Product Overview

EN 10025-3 S355N Normalized Structural Steel Plate is manufactured according to EN 10025-3 for engineering applications requiring high strength, improved toughness, and reliable fabrication performance.

Technical Specifications

S355N Chemical Composition (Ladle Analysis)

Grade	C	Si	Mn	P	S	Ni	Cr
S355N	≤0.20≤0.20	0.20∼0.500.20∼0.50	1.20∼1.601.20∼1.60	≤0.025≤0.025	≤0.015≤0.015	≤0.30≤0.30	≤0.30≤0.30
Mo	Cu	Nb	V	Ti	Al (Total)	N	CEV Max
≤0.10≤0.10	≤0.30≤0.30	≤0.05≤0.05	≤0.08≤0.08	≤0.03≤0.03	≥0.015≥0.015	≤0.009≤0.009	≤0.42≤0.42

S355N Mechanical Properties

Grade	Product Form	Delivery Condition	Thickness (t,mm)	Test Parameters	Values	Remarks
S355N	Plate	Normalized	t≤16t≤16	Yield Strength (ReL)	≥355MPa
				Tensile Strength (Rm)	490∼630MPa
				Elongation (A)	≥22%
				Impact Temp / Energy	-20°C /≥40J	Longitudinal
				Bend Diameter	3a(a= thickness)
				Bend Angle	180°
				Sampling Note	Transverse sampling for tensile testing
S355N			16<t≤35	Yield Strength (ReL)	≥355MPa
				Tensile Strength (Rm)	490∼630MPa
				Elongation (A)	≥22%
				Impact Temp / Energy	-20°C /≥40J	Longitudinal
				Bend Diameter	3a(a= thickness)
				Bend Angle	180°
				Sampling Note	Transverse sampling for tensile testing
S355N			35<t≤50	Lower Yield Strength (ReL)	≥345MPa
				Tensile Strength (Rm)	490∼630MPa
				Elongation after Fracture (A)	≥22%
				Impact Test Temperature	-20°C
				Impact Energy (AKV)	≥40J
				Bending Mandrel Diameter	3a(a= thickness)	Longitudinal
				Bending Angle	180°
				Technical Note	Transverse sampling for tensile testing

Minimum Longitudinal V-Notch Charpy Impact Energy (Akv) For S355N (Normalized)

Grade	Minimum Impact Energy (J) at Test Temperature (°C)
	+20	0	-10	-20	-30	-40	-50
S355N	55	47	43	40	-	-	-

Minimum Transverse V-Notch Charpy Impact Energy (Akv) For S355N (Normalized)

Grade	Minimum Impact Energy (J) at Test Temperature (°C)
	+20	0	-10	-20	-30	-40	-50
S355N	31	27	24	20	-	-	-

Key Product Performance

Heat treated at 880–920°C to achieve a fine ferrite-pearlite grain structure (ASTM 8 or finer), delivering highly uniform mechanical properties across the entire length and thickness of each plate.

Delivers reliable longitudinal impact energy exceeding standard requirements at -20°C, helping mitigate brittle fracture risks in low-temperature operations.

Features a strictly controlled carbon equivalent (CEV ≤ 0.43%), simplifying field welding procedures, reducing preheating time, and minimizing cold cracking risks.

Applications & Processing Proof

Bridges & Structural Engineering: Proven application in welded bridge girders and heavy structural frameworks requiring sound notch toughness down to -20℃.

Wind Energy & Offshore Components: Suitable for onshore wind turbine base flanges, structural masts, and marine platform supports.

Heavy Machinery Fabrication: Ideal for crane booms, earthmoving equipment frames, and pressure-bearing welded structures requiring minimal cold cracking risks.

Inspection & Testing Capabilities

Mill Test Certificate (MTC): Issued strictly according to EN 10204 3.1 (EN 10204 3.2 available via independent inspectors: DNV, Lloyd's Register, SGS, TUV, Bureau Veritas).

Ultrasonic Testing (UT): 100% UT inspection available upon request compliant with EN 10160 (S1E1, S2E2, S3E3) or SEL 072.

System & Product Certifications: Factory operates under ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, and holds factory production control approval for CE Marking (EN 10025-1).

Packaging, Export Logistics & Deliverables

Surface Protection: Shot-blasted to Sa 2.5 and coated with weldable shop primer, or light oil coating for rust prevention during long-distance ocean freight.

Seaworthy Packaging: Heavy-duty steel bundling with protective edge guards, moisture-proof wrapping, and wooden skids for container or break-bulk vessel loading.

Processing Services: In-house CNC flame cutting, plasma cutting, beveling, and shot-blasting available according to customer engineering drawings.

Steel Marking & Traceability

Each delivered plate is clear-stenciled and die-stamped (hard stamped) with Heat Number, Plate Number, Grade (S355N), and Standard (EN 10025-3). This guarantees 100% material traceability back to the original ladle batch and Mill Test Certificate.

FAQ

Q: What is the lead time for standard sizes versus custom orders?

A: Standard sizes (10–50mm thickness) ship in 7–14 days from mill stock; custom dimensions or specific heat-treatment lots require 20–30 days.

Q: Can you accommodate third-party pre-shipment inspections?

A: Yes, we regularly coordinate with DNV, SGS, Bureau Veritas, or customer-appointed inspectors for dimensional, UT, and chemical re-testing prior to loading.

Q: What tolerance standards apply to plate thickness and flatness?

A: Plates are produced to EN 10029 Class B or C thickness tolerances and Class N or S flatness standards to ensure precise fit-up during automated fabrication.

Q: Do you offer value-added processing before shipment?

A: We provide in-house CNC flame cutting, beveling for weld preparation, drilling, and custom length shearing based on provided CAD drawings.

Q: How do you handle MOQ and mixed-dimension container orders?

A: Minimum order quantity starts at 5 tons per size, and we allow multi-thickness consolidation within a single 20ft or 40ft container to optimize ocean freight.

Q: How do you handle quality claims if the material fails secondary testing at the destination port?

A: All our shipments are backed by EN 10204 3.1/3.2 certificates. In the rare event of a quality discrepancy confirmed by an independent third-party lab (e.g., SGS), we provide immediate replacement or full credit compensation under our quality guarantee contract.

Q: Can you provide S355N plates with specific Z-testing (Z15, Z25, Z35 for through-thickness properties)?

A: Yes, we can supply S355N with guaranteed Z-direction properties according to EN 10164, ideal for heavily restrained welded joints in offshore and bridge applications.

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