S355J2W Weathering Steel to EN 10025-5
S355J2W, also identified by material number 1.8965, is a hot-rolled structural weathering-steel grade. EN 10025-5 sets its technical delivery requirements, including chemical composition and mechanical properties.
The grade designation describes the material: S identifies structural steel, 355 indicates the yield-strength level for the applicable lower thickness range, J2 identifies impact quality, and W indicates improved atmospheric-corrosion resistance. The minimum yield strength reduces as thickness increases.
S355J2W Plates for Exposed Structural Steelwork
Applications include building steelwork, bridge-related fabrication and other engineered components where atmospheric-corrosion resistance is part of the material selection. The plates and sheets serve fabricators working to a specified EN weathering-steel grade rather than appearance alone.
Suitable exposure can allow the steel to develop a protective patina. Surfaces should be detailed to drain and dry, with run-off directed away from finishes vulnerable to staining. Persistent dampness and chloride-rich environments need particular assessment.
S355J2W Plate and Sheet Sizes
EN 10025-5:2019 includes S355J2W flat products up to 150 mm nominal thickness. ASC quotes thickness, width and length combinations for the project; the standard’s scope does not define current stock availability.
The tensile-property reference below covers 3–40 mm nominal thickness. Thin sheet below this range and thicker plate require their applicable material requirements, rather than extending one strength value across every size.
S355J2W Delivery Conditions: +AR and +N
The +AR suffix means as rolled. The +N suffix means normalized or normalizing rolled. These describe the delivery condition of the steel and are separate from the S355J2W grade name.
The required condition matters to fabrication and subsequent heat treatment. ASC handles enquiries with the delivery condition specified by the project, with the offered condition confirmed in the quotation.
S355J2W Plate and Sheet Supplier, Exporter and Stockist
ASC welcomes S355J2W export enquiries from fabricators and distributors in the UK and Europe, as well as USA buyers working to an EN material specification. We supply project and distribution requirements in plate and sheet form.
We specialize in fast delivery and prioritize urgent requirements. Dimensions, quantity, availability and destination determine the delivery schedule. Bundles or wooden boxes are packing options, selected to suit the material and order.
Mill test certificates and additional inspection can be requested. The documentation and inspection scope are agreed for the order.
Request an S355J2W Export QuoteS355J2W Chemical Composition
The selected ladle-analysis limits show the grade’s controlled carbon, manganese, silicon and weathering-alloy content. Values are mass percentages.
| Element | Limit |
|---|---|
| Carbon, C | ≤ 0.16 |
| Silicon, Si | ≤ 0.50 |
| Manganese, Mn | 0.50–1.50 |
| Phosphorus, P | ≤ 0.030 |
| Sulfur, S | ≤ 0.030 |
| Chromium, Cr | 0.40–0.80 |
| Copper, Cu | 0.25–0.55 |
Selected elements only. The complete grade requirements, including deoxidation and any other applicable composition provisions, remain part of the specified standard. Actual heat results are recorded in the material documentation.
S355J2W grade requirements, 2025 reference
S355J2W Mechanical Properties by Thickness
The minimum yield strength is thickness-dependent. In the selected reference, it is 355 MPa through 16 mm and 345 MPa above 16 mm through 40 mm. The tensile and elongation requirements are shown for the same bands.
| Nominal thickness, mm | Yield strength, minimum MPa | Tensile strength, MPa | Transverse elongation, minimum % |
|---|---|---|---|
| 3–16 inclusive | 355 | 470–630 | 20 |
| > 16–40 inclusive | 345 | 470–630 | 20 |
Elongation uses a proportional specimen with L₀ = 5.65√S₀, where S₀ is the original cross-sectional area. The transverse values are shown; longitudinal values differ. This is a selected thickness reference, not a stock range or the full standard schedule.
S355J2W tensile reference, page 2
J2 Impact Quality and Fabrication
J2 identifies a −20°C impact-test quality, with a 27 J longitudinal Charpy-V reference requirement. Specimen-size and acceptance rules apply. This is distinct from the ambient-temperature tensile properties.
An impact-test temperature is not an unconditional minimum operating temperature for a completed structure. Welding procedures, plate thickness, delivery condition, loading and the applicable design rules all contribute to material selection and fabrication.
S355J2W Plate and Sheet FAQs
What does S355J2W mean?
It identifies a structural weathering-steel grade. The 355 strength level applies to the relevant lower thickness range, J2 identifies the impact quality, and W indicates improved atmospheric-corrosion resistance. Its material number is 1.8965.
Is S355J2W the same as S355J2?
No. S355J2W is a weathering-steel grade under EN 10025-5. A plain S355J2 designation does not establish the same atmospheric-corrosion-resistance requirements.
Does the J2 designation guarantee use at −20°C?
J2 refers to the impact-test quality, not a blanket minimum service temperature. Suitability for a structure depends on its design rules, loading, thickness, fabrication and specified testing.
Does every S355J2W plate have a 355 MPa minimum yield strength?
No. The selected 3–16 mm band has a 355 MPa minimum; above 16 mm through 40 mm the reference minimum is 345 MPa. Other thickness bands have their own requirements.
What is the difference between S355J2W+AR and S355J2W+N?
+AR means as rolled; +N means normalized or normalizing rolled. The required delivery condition is part of the material requirement and is confirmed for the offered plate or sheet.
Can S355J2WP replace S355J2W?
They are different grades. S355J2WP is phosphorus-alloyed and has its own composition and product scope. Substitution requires assessment against the complete project specification.
Can S355J2W plates be used without paint?
Some applications can use them unpainted when exposure and detailing support protective weathering. Drainage, drying, chloride exposure and run-off should be assessed rather than assuming every outdoor installation is suitable.
What information affects an S355J2W export quotation?
Plate or sheet dimensions, quantity, required delivery condition, inspection requirements and destination affect the quotation. ASC can discuss test documentation, packing and urgent delivery requirements for the order.