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S355M+Z35 EN 10025-4 Through-Thickness Plate Supplier

Gangsteel – China's Leading Mill-Direct Supplier & Exporter of S355M+Z35 EN 10025-4 Through-Thickness Plates

Gangsteel is the most reliable supplier for S355M+Z35 EN 10025-4 through-thickness plates, with the largest permanent stock in Asia – over 3,000 tons of S355M+Z35 always ready in thickness 10–200 mm, width 1500–4200 mm, length up to 18 meters. All plates are genuine TMCP produced by top mills (HBIS, Shougang) with full European approvals (PED 2014/68/EU, CPR 305/2011).

We supply S355M+Z35 with guaranteed Z35 quality (≥35 % reduction of area per EN 10164 Class 3), full EN 10204-3.1/3.2 certificates, third-party inspection (DNV, ABS, LR, BV, CCS, KR, TÜV, SGS), and 100 % UT EN 10160 S3/E3 standard.

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 S355M+Z35 EN 10025-4 Through-Thickness Plate?

S355M+Z35is a thermomechanically rolled (TMCP) weldable fine-grain structural steel under EN 10025-4:2004 (2019 revision) with additional Z35 through-thickness quality per EN 10164 Class 3.

S355M= structural steel, minimum yield 355 MPa, TMCP delivery, standard –20 °C impact
+Z35= guaranteed through-thickness ductility: minimum 35 % reduction of area (RA_z) in Z-direction tensile test (three specimens per heat, average ≥35 %, single ≥25 %)

Z35 quality prevents lamellar tearing in highly stressed welded joints where tension acts perpendicular to the plate surface (T-joints, cruciform welds, gusset plates, etc.).

S355M+Z35 is the preferred grade for:

Offshore wind jacket nodes and monopile transition pieces
Heavy crane booms and lifting equipment
Seismic-resistant building columns
Thick plate welded structures under high Z-direction stress

For the standard grade without Z35, see S355M EN 10025-4 Structural Plate Supplier.

Chemical Composition – Optimized for Z35 Quality

Element	Ladle Max (%)	Product Deviation (%)	Typical Actual (%) – Gangsteel Z35 Stock	Role in Z35 Performance
C	0.14	+0.02	0.08–0.11	Ultra-low C for clean HAZ
Si	0.50	+0.05	0.15–0.35	Deoxidizer
Mn	1.60	+0.10	1.10–1.40	Strength without Z-weakness
P	0.025	+0.005	≤0.015	Min P for Z-cohesion
S	0.010	+0.003	≤0.005 (VD/VAR standard)	Ultra-low S for Z35 RA
Nb	0.05	+0.01	0.025–0.045	Grain refiner for uniform Z
V	0.10	+0.02	0.05–0.09	Precipitation
Al min	0.020	+0.030	0.030–0.050	Deoxidizer for clean Z
Ti	0.05	+0.03	0.015–0.035	Nitride for Z-isotropy
Cr	0.30	+0.05	0.08–0.20	Controlled
Ni	0.50	+0.05	0.25–0.45	–20 °C Z-toughness
Mo	0.10	+0.03	≤0.04	HAZ Z-stability
Cu	0.55	+0.03	0.15–0.30	Deoxidizer
N	0.015	+0.003	≤0.010	Low for Z-cleanliness
CEV max	0.39	N/A	0.30–0.36	Ultra-weld for Z-joints

S ≤0.005 % + Ca treatment standard for Z35. Full: S355M 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. –20 °C)	Z35 RA min (%)
≤16	355	470–630	22	40	35
16<t≤40	345	470–630	22	40	35
40<t≤63	335	470–630	22	40	35
63<t≤80	325	470–630	22	40	35
80<t≤100	315	470–630	22	40	35
100<t≤120	305	450–610	22	40	35
120<t≤150	295	450–610	22	40	35
150<t≤200	285–295*	450–610	22	40	35

*Agreement >150 mm; Gangsteel 295 MPa to 180 mm. Hardness 140-180 HBW; density 7.85 g/cm³. Curves: S355M Mechanical Properties EN 10025-4 Plate Supplier.

Comparison Within the Standard

S355M+Z35 vs. family.

Property/Grade	S275M/ML	S355M	S355M+Z35	S420M/ML
Yield (MPa, ≤16 mm)	275	355	355	420
Impact Temp (Long.)	-20°C (M)/-50°C (ML)	-20°C	-20°C	-20°C (M)/-50°C (ML)
Min KV (J)	40/-20°C; 27/-50°C	40/-20°C	40/-20°C	40/-20°C; 27/-50°C
CEV Max	0.38	0.39	0.39	0.43
Elong. A5 Min (%)	24	22	22	19
Tensile (MPa)	370-530	470-630	470-630	520-680
No-Preheat (mm)	100	80	80	60
Wt Save vs S355J2	5-10%	15-20%	15-20%	20-25%
Cost + vs S355J2 (USD/t)	+40-60	+80-120	+100-140	+150-200
Density (g/cm³)	7.85	7.85	7.85	7.85
Apps	Light frames	Bridges	Z35 offshore	Cranes
Gangsteel Stock	High	V. High	Highest	Med

S355M+Z35 "Z35 enhanced"; vs S355M, through-thickness; vs S275ML, 30% stronger; vs S420ML, ductility. See S355M vs S355ML EN 10025-4 Steel Plate Comparison Supplier.

Equivalent International Grades

Z35 equivs.

Standard	Equivalent Grade	Key Match Notes	Typical Use Case
ASTM/ASME	A572 Gr.50 + Z35	Yield 345 MPa; Z35 –20 °C	U.S. Z35 bridges
JIS G 3106	SM490A + Z35	Rm 490 MPa; ductility Z35	Japanese Z35 marine
GB/T 1591	Q355C + Z35	Standard Z35	China-EN Z35 pipes
API 2W	Grade 50 + Z35	Offshore Z35 KV	Z35 platforms
EN 10025-6	S355QL + Z35	QT Z35; S355M cheaper	Heavy Z35 lifts

Indicative; TMCP Z35 better. Dual-cert. Full: S355ML Equivalent Material EN 10025-4 Plate Supplier.

Applications & Design Considerations for S355M+Z35

Z35 for Eurocode 3, 20% less steel in welds.

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

Notes: Interpass 150°C; ER50-2. FEA Z35 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 S355M+Z35

3,000+ t Z35 stock.
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 Z35 (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.

Summary

S355M+Z35 EN 10025-4 plates from Gangsteel provide guaranteed Z35 through-thickness ductility (RA_z ≥35%), 355 MPa yield, –20 °C toughness, and TMCP weldability for critical structural welds in offshore, seismic, and heavy fabrication. Stocked in 6–200 mm with full certification, Z35 eliminates lamellar tearing risk where standard Z25 fails. Contact for immediate supply.

FAQ

Q1: What is Z35 in S355M?

A: Z35 = ≥35% reduction of area in Z-direction tensile test (EN 10164 Cl.3), preventing lamellar tearing in welds under perpendicular stress. Mandatory for T-joints in offshore jackets.

Q2: S355M+Z35 vs S355M difference?

A: Z35 adds through-thickness guarantee (RA_z ≥35%); standard S355M is Z25 (≥25%). Yield/impact same—Z35 for high-risk welds.

Q3: Welding preheat for S355M+Z35?

A: None to 80 mm (CEV 0.30-0.37); low-H E7018 H4. Thicker: 60-110 °C (EN ISO 13916). TMCP preserves Z35 in HAZ.

Q4: S355M+Z35 for pressure vessels?

A: Yes, PED III (EN 13445); derate >63 mm. UT S3/E3; RT opt seams. Z35 aids nozzle welds.

Q5: Z35 price premium?

A: +20-40 USD/t vs standard S355M; included in our Z35 stock.

Q6: ASTM equiv for S355M+Z35?

A: A572 Gr.50 + Z35; yield 345 MPa, Z35 –20 °C. Dual-cert stocked.

Q7: Custom S355M+Z35 lead time?

A: Stock 1-3 days; processed 2-5 days; mill 3-5 weeks. 95% OTIF; air <10 MT 24-48 hrs.

Contact Gangsteel

For S355M+Z35 plates, quote now.

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

Gangsteel—Z35 Guaranteed, Delivered Direct.

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