EN 10025-5 S355J2W Weather Resistant Steel Plate
EN 10025-5 S355J2W Weather Resistant Steel Plate: Composition, Properties & Equivalents
Comprehensive datasheet of EN 10025-5 S355J2W weather resistant steel plate covering chemical composition, mechanical properties, thermal and electrical properties, international equivalents, and application guidance.
Thermomechanical rolling (+M) or normalized rolling (+N); suitable for welding (all conventional methods), bending, machining, and bolting.
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EN 10025-5 S355J2W Weather Resistant Steel Plate Introduction
EN 10025-5 S355J2W is a thermomechanically rolled weldable fine grain structural steel with improved atmospheric corrosion resistance (weathering steel). It is designed for use in welded, bolted or riveted structures in outdoor exposure, where enhanced durability against corrosion is required. The proprietary alloying elements (primarily Cr, Cu, Ni) form a protective patina that inhibits further corrosion, often eliminating the need for painting. The 'J2' suffix indicates guaranteed longitudinal impact energy of minimum 27 J at -20°C. S355J2W offers a minimum yield strength of 355 MPa for thicknesses up to 16 mm and is widely used in bridges, building facades, containers, and structural frameworks.
EN 10025-5 S355J2W Weather Resistant Steel Plate Chemical Composition according to EN 10025-5
The chemical composition is based on cast analysis. The table lists the permissible ranges for major alloying elements that provide enhanced atmospheric corrosion resistance. Other elements are controlled as residual impurities. Note: To achieve the equivalent corrosion resistance index, the alloy content must satisfy the formula given in the standard (typically related to Cr, Cu, P, Ni).
| Element | Value (%) | Remarks |
|---|---|---|
| C | ≤ 0.19 | Maximum |
| Si | ≤ 0.55 | Maximum |
| Mn | 0.45 – 1.60 | Range |
| P | ≤ 0.040 | Maximum |
| S | ≤ 0.035 | Maximum |
| N | ≤ 0.012 | Maximum |
| Cr | 0.40 – 0.80 | Weathering element |
| Ni | ≤ 0.65 | Maximum, contributes to toughness |
| Cu | 0.25 – 0.55 | Weathering element |
| Al | ≥ 0.020 | Minimum for fine grain practice |
EN 10025-5 S355J2W Weather Resistant Steel Plate Thermal and Electrical Physical Properties
Physical properties are nominal for general steel and slightly influenced by the exact chemical composition. These values are suitable for engineering calculations for S355J2W as a low-alloy structural steel. Thermal expansion coefficient is an average value over the stated temperature range.
| Property | Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Modulus of elasticity (E) | 210 | GPa | 20 °C |
| Shear modulus (G) | 81 | GPa | 20 °C (calculated) |
| Poisson's ratio (ν) | 0.3 | - | 20 °C |
| Thermal expansion coefficient (α) | 12.0 × 10⁻⁶ | K⁻¹ | 20 °C – 100 °C |
| Thermal conductivity (λ) | 45 | W/(m·K) | 20 °C |
| Specific heat capacity (cp) | 460 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρₑ) | 0.25 × 10⁻⁶ | Ω·m | 20 °C |
EN 10025-5 S355J2W Weather Resistant Steel Plate Mechanical Properties
Values are valid for products supplied in the +M (thermomechanically rolled) or +N (normalized rolled) condition as specified in EN 10025-5. The yield strength and tensile strength vary depending on product thickness. Impact properties refer to longitudinal V-notch Charpy energy for grade J2 (27 J at -20°C).
| Property | Value | Unit | Test Condition / Thickness Range |
|---|---|---|---|
| Yield strength (ReH) | ≥ 355 | MPa | Nominal thickness ≤ 16 mm |
| Yield strength (ReH) | ≥ 345 | MPa | 16 mm < thickness ≤ 40 mm |
| Yield strength (ReH) | ≥ 335 | MPa | 40 mm < thickness ≤ 63 mm |
| Yield strength (ReH) | ≥ 325 | MPa | 63 mm < thickness ≤ 80 mm |
| Tensile strength (Rm) | 470 – 630 | MPa | thickness ≤ 100 mm |
| Elongation (A) | ≥ 22 | % | Longitudinal, thickness ≤ 40 mm, gauge L0 = 5.65√S0 |
| Elongation (A) | ≥ 21 | % | Longitudinal, 40 mm < thickness ≤ 63 mm |
| Impact energy (KV, longitudinal) | ≥ 27 | J | At -20 °C (grade J2) |
| Bend test (mandrel diameter) | 1t | - | thickness ≤ 16 mm, 180° bend |
| Bend test (mandrel diameter) | 1.5t | - | 16 mm < thickness ≤ 40 mm |
| Bend test (mandrel diameter) | 2t | - | 40 mm < thickness ≤ 63 mm |
EN 10025-5 S355J2W Weather Resistant Steel Plate Full Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5:2004 | S355J2W +M/+N | Direct standard |
| International | ISO 4952:2013 | S355J2W | Equivalent in chemical and mechanical properties |
| Finland | SFS-EN 10025-5 | S355J2W | Identical adoption |
| Germany | DIN EN 10025-5 | S355J2W | Identical adoption |
| China | GB/T 4171:2008 | Q355NHD (similar to J2W) | Comparable, check impact temperature |
EN 10025-5 S355J2W Weather Resistant Steel Plate Application Introduction
S355J2W is ideal for steel structures exposed to atmospheric conditions where reduced maintenance and long service life are required. It can be used in unpainted condition if the environmental conditions allow formation of a stable patina. Suitable for all conventional fabrication processes including welding (with matching weathering filler metals), cold forming, and machining.
Product Applications: Bridges and overpasses, Building frames and cladding, Storage tanks (exterior surfaces), Transmission towers, Railway carriages and wagons, Container boxes and ships
Processed into products: Welded main girders and cross beams, Flanges and web plates in plate girders, Corner profiles and stiffeners, Architectural perforated screens, Rolled sections for structural columns, Bent plates for curved facades, Bolted connection plates and brackets
Application industries: Bridge construction, Building and civil engineering, Railway rolling stock, Container manufacturing, Industrial equipment and chimneys, Architectural facades and sculptures
EN 10025-5 S355J2W Weather Resistant Steel Plate Similar or Comparable Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5 | S355J0W | Same strength, impact at 0 °C instead of -20 °C |
| Europe | EN 10025-5 | S355K2W | Higher toughness at -20 °C (40 J min), otherwise similar |
| Europe | EN 10025-5 | S355J2WP | Contains higher P for enhanced corrosion resistance; slightly lower impact requirements |
| USA | ASTM A588/A588M | Grade A / Grade B | Similar weathering steel, strength 345 MPa (50 ksi) for t≤100 mm |
| Japan | JIS G 3125:2015 | SPA-H | High weather resistance, typical yield ≥355 MPa; not identical in alloy design |
| China | GB/T 4171 | Q355NHE | Equivalent to S355J2W in strength and impact temperature (-20 °C) |
Notes:
For welding, use electrodes matching the weather resistance (e.g., AWS E7018-W or equivalent). Preheating may be required for thick sections. The stable protective patina develops after several wet-dry cycles; in highly aggressive environments (marine splash, heavy industrial pollution), periodic inspection is recommended. Products can be delivered with inspection certificates according to EN 10204 3.1 or 3.2.
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