EN10025-5 S355J2WP Weather Resistant Steel Coil
EN10025-5 S355J2WP Weather Resistant Steel Coil - Properties, Equivalents & Applications
Detailed data sheet for EN10025-5 S355J2WP weather resistant structural steel coil, including chemical composition, mechanical and physical properties, international equivalents, and application guidelines.
Welding, bolting, cold forming, hot forming, cutting, machining
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EN10025-5 S355J2WP Weather Resistant Steel Coil Introduction
S355J2WP is a structural steel grade with improved atmospheric corrosion resistance, designated according to European standard EN 10025-5. This grade is often referred to as a weather resistant steel, similar to the well-known 'Corten' group. It achieves its corrosion resistance through the formation of a dense, adherent passive rust layer under alternating wet and dry cycles, which markedly slows down further corrosion.
- Minimum yield strength of 355 MPa for thicknesses ≤ 16 mm
- Enhanced resistance to atmospheric corrosion due to alloying elements (Cu, Cr, Ni, P)
- J2 quality: guaranteed impact energy of at least 27 J at -20°C
- Available in the form of hot-rolled coils, plates and strips
- Widely used for outdoor structures without protective paint, reducing maintenance costs
EN10025-5 S355J2WP Weather Resistant Steel Coil Chemical Composition
Ladle analysis according to EN 10025-5:2004. Values are maximum unless a range is indicated. The alloying concept relies on phosphorus, chromium, copper, and optionally nickel to provide the self-protecting oxide layer.
| Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.12 | Based on ladle analysis |
| Silicon (Si) | ≤ 0.75 | |
| Manganese (Mn) | ≤ 1.00 | |
| Phosphorus (P) | 0.06 – 0.15 | Higher than usual steels to enhance corrosion resistance |
| Sulfur (S) | ≤ 0.035 | |
| Chromium (Cr) | 0.30 – 1.25 | |
| Copper (Cu) | 0.25 – 0.55 | |
| Nickel (Ni) | ≤ 0.65 | |
| Molybdenum (Mo) | ≤ 0.30 | Optional, may be present as residual |
| Nitrogen (N) | ≤ 0.012 | If sufficient Al or other nitrogen binders are present, no limit applies |
| Aluminium (Al) | ≥ 0.020 total | Al content for nitrogen fixation |
| Vanadium (V) | ≤ 0.15 | Optional, if added |
| Titanium (Ti) | ≤ 0.05 | Optional, if added |
| Niobium (Nb) | ≤ 0.06 | Optional, if added |
| Iron (Fe) | Balance | Remainder |
EN10025-5 S355J2WP Weather Resistant Steel Coil Thermal and Electrical Physical Properties
Physical properties at room temperature for low-alloy weather resistant steel. These values are indicative and may vary slightly with exact composition and processing.
| Property | Standard Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | kg/dm³ | Typical for low-alloy steels; temperature 20°C |
| Elastic modulus (E) | 210 | GPa | At ambient temperature; may decrease with temperature |
| Shear modulus (G) | 81 | GPa | Calculated from E and Poisson's ratio |
| Poisson's ratio (ν) | 0.30 | - | Typical for steel |
| Thermal expansion coefficient (α) | 11.5 – 12.5 × 10⁻⁶ | K⁻¹ | Mean value between 20°C and 100°C; varies slightly with alloying |
| Thermal conductivity (λ) | 32 – 38 | W/(m·K) | At 20°C; lower than plain carbon steel due to alloying elements |
| Specific heat capacity (cp) | ~460 | J/(kg·K) | At 20°C; typical value |
| Electrical resistivity (ρe) | 0.25 – 0.30 | µΩ·m | At 20°C; typical for weathering steel |
EN10025-5 S355J2WP Weather Resistant Steel Coil Mechanical Properties
Mechanical properties at ambient temperature for flat products (coil, plate) in as-rolled or normalized condition. Values are minimum unless specified. The J2 suffix indicates Charpy-V impact test at -20°C.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | ≤ 16 mm: ≥ 355 | MPa | Longitudinal; thickness ≤ 16 mm |
| Yield strength (ReH) | 16 – 40 mm: ≥ 345 | MPa | Longitudinal; thickness 16 < t ≤ 40 mm |
| Yield strength (ReH) | 40 – 63 mm: ≥ 335 | MPa | Longitudinal; thickness 40 < t ≤ 63 mm |
| Yield strength (ReH) | 63 – 80 mm: ≥ 325 | MPa | Longitudinal; thickness 63 < t ≤ 80 mm |
| Yield strength (ReH) | 80 – 100 mm: ≥ 315 | MPa | Longitudinal; thickness 80 < t ≤ 100 mm |
| Tensile strength (Rm) | 470 – 630 | MPa | Longitudinal; thickness ≤ 100 mm |
| Elongation (A) | ≤ 16 mm: ≥ 22 | % | Longitudinal; gauge length Lo = 5.65√So |
| Elongation (A) | 16 – 40 mm: ≥ 22 | % | Longitudinal |
| Elongation (A) | 40 – 63 mm: ≥ 21 | % | Longitudinal |
| Elongation (A) | 63 – 80 mm: ≥ 20 | % | Longitudinal |
| Elongation (A) | 80 – 100 mm: ≥ 20 | % | Longitudinal |
| Impact energy (KV2) | ≥ 27 | J | Longitudinal; -20°C; min. average of 3 tests; single value ≥ 70% of average |
| Bend test | No cracks | - | Mandrel diameter depends on thickness; no cracking up to 360° for transverse specimens |
EN10025-5 S355J2WP Weather Resistant Steel Coil Exactly Matching Material Standards and Substitutable Grades
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| Europe | EN 10025-5 | S355J2WP | Original designation; available as +AR, +N |
| UK (BS) | BS EN 10025-5 | S355J2WP | Adopted European standard |
| France (NF) | NF EN 10025-5 | S355J2WP | Identical to EN |
| Germany (DIN) | DIN EN 10025-5 | S355J2WP | Formerly known as WTSt 37-3, but now EN is used |
| Italy (UNI) | UNI EN 10025-5 | S355J2WP | Identical to EN |
| Spain (UNE) | UNE EN 10025-5 | S355J2WP | Identical to EN |
| Sweden | SS-EN 10025-5 | S355J2WP | SS-EN adoption |
| European structural steel | EN 10025-5:2019 | S355J2WP | Latest revision; no changes for this grade |
EN10025-5 S355J2WP Weather Resistant Steel Coil Application Introduction
S355J2WP is engineered for uncoated outdoor applications where the natural patina offers aesthetic appeal and low maintenance. Its improved atmospheric corrosion resistance makes it suitable for structures exposed to rural, urban, and moderate industrial atmospheres. Welding is possible with appropriate consumables; preheating may be required for thicker sections. Cold forming is good for thicknesses up to 12 mm. The material is often used without paint, but compatible coating systems exist if required.
Product Applications: Structural beams and columns, Outdoor sculptures and facades, Shipping containers and dry bulk hoppers, Pedestrian bridges and footbridges, Noise reduction barriers, Ventilation ducts and chimney shells, Garden and street furniture
Processed into products: Bridge main girders and cross-beams, Facade panels and cladding, Truck frames and container corner fittings, Railway wagon side walls, Chimney shells and flue linings, Pole structures and masts, Architectural fins and louvers
Application industries: Bridge construction, Architecture and building envelopes, Railway rolling stock and freight containers, Highway equipment (sign gantries, noise barriers), Industrial chimneys, ducts and silos, Electrical transmission towers, Shipbuilding (limited to non-marine weathering applications), Artistic and landscape structures
EN10025-5 S355J2WP Weather Resistant Steel Coil Similar/Comparable Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A588 / A588M | Grade A | Similar weather resistance; minimum yield 345 MPa (50 ksi). Phosphorus content lower; Cr, Cu, Ni ranges differ slightly. Not identical to S355J2WP but often used interchangeably for construction. |
| USA | ASTM A588 / A588M | Grade B | Alternative to Grade A; higher Manganese. Similar strength and corrosion resistance. |
| USA | ASTM A242 / A242M | Type 1 | Former 'Corten A' class; higher P content. Minimum yield ~345 MPa. Corrosion resistance similar; less common today. |
| Japan | JIS G 3125 | SPA-H | High phosphorus weathering steel for hot-rolled sheet; typical yield 355 MPa or higher. Chemical composition differs (P 0.07-0.15). Not a direct equivalent but similar application. |
| Japan | JIS G 3114 | SMA570P | Higher strength weather resistant steel with P, Cr, Cu. Yield 570 MPa; not a 355 MPa grade but used when weight reduction is needed. |
| China | GB/T 4171 | Q355GNH | Chinese weathering steel with improved atmospheric corrosion resistance; yield 355 MPa. P content lower than S355J2WP, may need protective coating in severe environments. |
| International (ISO) | ISO 4952 | Fe510D1K1 | ISO equivalent for weather resistant steel; yield 355 MPa, impact at -20°C. Composition may differ in residual elements. |
Notes:
Welding: Use matching or slightly overmatching filler metals (e.g., ER80S-W or E81T1-W). For thickness > 30 mm, a low hydrogen process and controlled preheat/interpass temperature are recommended. Corrosion: The protective patina develops only when the surface experiences alternating wet/dry cycles; continuously immersed conditions should be avoided. Paintability: If painted, the surface must be prepared to ensure adhesion; unpainted use is the primary benefit. Availability: Usually supplied in thicknesses from 1.5 mm up to 100 mm as coil, cut lengths, or plate. For thicknesses above 100 mm, consult the manufacturer.
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