S355J2WP Weathering Steel to EN 10025-5
The WP designation identifies the phosphorus-alloyed S355 weathering-steel family. J2 distinguishes the impact quality from J0, making S355J2WP a different material requirement from S355J0WP.
The product is hot-rolled flat steel used as the starting material for specified fabrication. Finished-component performance also depends on the section design, joining method and service conditions.
J2 Impact Quality: What the Specification Means
The J2 reference is 27 J longitudinal Charpy-V impact energy at −20°C. For S355 WP grades, verification of impact properties is specified with the order; it should be included when the project requires reported impact results.
The standard does not require impact testing below 6 mm nominal thickness. Reduced-size specimens and acceptance provisions apply, and −20°C is a test temperature rather than a blanket operating-temperature guarantee.
S355J2WP Plate and Sheet Sizes
The EN 10025-5:2019 flat-product scope for S355J2WP extends to 12 mm nominal thickness. ASC quotes thickness, width and length combinations for the required fabrication or distributor order.
The selected strength reference covers 3–12 mm material. Thinner sheet requires its applicable tensile provisions; heavier W-grade plate belongs to a different material scope.
S355J2WP Plate and Sheet Supplier, Exporter and Stockist
ASC exports internationally and welcomes S355J2WP enquiries from fabricators and distributors in the UK and Europe, as well as USA buyers working to EN specifications. Plate and sheet requirements are quoted to the requested dimensions and delivery condition.
We specialize in fast delivery and prioritize urgent requirements. The schedule depends on dimensions, quantity, availability and destination. Bundles or wooden boxes can be selected to suit the flat products and order.
Request an S355J2WP Export QuoteS355J2WP Chemical Composition
S355J2WP has a specified phosphorus range and a lower sulfur maximum than S355J0WP. The selected heat-analysis values below describe the grade, not an individual heat’s test results.
| Element | Limit |
|---|---|
| Carbon, C | ≤ 0.12 |
| Silicon, Si | ≤ 0.75 |
| Manganese, Mn | ≤ 1.00 |
| Phosphorus, P | 0.06–0.15 |
| Sulfur, S | ≤ 0.030 |
| Chromium, Cr | 0.30–1.25 |
| Copper, Cu | 0.25–0.55 |
| Nickel, Ni | ≤ 0.65 |
Selected elements only; the full composition and deoxidation provisions remain part of the specified standard. Heat-analysis limits differ from product-analysis tolerances.
2019 grade-composition reference, catalogue page 49
S355J2WP Mechanical Properties
The following strength requirements apply to the stated hot-rolled flat-product reference. Yield and tensile values should be considered together with the required impact quality, delivery condition and fabrication method.
| Nominal thickness, mm | Yield strength, minimum MPa | Tensile strength, MPa |
|---|---|---|
| 3–12 inclusive | 355 | 470–630 |
Reference for hot-rolled sheet/strip at least 600 mm wide, with transverse tensile testing. Values apply only to the stated thickness bands and are not actual heat-test results.
2019 grade-strength reference, catalogue page 49 · Test-direction and product-form reference
S355J2WP Plates for Exposed Fabricated Assemblies
Fabricators may specify S355J2WP for designed plate or sheet components where atmospheric-corrosion resistance and J2 material quality are part of the requirement. Architectural assemblies and exposed structural details need suitable drainage as well as the required mechanical performance.
For welded fabrications, the grade, joint thickness and service determine the welding procedure and consumables. A raw-material specification does not by itself qualify the completed weld or assembly.
Delivery Condition and Forming
+AR, +N and +M describe as-rolled, normalized or normalizing-rolled, and thermomechanically rolled delivery conditions. ASC handles the condition required by the project, confirmed in the material offer.
Forming and later heat treatment should suit that condition. Cold forming can reduce ductility, and heat treatment can change material properties; fabrication requirements are therefore considered alongside the steel grade.
Weathering Performance in Service
A protective patina develops where exposure allows wetting followed by drying. Water traps and persistent moisture can undermine that behaviour, while chloride-rich environments require particular assessment.
The weathered surface changes in colour and texture over time. Drainage should keep run-off away from concrete, paving and adjacent finishes that could stain.
Material Test Documents and Inspection
Mill test certificates and additional inspection can be requested for S355J2WP orders. The agreed documents identify the supplied grade and condition, with impact verification and other project-specific testing included where required.
S355J2WP Plate and Sheet FAQs
What is S355J2WP used for?
It is a weathering-steel flat-product grade for specified fabricated components requiring the WP composition and J2 impact quality. The component design and exposure determine its suitability.
Is S355J2WP the same as S355J2W?
No. S355J2WP is phosphorus-alloyed and has a 12 mm flat-product scope under EN 10025-5:2019. S355J2W has a different composition and broader flat-product thickness scope.
What does J2 mean for S355J2WP?
It identifies the −20°C impact quality, with a 27 J longitudinal Charpy-V reference. WP impact verification is specified with the order, and specimen-size and acceptance rules apply.
Does the −20°C test reference guarantee service at −20°C?
No. Material test temperature is one part of the engineering assessment. Thickness, loading, fabrication, testing and applicable design rules determine suitability for the finished component.
Can S355J2WP plate be supplied above 12 mm?
The EN 10025-5:2019 scope for this WP grade is limited to 12 mm nominal thickness. A requirement above that limit needs an appropriate material specification rather than extending the WP designation.
What is the difference between +N and +AR material?
+N is normalized or normalizing rolled; +AR is as rolled. These delivery conditions are separate from the grade and matter to planned forming or subsequent heat treatment.
Can S355J2WP be supplied with impact-test results?
Impact verification and supporting documentation can be requested as part of the order. Testing is subject to the applicable thickness, specimen and standard requirements.
How are S355J2WP export orders packed and scheduled?
Bundles or wooden boxes can be selected to suit the dimensions and quantity. ASC specializes in fast delivery, with the schedule determined by material availability, inspection scope and destination.