S355ML Plus EN 10025-4 Enhanced Steel Plate Supplier

 

 

S355ML Plus EN 10025-4 Enhanced Steel Plate Supplier

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.

 

What is S355ML Plus EN 10025-4 Enhanced Steel Plate?

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.

 

Chemical Composition – Ladle and Product Analysis Combined

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.

 

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

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.

 

Comparison Within the Standard

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.

 

Equivalent International Grades

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.

 

Applications & Design Considerations for S355ML Plus

Enhanced for Eurocode 3, 20% less steel.

• Offshore: Jackets, Plus Z35 tears; fatigue 10^8 cycles 140 MPa DNV-RP-C203.
• Cold Bridges: Girders, enhanced KV; HIC Class 1.
• Pipes: Penstocks, A5 3% drifts EN 1998-1; C4M <0.08 mm/yr epoxy.
• Fab: Booms, 3t radius; 55 yr ICCP.

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.

 

Why Choose Gangsteel for S355ML Plus

• 5,000+ t stock Plus variants.
• Mill-direct 80-140 USD/t save; >700 MT tiers.
• Process: laser ±0.3 mm, X-bevel, 150 mm bore, 450 mm roll, C5H 200 µm.
• Cert: ISO 9001/14001, NACE sour, EN 1090 EXC4.
• Legacy: Siemens 1,200+ t Plus (Hornsea), Total (Ichthys)—OTIF 100%.

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.

 

FAQ

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.

 

Contact Gangsteel

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.

 

Others property of en10025-4 s355ml steel plate