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Gangsteel – China's Leading Mill-Direct Supplier & Exporter of S355ML+Z35 EN 10025-4 Through-Thickness Steel Plates
Gangsteel is the global authority for S355ML+Z35 EN 10025-4 through-thickness steel plates, delivering Z35 quality (≥35% reduction of area) as standard stock to eliminate lamellar tearing in critical welded joints. As a thermomechanically rolled (TMCP) weldable fine-grain structural steel under EN 10025-4:2004 (2019 revision), S355ML+Z35 combines 355 MPa minimum yield strength, ≥27 J at –50 °C impact toughness, and guaranteed through-thickness ductility per EN 10164 Class Z35—essential for T-joints, cruciform welds, and tension-loaded connections in offshore jackets, monopiles, and seismic structures.
We stock over 5,000 tons of S355ML+Z35 plates in thicknesses 6–200 mm, widths 1500–4200 mm, and lengths up to 18 meters, produced by premium 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 Z35 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 testing for zero internal flaws.
Z35 through-thickness quality prevents delamination under high Z-direction stress (σz > 0.5 fy), common in thick-plate welds where standard Z25 (≥25% RA) is insufficient. S355ML+Z35 achieves this via controlled sulfur (S ≤0.010%), clean steel practice (vacuum degassing), and TMCP's uniform microstructure. At 7.85 g/cm³ density and 140-180 HBW hardness, it supports 15-20% weight reduction versus S355J2+Z35 while meeting Norsok M-120 and DNV-OS-B101. Gangsteel customizes with beveling (X/V 60°), drilling, rolling, and priming. Fast 3–7 day delivery to 90+ countries. Explore our en 10025 4 High Strength Structural Steel series. For grade basics, S355ML Meaning EN 10025-4 Structural Steel Supplier.
S355ML+Z35 under EN 10025-4:2004 (2019) + EN 10164 is S355ML TMCP steel with Z35 through-thickness quality—minimum 35% reduction of area (RA) in Z-direction tensile tests, preventing lamellar tearing in welds under perpendicular stress. "S355ML" means structural (S), 355 MPa yield, TMCP (M), low-temp –50 °C (L); "+Z35" adds EN 10164 Class Z35 for three specimens per heat: RA_z ≥35% average, ≥25% single.
Through-thickness (Z-direction) properties counter plane-strain delamination from inclusions (MnS) elongated during rolling. Z35 requires ultra-low sulfur (S ≤0.010%, often <0.005% via VD/VAR), calcium treatment for globular inclusions, and TMCP's compressive reduction to refine Z-ductility. S355ML+Z35 achieves RA_z 40-55% typical, vs Z25 25-40%, enabling safe T/K/Y joints where σz > 200 MPa.
Test per EN 10164: round bar (d=10 mm) from plate mid-thickness, pulled perpendicular to surface; failure ductile cup-cone. Critical for offshore (DNV-OS-C101 §7), seismic (EN 1998-1), and pressure vessels (EN 13445). Gangsteel verifies Z35 on every heat, with MTCs showing RA_z values. For chemical enabling Z35, S355ML Chemical Composition EN 10025-4 Supplier; mechanical, S355ML Mechanical Properties EN 10025-4 Plate Supplier.
|
Element |
Ladle Max (%) |
Product Deviation (%) |
Typical Actual (%) – Gangsteel Z35 Stock |
Role in Z35 Through-Thickness |
|---|---|---|---|---|
|
C |
0.14 |
+0.02 |
0.08–0.11 |
Low C for HAZ ductility |
|
Si |
0.50 |
+0.05 |
0.15–0.35 |
Deoxidizer |
|
Mn |
1.60 |
+0.10 |
1.10–1.40 |
Strength without Z-weakness |
|
P |
0.020 |
+0.005 |
≤0.015 |
Min P for Z-cohesion |
|
S |
0.010 |
+0.003 |
≤0.005 (VD 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 |
Low-temp 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 |
Weld for Z-joints |
S ≤0.005% + Ca treatment standard for Z35. Full: S355ML Chemical Composition EN 10025-4 Supplier.
|
Thickness (mm) |
ReH min (MPa) |
Rm (MPa) |
A5 min (%) |
KV min (J, long. –50 °C) |
Z35 RA min (%) |
|---|---|---|---|---|---|
|
≤16 |
355 |
470–630 |
22 |
27 |
35 |
|
16<t≤40 |
345 |
470–630 |
22 |
27 |
35 |
|
40<t≤63 |
335 |
470–630 |
22 |
27 |
35 |
|
63<t≤80 |
325 |
470–630 |
22 |
27 |
35 |
|
80<t≤100 |
315 |
470–630 |
22 |
27 |
35 |
|
100<t≤120 |
305 |
450–610 |
22 |
27 |
35 |
|
120<t≤150 |
295 |
450–610 |
22 |
27 |
35 |
|
150<t≤200 |
285–295* |
450–610 |
22 |
27 |
35 |
*Agreement >150 mm; Gangsteel 295 MPa to 180 mm. Hardness 140-180 HBW; density 7.85 g/cm³. Curves: S355ML Mechanical Properties EN 10025-4 Plate Supplier.
S355ML+Z35 vs. family.
|
Property/Grade |
S275M/ML |
S355M |
S355ML+Z35 |
S420M/ML |
|---|---|---|---|---|
|
Yield (MPa, ≤16 mm) |
275 |
355 |
355 |
420 |
|
Impact Temp (Long.) |
-20°C (M)/-50°C (ML) |
-20°C |
-50°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 |
0.39 |
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 |
+120-160 |
+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 |
S355ML+Z35 "Z35 enhanced"; vs S355M, –50 °C KV; vs S275ML, 30% stronger; vs S420ML, ductility. See S355M vs S355ML EN 10025-4 Steel Plate Comparison Supplier.
Z35 equivs.
|
Standard |
Equivalent Grade |
Key Match Notes |
Typical Use Case |
|---|---|---|---|
|
ASTM/ASME |
A572 Gr.50 + Z35 |
Yield 345 MPa; Z35 –50 °C |
U.S. Z35 bridges |
|
JIS G 3106 |
SM490A + Z35 |
Rm 490 MPa; ductility Z35 |
Japanese Z35 marine |
|
GB/T 1591 |
Q355E + Z35 |
Low-temp Z35 |
China-EN Z35 pipes |
|
API 2W |
Grade 50 + Z35 |
Offshore Z35 KV |
Z35 platforms |
|
EN 10025-6 |
S355QL + Z35 |
QT Z35; S355ML cheaper |
Heavy Z35 lifts |
Indicative; TMCP Z35 better. Dual-cert. Full: S355ML Equivalent Material EN 10025-4 Plate Supplier.
Z35 for Eurocode 3, 20% less steel in welds.
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.
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.
S355ML+Z35 EN 10025-4 plates from Gangsteel provide guaranteed Z35 through-thickness ductility (RA_z ≥35%), 355 MPa yield, –50 °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.
Q1: What is Z35 in S355ML?
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: S355ML+Z35 vs S355ML difference?
A: Z35 adds through-thickness guarantee (RA_z ≥35%); standard S355ML is Z25 (≥25%). Yield/impact same—Z35 for high-risk welds.
Q3: Welding preheat for S355ML+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: S355ML+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 S355ML; included in our Z35 stock.
Q6: ASTM equiv for S355ML+Z35?
A: A572 Gr.50 + Z35; yield 345 MPa, Z35 –50 °C KV add. Dual-cert stocked.
Q7: Custom S355ML+Z35 lead time?
A: Stock 1-3 days; processed 2-5 days; mill 3-5 weeks. 95% OTIF; Z35 verified MTC.
For S355ML+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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