EN 10155 S355J2G2W Weathering Steel Coil
EN 10155 S355J2G2W Weathering Steel Coil Datasheet & Equivalent Grades
Detailed material data for S355J2G2W weathering steel coil according to EN 10155-1993, including chemical composition, mechanical properties, thermal/electrical properties, international equivalents, and application guidelines.
Hot rolling, normalizing, thermomechanical rolling, welding, laser cutting, plasma cutting, shearing, bending, profiling
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EN 10155 S355J2G2W Weathering Steel Coil Introduction
S355J2G2W is a structural weathering steel grade defined in the withdrawn European standard EN 10155:1993 (now superseded by EN 10025-5). It is a low-alloy, weldable fine-grain steel with improved atmospheric corrosion resistance due to the addition of alloying elements such as copper, chromium, and nickel. When exposed to the weather, it develops a protective patina that drastically reduces the corrosion rate compared to ordinary carbon steel. The designation indicates: S = structural steel, 355 = minimum yield strength of 355 MPa (for thicknesses ≤16 mm), J2 = minimum impact energy of 27 J at -20 °C, G2 = fully killed fine-grain steel, and W = weather-resistant. The material is typically supplied in the normalized or thermomechanically rolled condition and is widely used in uncoated atmospheric conditions such as bridge structures, building façades, and shipping containers.
EN 10155 S355J2G2W Weathering Steel Coil Chemical Composition
The chemical composition of S355J2G2W conforming to EN 10155:1993 (Table 4, option 2 for weathering steel). The values are based on ladle analysis. The fine-grain practice ensures sufficient aluminium content (or other grain-refining elements) to meet the J2 impact requirement. Limits are maxima unless a range is given.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| 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 | |
| Nickel (Ni) | ≤ 0.65 | |
| Copper (Cu) | 0.25 – 0.55 | |
| Aluminium (Al) (total) | ≥ 0.020 | Applicable when fine-grain practice is required |
| Nitrogen (N) | ≤ 0.009 | Al ≤0.015 if nitrogen-binding elements (V,Nb,Ti) are used |
| Vanadium (V) | ≤ 0.12 | Optional grain-refining addition |
| Niobium (Nb) | ≤ 0.06 | Optional grain-refining addition |
| Titanium (Ti) | ≤ 0.05 | Optional grain-refining addition |
EN 10155 S355J2G2W Weathering Steel Coil Thermal and Electrical Physical Properties
The physical properties listed below are typical for S355J2G2W weathering steel at room temperature and elevated temperatures. These data are based on standard structural steel values and are suitable for engineering calculations. The corrosion resistance improves with the development of the patina under wet/dry cycling conditions.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | 20 °C |
| Modulus of elasticity (E) | 210 | GPa | 20 °C |
| Shear modulus (G) | 81 | GPa | 20 °C |
| Poisson's ratio (ν) | 0.3 | – | 20 °C |
| Thermal expansion coefficient (α) | 11.1 | 10⁻⁶/K | 20 – 100 °C |
| Thermal expansion coefficient (α) | 12.2 | 10⁻⁶/K | 20 – 200 °C |
| Thermal expansion coefficient (α) | 12.8 | 10⁻⁶/K | 20 – 300 °C |
| Thermal expansion coefficient (α) | 13.5 | 10⁻⁶/K | 20 – 400 °C |
| Thermal expansion coefficient (α) | 13.9 | 10⁻⁶/K | 20 – 500 °C |
| Thermal conductivity (λ) | 51.9 | W/(m·K) | 20 °C |
| Thermal conductivity (λ) | 51.0 | W/(m·K) | 100 °C |
| Thermal conductivity (λ) | 49.8 | W/(m·K) | 200 °C |
| Thermal conductivity (λ) | 47.6 | W/(m·K) | 300 °C |
| Thermal conductivity (λ) | 44.6 | W/(m·K) | 400 °C |
| Thermal conductivity (λ) | 41.0 | W/(m·K) | 500 °C |
| Specific heat capacity (Cp) | 460 | J/(kg·K) | 20 °C |
| Electrical resistivity (ρe) | 0.13 | 10⁻⁶ Ω·m | 20 °C |
EN 10155 S355J2G2W Weathering Steel Coil Mechanical Properties
Minimum mechanical properties for S355J2G2W according to EN 10155:1993. Values depend on the product thickness (t) in millimetres. The longitudinal (L) impact energy is the most common requirement; transverse (T) values may be agreed at the time of enquiry and order.
| Property | Requirement Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) - upper | ≥ 355 | MPa | t ≤ 16 mm |
| Yield strength (ReH) | ≥ 345 | MPa | 16 < t ≤ 40 mm |
| Yield strength (ReH) | ≥ 335 | MPa | 40 < t ≤ 63 mm |
| Yield strength (ReH) | ≥ 325 | MPa | 63 < t ≤ 80 mm |
| Yield strength (ReH) | ≥ 315 | MPa | 80 < t ≤ 100 mm |
| Tensile strength (Rm) | 470 – 630 | MPa | t ≤ 100 mm |
| Tensile strength (Rm) | 450 – 600 | MPa | 100 < t ≤ 150 mm |
| Elongation (A) - longitudinal | ≥ 22 | % | t ≤ 40 mm (gauge length L0 = 5.65√So) |
| Elongation (A) | ≥ 21 | % | 40 < t ≤ 63 mm |
| Elongation (A) | ≥ 20 | % | 63 < t ≤ 100 mm |
| Elongation (A) | ≥ 19 | % | 100 < t ≤ 150 mm |
| Impact energy (KV2) - longitudinal | ≥ 27 | J | -20 °C (J2) |
| Bend test (mandrel diameter) | 3 a | Thickness t ≤ 16 mm (180° bend, a = thickness of test piece) | |
| Bend test (mandrel diameter) | 4 a | 16 < t ≤ 40 mm | |
| Bend test (mandrel diameter) | 5 a | 40 < t ≤ 63 mm | |
| Bend test (mandrel diameter) | 6 a | 63 < t ≤ 100 mm |
EN 10155 S355J2G2W Weathering Steel Coil Fully Equivalent Material Standards and Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5:2004 | S355J2W (1.8965) | Direct successor to S355J2G2W under the current harmonised European standard. |
| Europe | DIN EN 10025-5 | S355J2W+N / S355J2W+M | Formerly designated as 1.8965; identical chemical and mechanical requirements. |
| Finland | SFS-EN 10155 | S355J2G2W | Same grade under national adoption of EN 10155. |
| United Kingdom | BS EN 10155 | S355J2G2W | British Standard implementation of EN 10155 with no significant changes. |
EN 10155 S355J2G2W Weathering Steel Coil Application Introduction
S355J2G2W weathering steel is designed for welded, bolted or riveted structures where improved atmospheric corrosion resistance is required. The natural protective patina eliminates the need for painting in many environments, significantly reducing maintenance costs. However, the design must ensure proper wet/dry cycling to form a dense oxide layer. The steel can be processed by all common fabrication methods.
Product Applications: Steel bridge decks and girders, Uncoated building façades and cladding systems, Weathering steel sculptures and landscape elements, Railway passenger cars and freight wagons, Intermodal shipping containers (side panels, frames), Chimney stacks and flue liners, Highway guardrails and sign supports, Transmission line towers and poles
Processed into products: Welded H-beams and I-beams for building frames, Girder web and flange plates for composite bridges, Box girder stiffeners and diaphragms, Cold-formed profiles for cladding and roofing, Laser-cut architectural screens and louvers, Shipping container corrugated side panels and corner posts, Tubular poles for lighting and power transmission, Bent plates for elbows and transition pieces in stacks
Application industries: Civil engineering and infrastructure, Building and construction, Shipbuilding (non-marine hulls, e.g., container ships hatch covers), Railway and rolling stock manufacturing, Architectural and structural art, Energy and utilities (chimneys, silos, transmission towers)
EN 10155 S355J2G2W Weathering Steel Coil Similar / Substitutable Weathering Steel Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A588 / A588M | Grade B (K12040) | Chemical composition similar (Cu, Cr, Ni, V). Yield strength ≥345 MPa (≥50 mm), but weldable and meets atmospheric corrosion resistance. Commonly used for unpainted bridges. |
| USA | ASTM A242 / A242M | Type 1 (K11510) | Early weathering steel specification; minimum yield 345 MPa (≤19 mm), slightly lower strength but excellent corrosion resistance. |
| Japan | JIS G3125 | SPA-H (t≥6mm) | High strength atmospheric corrosion resisting rolled steel. Typical yield ≥355 MPa for thickness ≥6 mm, tensile 490–610 MPa. Close performance match. |
| Japan | JIS G3114 | SMA570W | 580 MPa class welding structural weather-resistant steel. Overmatched in strength; suitable for higher loads but requires revised design. |
| China | GB/T 4171 | Q355GNH | Typical Chinese weathering steel with yield ≥355 MPa and similar alloy concept (Cu, Cr, Ni). Equivalent performance in atmospheric exposure. |
Notes:
Important processing notes: When welding S355J2G2W, matching weathering consumables (e.g., electrodes or welding wires with Ni–Cu alloying) should be used to ensure the weld seam develops a similar patina. Preheating may be required depending on section thickness. For structures in highly aggressive environments (marine with high chloride or permanent wet zones) the patina may not form correctly, and additional corrosion protection (paint or metal spray) is recommended. The data provided are based on the now withdrawn EN 10155:1993 and typical engineering values; for current procurement, refer to EN 10025-5:2004 grade S355J2W.
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