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Gangsteel – China's Leading Mill-Direct Supplier & Exporter of S355ML Plus EN 10025-4 Enhanced Steel Plates
Gangsteel specializes in S355ML Plus EN 10025-4 enhanced steel plates, delivering upgraded variants with superior through-thickness properties, extended low-temperature performance, and optimized weldability for the most demanding structural applications.
As a thermomechanically rolled (TMCP) fine-grain structural steel under EN 10025-4:2004 (2019 revision), the "Plus" designation refers to enhancements like Z35 quality (≥35% reduction in area EN 10164 Class 3), sub-size impact testing for thick plates, and optional vacuum degassing for ultra-low P/S levels (<0.015/0.010%).
These enhancements make S355ML Plus ideal for high-risk welds in offshore jackets, seismic braces, or cryogenic vessels, where standard S355ML might not suffice.
We stock over 5,000 tons of S355ML Plus plates—thicknesses 6–200 mm, widths 1500–4200 mm, lengths up to 18 meters—produced by elite mills like HBIS and Shougang with full PED 2014/68/EU and CPR 305/2011 certification.
Each plate includes EN 10204-3.1/3.2 MTCs verifying enhanced properties, third-party inspections from DNV-GL, ABS, Lloyd's Register, Bureau Veritas, CCS, RINA, KR, TÜV, or SGS, and 100% UT EN 10160 S3/E3 for flaw detection.
At 7.85 g/cm³ density and 140-180 HBW hardness, S355ML Plus reduces sections 18-25% versus S355J2, with CEV ≤0.37 typical for preheat-free welding up to 100 mm.
Gangsteel customizes with plasma cutting (±0.4 mm), beveling (X/V 60°), drilling (150 mm dia.), rolling (ID 500 mm min), and C5H priming (200 µm DFT), ensuring seamless integration.
Fast 3–7 day delivery to 90+ countries positions us as your enhanced supplier.
Explore our en 10025 4 High Strength Structural Steel for the series.
For grade fundamentals, consult S355ML Meaning EN 10025-4 Structural Steel Supplier.
S355ML Plus under EN 10025-4:2004 (2019) denotes an enhanced version of the standard S355ML thermomechanically rolled (TMCP) weldable fine-grain structural steel, incorporating premium features like Z35 through-thickness ductility, refined microalloying for sub-zero extension, and advanced NDT for zero-defect assurance.
The base "S355ML" meaning—"S" for structural load-bearing, "355" nominal yield 355 MPa (transverse ≤16 mm), "M" TMCP delivery (900-1100 °C rolling + 20-40 °C/s cooling), "L" –50 °C ≥27 J KV (EN ISO 148-1)—is amplified in "Plus" variants with tighter CEV ≤0.37, Al ≥0.030% for finer grains (ASTM 7-9), and optional vacuum arc remelting (VAR) for S <0.010%.
This enhancement elevates S355ML Plus for ultra-critical welds, where standard Z25 (≥25% RA) falls short, per Norsok M-120 or Shell DEP 70.40.
TMCP's controlled austenite recrystallization, aided by Nb/V/Ti pinning, yields a ferrite-bainite matrix with KIc >150 MPa√m at –40 °C and CTOD >0.5 mm, surpassing S355QL (EN 10025-6) in distortion-free fabrication.
Density 7.85 g/cm³ and hardness 135-175 HBW optimize for FEA (bilinear 2% hardening), enabling 18-25% thinner sections in Eurocode 3 buckling (λ reduction via higher ReH).
Gangsteel "Plus" plates undergo extended KV (–60 °C opt) and HIC testing (NACE TM0284 Class 1), with MTCs including spectrographic verification.
For chemical details supporting these enhancements, see S355ML Chemical Composition EN 10025-4 Supplier; for mechanical, S355ML Mechanical Properties EN 10025-4 Plate Supplier.
Enhanced "Plus" tightens limits for superior HAZ.
|
Element |
Ladle Max (%) |
Product Deviation (%) |
Typical Actual (%) – Gangsteel "Plus" Stock |
Role in Enhanced Properties |
|---|---|---|---|---|
|
C |
0.14 |
+0.02 |
0.08–0.11 |
Ultra-low for premium weld HAZ |
|
Si |
0.50 |
+0.05 |
0.15–0.35 |
Optimized deoxidizer for fine grains |
|
Mn |
1.60 |
+0.10 |
1.10–1.40 |
Balanced for enhanced yield |
|
P |
0.025 |
+0.005 |
≤0.015 |
Min for Z35 cohesion |
|
S |
0.020 |
+0.005 |
≤0.010 |
VAR-low for inclusion-free KV |
|
Nb |
0.05 |
+0.01 |
0.025–0.045 |
Advanced pinning for sub-zero |
|
V |
0.10 |
+0.02 |
0.05–0.09 |
Enhanced precipitation |
|
Al min |
0.020 |
+0.030 (total) |
0.030–0.050 |
Premium grain refiner |
|
Ti |
0.05 |
+0.03 |
0.015–0.035 |
Nitride for isotropy |
|
Cr |
0.30 |
+0.05 |
0.08–0.20 |
Controlled for Rm stability |
|
Ni |
0.50 |
+0.05 |
0.25–0.45 |
Boosted for –60 °C opt |
|
Mo |
0.10 |
+0.03 |
≤0.04 |
HAZ premium |
|
Cu |
0.55 |
+0.03 |
0.15–0.30 |
Deoxidizer enhanced |
|
N |
0.015 |
+0.003 |
≤0.010 |
Low for clean enhanced matrix |
|
CEV max |
0.39 |
N/A |
0.30–0.36 |
Ultra-weld for "Plus" |
CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15. "Plus" VAR for S<0.010%. Full: S355ML Chemical Composition EN 10025-4 Supplier.
|
Thickness (mm) |
ReH min (MPa) |
Rm (MPa) |
A5 min (%) |
KV min (J, long. –50 °C) |
|---|---|---|---|---|
|
≤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≤120 |
305 |
450–610 |
22 |
27 |
|
120<t≤150 |
295 |
450–610 |
22 |
27 |
|
150<t≤200 |
285–295* |
450–610 |
22 |
27 |
*Agreement >150 mm; "Plus" Gangsteel 300 MPa to 180 mm. Hardness 135-175 HBW; density 7.85 g/cm³. Curves: S355ML Mechanical Properties EN 10025-4 Plate Supplier.
S355ML Plus vs. family.
|
Property/Grade |
S275M/ML |
S355M |
S355ML Plus |
S420M/ML |
|---|---|---|---|---|
|
Yield (MPa, ≤16 mm) |
275 |
355 |
355 |
420 |
|
Impact Temp (Long.) |
-20°C (M)/-50°C (ML) |
-20°C |
-50°C (opt –60 °C) |
-20°C (M)/-50°C (ML) |
|
Min KV (J) |
40/-20°C; 27/-50°C |
40/-20°C |
27/-50°C |
40/-20°C; 27/-50°C |
|
CEV Max |
0.38 |
0.39 |
0.37 |
0.43 |
|
Elong. A5 Min (%) |
24 |
22 |
22 |
19 |
|
Tensile (MPa) |
370-530 |
470-630 |
470-630 |
520-680 |
|
No-Preheat (mm) |
100 |
80 |
100 |
60 |
|
Wt Save vs S355J2 |
5-10% |
15-20% |
18-25% |
20-25% |
|
Cost + vs S355J2 (USD/t) |
+40-60 |
+80-120 |
+120-160 |
+150-200 |
|
Density (g/cm³) |
7.85 |
7.85 |
7.85 |
7.85 |
|
Apps |
Light frames |
Bridges |
Enhanced offshore |
Cranes |
|
Gangsteel Stock |
High |
V. High |
Highest |
Med |
S355ML Plus "enhanced" Z35/lower CEV; vs S355M, –50 °C KV; vs S275ML, 30% stronger; vs S420ML, ductility. See S355M vs S355ML EN 10025-4 Steel Plate Comparison Supplier.
Plus equivs with enhanced Z/KV.
|
Standard |
Equivalent Grade |
Key Match Notes |
Typical Use Case |
|---|---|---|---|
|
ASTM/ASME |
A572 Gr.50 + Z35 |
Yield 345 MPa; enhanced –50 °C |
U.S. enhanced bridges |
|
JIS G 3106 |
SM490A + Z35 |
Rm 490 MPa; ductility plus |
Japanese enhanced marine |
|
GB/T 1591 |
Q355E + Z35 |
Low-temp enhanced |
China-EN enhanced pipes |
|
API 2W |
Grade 50 + Z35 |
Offshore enhanced KV |
Enhanced platforms |
|
EN 10025-6 |
S355QL + Z35 |
QT enhanced; S355ML cheaper |
Enhanced heavy lifts |
Indicative; Plus TMCP HAZ better. Dual-cert. Full: S355ML Equivalent Material EN 10025-4 Plate Supplier.
Enhanced for Eurocode 3, 20% less steel.
Notes: Interpass 150°C; ER50-2. FEA Plus properties, 2% hardening. Eco: 97% recycle, 20% CO2 save. Gangsteel V-50°, UT S4. For weld, S355ML/NL Weldability EN 10025-4 Fine Grain Supplier; data S355ML Data Sheet EN 10025-4 Steel Properties Supplier.
To 92+ countries: Rotterdam 6 days. For specs, S355ML Specification EN 10025-4 Steel Plate Supplier; comparison S355ML vs S355J2 EN 10025-4 Strength Comparison Supplier.
Q1: What makes S355ML Plus enhanced?
A: Z35 (≥35% RA EN 10164 Cl.3), CEV ≤0.37, opt –60 °C KV, VAR for S<0.010%. For ultra-welds offshore; +20-30 USD/t vs std.
Q2: S355ML Plus vs S355M difference?
A: Impact: Plus –50 °C ≥27 J (opt –60 °C) for extreme cold; S355M –20 °C ≥40 J. Yield/chem/density same—Plus for < –20 °C (DNV-OS-B101). Gangsteel stocks both with enhanced MTCs.
Q3: Welding preheat for S355ML Plus?
A: None to 100 mm (CEV 0.30-0.37); low-H E7018 H4. Thicker: 60-110 °C (EN ISO 13916). TMCP low stress preserves Plus properties; saves 60 °C vs J2; CET per heat WPS.
Q4: S355ML Plus for pressure vessels?
A: Yes, PED III (EN 13445); derate >63 mm. UT S3/E3; RT opt seams. Plus KV/CTOD >0.5 mm aids fracture; cost-effective vs QT; dual ASME/EN.
Q5: Z35 in S355ML Plus?
A: Standard Z35 (≥35% RA EN 10164 Cl.3) for tension; Norsok M-120 welds; density neutral; +15-25 USD/t.
Q6: ASTM equiv for S355ML Plus?
A: A572 Gr.50 + Z35 enhanced; yield 345 MPa, –50 °C KV add. A633 Gr.C normalized; TMCP HAZ better. Dual-cert stocked for Plus match.
Q7: Custom S355ML Plus lead time?
A: Stock 1-3 days; processed 2-5 days; mill 3-5 weeks. 95% OTIF; air <10 MT 24-48 hrs; Plus properties verified MTC.
For S355ML Plus plates, quote now.
Email: admin@gangsteel.com WhatsApp/WeChat/Mobile: +86 135 9887 9167 Website: https://gangsteel.net/
Gangsteel—Enhanced Excellence, Engineered for You.
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