S355J2WP Weathering Material for Tubular Components
S355J2WP is material number 1.8946 under EN 10025-5:2019. Its WP classification describes a phosphorus-alloyed weathering material, while J2 identifies the −20°C material impact quality.
S355J2WP is used in fabricated tube assemblies specified with the WP composition and J2 quality. Its chemistry differs from S355J2W, while its impact quality differs from S355J0WP, even where the visible forms and intended weathering finish are similar.
Specified Frames and Engineered Metalwork
Project applications can include exposed tubular supports, fabricated frames and engineered architectural metalwork. For these assemblies, material identity and connection performance matter alongside the appearance of the finished steel.
Where a component is replaced or incorporated into existing steelwork, its material requirement should remain aligned with the approved design. A higher or similar nominal strength in another grade does not by itself address the composition, toughness and fabrication requirements.
S355J2WP Pipes and Tubes Exporter
ASC handles S355J2WP requirements for individual projects and steel distribution. We welcome international enquiries, including from the USA, UK and Europe, with quotations covering the required tube dimensions, quantities and delivery destination.
Our service specializes in fast delivery and prioritizes urgent orders. The agreed product, inspection scope and destination determine the schedule. Bundles or wooden boxes can be used for export packing according to tube dimensions and handling needs.
Mill test certificates and additional inspection can be requested for the supply.
Get an S355J2WP Export QuoteS355J2WP Parent-Steel Chemical Composition
The WP composition contains a defined phosphorus range alongside its controlled carbon and alloying content. S355J2WP also has a different sulfur limit from S355J0WP, so sharing the WP suffix does not make the two chemical specifications identical.
These are parent-material heat-analysis references. The actual material heat and any weld-metal analysis are identified through the relevant supply and fabrication records.
| 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 |
These selected limits describe the parent steel, not a completed-tube or weld-metal analysis. Full composition and deoxidation provisions apply; heat-analysis limits are separate from product-analysis tolerances.
2019 parent-material composition reference, catalogue page 49
J2 Quality and Specified Impact Verification
J2 denotes the −20°C impact quality of the parent material. For S355 class WP, EN 10025-5:2019 requires verification of impact properties only when that option is specified with the order. A J2WP designation therefore does not, on its own, show that reported impact results accompany the material.
The specimen, product thickness and acceptance rules remain part of the applicable test basis. Test temperature is not a universal service-temperature rating, and a parent-material result does not automatically qualify a tube weld or a completed assembly.
S355J2WP Pipe Specifications and Finished-Product Tests
EN 10025-5 defines the hot-rolled parent-material grade. The finished tube requires its own construction, dimensional and testing provisions. Those provisions establish the product to be supplied, including any tensile, weld or impact checks required for acceptance.
EN 10219-3 is a separate standard for cold-formed welded structural hollow sections in high-strength and weather-resistant steels. Its use needs an expressly agreed compliant product; it is not conferred by the S355J2WP material name. No pressure rating follows from the grade designation.
Round Tube Dimensions and Delivery Condition
Outside diameter, wall thickness and length describe the round tube. Straightness, wall tolerance and end condition affect the fit of the component in a fabricated assembly. ASC quotes these features to the required schedule, in metric or inch dimensions.
The manufacturing route and final delivery condition are identified for the offered product. A parent-steel plate or strip thickness band is not a finished-tube wall range, and material delivery suffixes should be read in the context of the record to which they apply.
Fabrication and Mechanical Performance
The finished condition matters to the performance of a formed or welded tube. A suitable welding procedure and consumables account for the material, dimensions and intended service; any required weld or heat-affected-zone tests form part of the agreed fabrication and inspection requirements.
Yield strength, tensile strength and elongation are read against the applicable tube test basis. The agreed test programme covers the required finished condition and any subsequent processing.
S355J2WP Compared with Related Weathering Materials
S355J2WP combines WP chemistry with J2 impact quality. S355J0WP has a different impact quality, while S355J2W belongs to the W material class.
| Designation | Distinction |
|---|---|
| S355J2WP / 1.8946 | Higher-phosphorus WP material with J2 quality; impact verification is order-specified under the material standard. |
| S355J0WP / 1.8945 | A different impact quality within the WP class; grade-specific chemical limits also apply. |
| S355J2W / 1.8965 | J2 weathering material in the W class, with different carbon and phosphorus provisions. |
| ASTM A847 | A separate structural weathering-tube specification, not an automatic ASTM equivalent of S355J2WP. |
A proposed substitute or dual-compliance claim must satisfy the actual material and finished-product requirements.
EN material classification and WP verificationASTM structural-tube scope
Weathering Exposure and Assembly Details
The exterior weathering layer develops best where surfaces can dry between wet periods. Persistent moisture, deposits and high chloride exposure can change the corrosion behaviour, including at joints and around tube ends.
The design should address internal moisture as well as the visible face of a hollow component. Drainage and the management of run-off help protect adjacent finishes and support the intended unpainted appearance where that finish is suitable.
S355J2WP Pipe and Tube FAQs
How does S355J2WP differ from S355J2W?
Both names include J2 impact quality, but WP is the higher-phosphorus material class. The carbon and phosphorus provisions differ, so matching the J2 suffix alone does not establish material equivalence.
Are S355J2WP impact properties always verified by test?
Not automatically under the parent-material standard. EN 10025-5:2019 makes impact verification for S355 class WP an order-specified option. If reported impact results are required, the test scope must be included for the relevant material or finished product.
Does J2WP guarantee operation at −20°C?
No. −20°C identifies the material impact-test quality, not a blanket operating limit. Component thickness, loading, fabrication and the finished assembly’s design requirements govern service suitability.
How does S355J2WP differ from S355J0WP?
Both belong to the higher-phosphorus WP class. S355J2WP has J2 rather than J0 impact quality and a lower sulfur maximum in its parent-material specification. Impact verification for either WP grade is included when specified with the order.
Which S355J2WP tube dimensions can ASC quote?
ASC quotes round tubes by outside diameter, wall thickness and length, with the required end condition and dimensional tolerances. Available combinations depend on the specified construction and finished-product requirements.
Is there a direct ASTM or ASME equivalent?
The S355J2WP name does not identify an ASTM or ASME tube specification. ASTM A847 is a separate structural-tube specification, while S355J2WP is an EN material grade. Any substitution or dual-compliance claim needs the appropriate product requirements and supporting records.
Which inspection documents can accompany an order?
Mill test certificates and additional inspection can be requested. The agreed documentation should identify the material heat, supplied product and any required finished-tube or weld tests, rather than relying on a grade name alone.
How does ASC quote S355J2WP pipe export orders?
The quotation reflects dimensions, quantity, construction requirements, inspection, packing and destination. ASC prioritizes urgent requirements and can arrange bundles or wooden boxes to suit the order.