M

In the last 5 years, S355M has taken 70–80 % market share from S355N 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

S355N is still used when the specification explicitly requires normalized delivery.

Why Choose Gangsteel for S355M and S355N 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: S355M vs S355N – which is better for offshore?

A: S355M (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 S355M.

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: S355M is 60–100 USD/ton higher than S355N, but the fabrication advantages usually make it the better value.

Q4: Z35 availability?

A: Yes – large stock of both S355M and S355N + Z35 ready.

Q5: Delivery time to Europe?

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

Contact Gangsteel

For S355M or S355N 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.