Material S355M EN 10025-4 Thermomechanical Supplier

Material S355M EN 10025-4 Thermomechanical Supplier

Gangsteel – China's Leading Mill-Direct Supplier & Exporter of Material S355M EN 10025-4 Thermomechanical Plates

Gangsteel is the most reliable and professional supplier for Material S355M EN 10025-4 thermomechanical plates, with the largest permanent stock in Asia – over 4,000 tons always ready in thickness 6–200 mm, width 1500–4200 mm, length up to 18 meters. All plates are genuine thermomechanical controlled process (TMCP) produced by top Chinese mills (HBIS, Shougang, Nanjing Steel) with full European approvals (PED 2014/68/EU, CPR 305/2011).

We supply with original EN 10204-3.1/3.2 certificates and third-party inspection (DNV-GL, ABS, LR, BV, CCS, KR, TÜV, SGS). Z25/Z35 through-thickness quality in stock, 100 % ultrasonic testing EN 10160 S2/E2 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 Material S355M EN 10025-4 Thermomechanical?

Material S355Mis a thermomechanically rolled (TMCP) weldable fine-grain structural steel specified in EN 10025-4:2004 (current version 2019).

The designation “S355M” means:

• S= structural steel
• 355= minimum yield strength 355 MPa (transverse, thickness ≤ 16 mm)
• M= thermomechanical rolling (TMCP delivery condition – controlled hot rolling + accelerated cooling, no separate normalizing)

The thermomechanical (TMCP) process is what makes S355M special: it achieves the required fine grain structure and mechanical properties during the rolling process itself, without any additional heat treatment. This gives S355M:

• Lower residual stress than normalized grades
• Excellent flatness and dimensional stability
• Superior weldability (CEV ≤ 0.39)
• Better fatigue performance and HAZ toughness

S355M is the standard-temperature grade in the EN 10025-4 family (–20 °C impact toughness). It is the direct TMCP alternative to normalized S355N (EN 10025-3) and the sister grade to the low-temperature bestseller S355ML (–50 °C).

For detailed grade designation explanation, see our article S355M Meaning EN 10025-4 Structural Grade Supplier.

Chemical Composition – Ladle Analysis (max % unless noted)

Typical Gangsteel actual values: C 0.09–0.12 %, CEV 0.34–0.37 → excellent weldability without preheating up to 80 mm thickness.

Full chemical details: S355M Chemical Composition EN 10025-4 Supplier

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

*Gangsteel guarantees 295 MPa up to 180 mm, 285 MPa to 200 mm.

Hardness: 140–180 HBW Density: 7.85 g/cm³

Full mechanical tables: S355M Mechanical Properties EN 10025-4 Plate Supplier

Available Specifications & Testing

• Thickness: 6–200 mm (20–120 mm most popular in stock)
• Width: 1500–4200 mm
• Length: up to 18 000 mm
• Z-quality: Z25 standard, Z35 large stock
• NDT: 100 % ultrasonic testing EN 10160 S2/E2 (S3/E3 optional)
• Surface: shot-blasted + primer or mill finish
• Certification: EN 10204-3.1/3.2, PED, CPR, all major class approvals

Applications of S355M Thermomechanical Material

S355M is widely used when the service temperature is above –20 °C:

• General structural engineering
• Bridges and highway structures
• Onshore wind turbine towers
• Heavy machinery bases
• Crane booms and lifting equipment
• Shipbuilding and marine structures (non-Arctic)

When the temperature drops below –20 °C, the low-temperature version S355ML is required.

Why Choose Gangsteel for S355M Thermomechanical Material

• Largest S355M thermomechanical stock in Asia (4,000+ tons ready)
• Factory-direct price – 60–120 USD/ton lower than traders
• Full processing capability (cutting, beveling, drilling, rolling, priming)
• Z35 quality always in stock
• Immediate delivery worldwide
• Exported to 90+ countries with perfect documentation
• One-stop service – stock → processing → shipping

FAQ – Detailed Answers

Q1: What does the “M” in S355M mean?

A: “M” stands for thermomechanical rolling (TMCP) – the controlled rolling and cooling process that gives S355M its fine grain structure and excellent properties without separate normalizing heat treatment.

Q2: S355M vs S355ML difference?

A: The only difference is the impact test temperature. S355M is tested at –20 °C with minimum 40 J (longitudinal), while S355ML is tested at –50 °C with minimum 27 J. Yield strength, tensile strength, elongation, chemical composition, and weldability are exactly the same.

Q3: Is preheating required when welding S355M?

A: No preheating is required up to 80 mm thickness thanks to the very low CEV (typically 0.34–0.37 actual). For thicknesses over 80 mm or highly restrained joints, a modest preheat of 75–100 °C is sufficient.

Q4: Do you have Z35 quality in stock for S355M?

A: Yes – we keep very large stock of S355M + Z35 (reduction of area ≥35 % per EN 10164 Class 3), especially in 20–120 mm thickness, ready for immediate delivery.

Q5: What is the density and hardness of S355M?

A: Density is 7.85 g/cm³ (7850 kg/m³), hardness is 140–180 HBW (typical 150–170 HBW in our stock). These values are consistent across the entire thickness range.

Q6: What NDT do you provide as standard?

A: 100 % ultrasonic testing to EN 10160 S2/E2 is included with every plate. We can upgrade to S3/E3, magnetic particle (MT), or penetrant testing (PT) on request at no extra charge for reasonable quantities.

Q7: How fast can you deliver to Europe or USA?

A: From ready stock: 7–12 days to Rotterdam, Antwerp, Houston, or Los Angeles. We have regular consolidation containers and can offer air freight for urgent small quantities (<10 tons) in 48–72 hours.

Contact Gangsteel Today

Need S355M thermomechanical material? Contact us now for best price and fastest delivery.

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

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