EN10025-4 S355ML High Strength Steel Plate Supplier

EN10025-4 S355ML High Strength Steel Plate Supplier

Gangsteel – China's Leading Mill-Direct Supplier & Exporter of EN10025-4 S355ML High Strength Steel Plates

As a trusted global steel exporter specializing in premium structural materials, Gangsteel provides top-grade en 10025 4 s355ml steel platedirectly from our extensive 15,000+ ton inventory. EN10025-4 S355ML is a high-strength, fine-grain structural steel processed through TMCP (Thermomechanical Controlled Processing), offering a minimum yield strength of 355 MPa and reliable performance in demanding conditions. Available in thicknesses from 6 to 200 mm, widths up to 4200 mm, and lengths to 18 meters, our plates are produced by leading Chinese mills like HBIS and Baosteel, fully certified under PED 2014/68/EU and CPR 305/2011. Each order includes original EN 10204-3.1/3.2 mill test certificates, with third-party inspections from DNV-GL, ABS, Lloyd’s Register, Bureau Veritas, CCS, RINA, or KR to meet rigorous project specs.

In an industry where high-strength steels like S355ML are essential for lightweight yet robust designs—such as offshore platforms withstanding icy waves or bridges enduring heavy traffic loads—Gangsteel ensures you get the best value with fast delivery and competitive pricing. Our S355ML plates are optimized for weldability and toughness, helping reduce overall project weight by 15-20% compared to standard grades. Dive into our broader selection of en 10025 4 High Strength Structural Steel to see how S355ML fits into your engineering needs. With stock ready for immediate shipment, we're your one-stop supplier for EN10025-4 excellence.

What is EN10025-4 S355ML High Strength Steel Plate?

EN10025-4 S355ML is a thermomechanically rolled (TMCP) high-strength structural steel defined by the European standard EN10025-4:2004 (revised 2019), ideal for applications requiring superior strength and low-temperature impact resistance. The "S" stands for structural steel suitable for load-bearing elements; "355" indicates the nominal minimum yield strength of 355 MPa for plates up to 16 mm thick; "M" refers to the thermomechanical rolling process that controls deformation and cooling for a refined microstructure; and "L" specifies enhanced Charpy V-notch toughness of at least 27 Joules at -50°C longitudinally, making it perfect for cold climates.

The TMCP technique—hot rolling at 900-1100°C followed by precise cooling rates of 15-35°C/s—creates a fine ferrite-pearlite structure with dispersed carbides, enhancing ductility and fatigue life while keeping the carbon equivalent (CEV) low at ≤0.39. This allows for excellent weldability without preheating on sections up to 80 mm, outperforming normalized alternatives like S355NL in EN10025-3 by reducing distortion and improving through-thickness properties. Microalloying with elements like niobium and vanadium pins grain boundaries, achieving ASTM grain sizes of 8-10 for consistent performance under dynamic loads.

S355ML shines in weight-critical projects under Eurocode 3 (EN 1993-1-1), enabling thinner gauges that cut material costs and ease transport—up to 20% savings versus S355J2. It's a staple in offshore DNV-OS-C101 and seismic EN 1998-1 designs, from wind tower bases to pipeline supports. For a breakdown of its designation, visit S355ML Meaning EN 10025-4 Structural Steel Supplier. Gangsteel sources S355ML from mills with European approvals, ensuring traceability and quality for your high-stakes builds.

Chemical Composition (Ladle Analysis, % max unless noted)

S355ML's chemistry is fine-tuned for balance: low carbon for weld ease, controlled manganese for strength, and microadditions for grain control, all while minimizing impurities to prevent brittleness in cold service.

*CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15; actual CEV typically 0.31-0.37 supports flux-cored arc welding (FCAW) without cracking risks. Aluminum deoxidizes for oxide-free steel, while Nb/V form stable precipitates during TMCP cooling, boosting -50°C ductility. Compared to S355J2 (higher CEV ~0.45), S355ML cuts preheat needs by 50°C. For in-depth analysis, see S355ML Chemical Composition EN 10025-4 Supplier. Gangsteel offers vacuum-treated heats for S <0.008% in sensitive apps.

Mechanical Properties (Transverse Testing)

S355ML's TMCP delivery ensures a low yield ratio (<0.78), promoting even strain distribution and high energy absorption. Transverse values are guaranteed; longitudinal typically exceeds by 6-12%.

Vickers hardness: 135-175 HV. CTOD fracture toughness >0.4 mm at -40°C. Endurance limit: 170 MPa (2×10^6 cycles, R=0.5). These support 40+ year designs in C4 corrosion classes (ISO 12944). Gangsteel S355ML is UT-tested to EN 10160 S3/E3. Explore full curves in S355ML Mechanical Properties EN 10025-4 Plate Supplier.

Comparison of Materials Within the Standard

Within EN10025-4, S355ML balances cost and cold toughness as the bestseller. Here's a side-by-side with siblings—S275M/ML (entry), S355M (room-temp), S420M/ML (advanced)—on critical specs.

S355ML tops S355M for arctic use (-50°C KV vital for Norwegian platforms), at minor premium, while beats S275ML's 30% weaker yield for 12% slimmer builds. Vs. S420ML, it prioritizes ductility for vibration-heavy like wind bases. S355ML dominates 60% of EN10025-4 sales (Eurofer data). See S355M vs S355ML EN 10025-4 Steel Plate Comparison Supplier for more.

Equivalent International Grades

S355ML equivalents ease global compliance, with TMCP offering better weld consistency.

Indicative; confirm specs. Details in S355ML Equivalent Material EN 10025-4 Plate Supplier.

Applications & Design Considerations for S355ML

S355ML's high strength and -50°C resilience streamline Eurocode 3 fatigue checks, allowing 16-22% less steel in beams via higher allowable stresses.

• Renewables: Wind base rings (6-8 m dia.), KV preventing cracks from gusts; DNVGL-RP-C203 fatigue >10^7 cycles at 130 MPa.
• Arctic Infra: Support legs for LNG terminals, Z35 vs. tears in welds; HIC > Class 2 EEMUA 158.
• Seismic: Base isolators, A5 >22% for 3% drifts EN 1998-1; <0.07 mm/year corrosion C4M epoxy.
• Fab: Bent ducts, 3t radius cold; 55+ years ICCP marine.

Notes: Interpass 150°C HAZ; ER50-2 match. FEA bilinear 2% hardening. Eco: 97% recycle, 20% CO2 save TMCP. Gangsteel pre-V-groove 50° , UT S4.

Why Choose Gangsteel for Your S355ML Needs

Gangsteel excels:

• Stock Power: 5,500+ tons—96% 2-4 days ship.
• Price Edge: 70-120 USD/ton save; >700 MT tiers.
• Process Full: Laser ±0.4 mm, X-bevel, 140 mm bore, 500 mm roll, C5I 180 µm.
• Cert Strong: ISO 9001/14001, NACE sour, EN 1090 EXC3.
• Legacy: 1,500+ tons Vestas (Race Bank), BP (Kaskida), Fluor (Gorgon)—zero issues.

To 92+ countries: Felixstowe (6 days), Busan (8 days).

FAQ

Q1: What differentiates S355ML from S355M?

A: The key variance is impact toughness: S355ML guarantees ≥27J at -50°C, essential for sub-zero environments like offshore North Sea installations or Arctic pipelines, where sudden temperature drops could cause brittle failure. S355M, on the other hand, meets ≥40J at -20°C, suiting milder climates such as standard European construction sites. Both share identical yield strength (355 MPa min), tensile range (470-630 MPa), and chemical makeup, so the choice boils down to service temperature—opt for ML if your project spec (e.g., DNV-OS-B101 or EN 1991-1-4 for snow loads) demands below -20°C. At Gangsteel, we stock both for quick swaps, with full MTCs to verify compliance.

Q2: Is preheating required for welding S355ML?

A: Preheating is rarely necessary for S355ML due to its low CEV (typically 0.31-0.37 actual), which minimizes hydrogen cracking risks and allows cold starts on plates up to 70-80 mm thick using low-hydrogen electrodes like E7018 or ER50-0. For thicker sections (>80 mm) or highly restrained joints, a modest 70-120°C preheat is recommended per EN ISO 13916 to control cooling rates and preserve HAZ toughness. This is far less demanding than for higher-CEV grades like S355J2, potentially saving 10-15% on fabrication time and costs. We provide heat-specific CET/CEV data with every plate, along with tailored welding procedure specifications (WPS) to optimize your workflow—contact us for a free consultation.

Q3: Can S355ML be used in pressure vessel applications?

A: Yes, S355ML is well-suited for pressure equipment under PED Category III certification per EN 13445-2, particularly for non-cryogenic vessels where its low-temp toughness adds safety margins. Yield derating applies for thicknesses >63 mm (e.g., 305 MPa at 100 mm), but the grade's overstrength (actual ReH often 10% above min) compensates effectively. Include ultrasonic testing to EN 10160 S3/E3 and optional radiographic (RT) per EN 10228-3 for seam integrity in static designs. It's a cost-effective alternative to QT grades like S355QL for ambient-to-moderate pressure, reducing heat treatment needs. Gangsteel supplies PED-marked S355ML with full traceability, ideal for hybrid ASME VIII/EN codes—let's discuss your vessel specs.

Q4: How does S355ML pricing compare to S355J2?

A: S355ML typically carries a 100-140 USD/ton premium over S355J2 due to the TMCP process and -50°C impact testing, which enhance its suitability for harsh environments and justify the investment through 15-20% material savings from thinner sections. Current FOB Shanghai quotes hover at 700-800 USD/ton for 25 mm thick S355ML (Q4 2025 market), versus 600-700 for S355J2, but lifecycle analyses show S355ML's superior fatigue life (20-30% longer) and reduced maintenance offsetting the upfront cost in applications like wind towers. Factors like volume (>500 MT discounts 10-15%) and processing (e.g., Z35 add-on +20 USD/ton) influence final pricing. At Gangsteel, our mill-direct model shaves 50-80 USD/ton off trader rates—request a real-time quote tailored to your order size.

Q5: Do you offer Z35 through-thickness properties for S355ML?

A: Absolutely, Gangsteel maintains large stocks of S355ML with Z35 certification (≥35% reduction in area per EN 10164 Class 3), crucial for preventing lamellar tearing in tension-loaded welds like T-joints or gusset plates in offshore jackets. Z25 is standard (≥25% RA), but Z35 is available ex-stock for thicknesses 20-120 mm, adding minimal cost (15-25 USD/ton) while ensuring compliance with high-risk specs like Norsok M-120 or Shell DEP 70.40. This feature is especially valuable in seismic or fatigue-prone designs, where delamination could compromise safety. Our plates are mill-tested for Z-properties, with certificates included—browse our variants or inquire for custom Z-grades.

Q6: What is the ASTM equivalent for S355ML?

A: The closest ASTM equivalent to S355ML is A572 Grade 50 with Z35 through-thickness enhancement, matching the 355 MPa yield and offering similar weldability, though it requires additional low-temperature impact testing (-50°C) to fully align with S355ML's KV specs. For offshore use, A633 Grade C (normalized) is another parallel, providing comparable toughness but lacking TMCP's grain refinement for superior HAZ performance. Neither is a perfect 1:1 due to S355ML's European TMCP delivery, but both are accepted in AASHTO or AISC 360 with supplements. Gangsteel can supply dual-certified plates for US-EU hybrids—see S355ML Equivalent ASTM A633Gr.C EN 10025-4 Supplier for detailed crosswalks.

Q7: What is the typical lead time for custom S355ML orders?

A: For stock S355ML, lead time is 1-3 days from our warehouse, with global shipping via sea (e.g., 7 days to Rotterdam) or air for urgents (<10 MT in 24-48 hours). Custom processing like plasma cutting (±0.5 mm tolerance), beveling (K/V/X grooves), or priming adds 2-5 days, while new mill production for non-stock sizes runs 3-5 weeks. Factors like volume (>200 MT fast-tracks) and inspections (TÜV adds 1 week) influence timelines, but our 15,000+ ton buffer ensures 95% on-time delivery. Track via our portal, and we offer rush premiums for critical paths—share your project deadline for a precise ETA.

Contact Gangsteel for Competitive Quotes & Fast Shipment

Secure your EN10025-4 S355ML supply with Gangsteel—high strength, higher reliability.

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