EN 10155 S355K2G1W Weather Resistant Steel Plate
EN 10155 S355K2G1W Weather Resistant Steel Plate - Composition, Properties & Equivalents
Detailed data sheet for S355K2G1W weathering steel according to the withdrawn EN 10155 standard. Includes chemical composition, mechanical and physical properties, international equivalents, similar materials, and application guidelines for construction, bridges, and transport.
Hot rolling, normalizing, welding, bending, cold forming, cutting
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EN 10155 S355K2G1W Weather Resistant Steel Plate Introduction
S355K2G1W is a European structural weathering steel grade from the withdrawn standard EN 10155. It belongs to the class of low-alloy steels with improved atmospheric corrosion resistance. The alloying elements (Cu, Cr, Ni) promote the formation of a dense, self-healing oxide layer (patina) that significantly reduces corrosion rates in most atmospheric environments, often eliminating the need for protective coatings. The G1 designation indicates delivery in the normalized or normalized rolled condition. K2 guarantees a minimum impact energy of 40 J at -20°C. Typical applications include uncoated bridges, building envelopes, containers, and railway vehicles. The current replacement standard is EN 10025-5 S355K2W.
EN 10155 S355K2G1W Weather Resistant Steel Plate Chemical Composition
Chemical composition limits for S355K2G1W according to EN 10155. The steel is alloyed to enhance atmospheric corrosion resistance. Microalloying elements such as Nb, V, Ti, Al may be added at the manufacturer's discretion to achieve fine grain and mechanical properties; when added they shall be reported in the inspection document.
| Element | Content (%) | 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 |
EN 10155 S355K2G1W Weather Resistant Steel Plate Thermal and Electrical Physical Properties
Typical physical properties for structural weathering steel at room temperature (20°C). These values are not specified in EN 10155 but are characteristic of low‑alloy steels of this type. Properties may vary slightly with exact composition and processing.
| Property | Typical Value | Unit | Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Modulus of elasticity (E) | 210 | GPa | 20°C |
| Shear modulus (G) | 80 | GPa | 20°C |
| Poisson's ratio (ν) | 0.3 | – | 20°C |
| Thermal expansion coefficient (α) | 12.0 | 10⁻⁶/K | 20–100°C |
| Thermal conductivity (λ) | 43 | W/(m·K) | 20°C |
| Specific heat capacity (c) | 460 | J/(kg·K) | 20°C |
| Electrical resistivity (ρ_e) | 0.20 | μΩ·m | 20°C |
EN 10155 S355K2G1W Weather Resistant Steel Plate Mechanical Properties
Mechanical properties in normalized (+N) or normalized rolled (+NR) condition according to EN 10155. Values are valid for flat products and depend on the nominal thickness t. The impact test is performed on longitudinal Charpy‑V specimens at -20°C. Elongation is measured on a proportional gauge length Lo=5.65√So. Bend test mandrel diameter d depends on thickness.
| Property | Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) t≤16 mm | ≥355 | MPa | Transverse |
Yield strength (ReH) 16| ≥345 | MPa | Transverse | |
Yield strength (ReH) 40| ≥335 | MPa | Transverse | |
Yield strength (ReH) 63| ≥325 | MPa | Transverse | |
Yield strength (ReH) 80| ≥315 | MPa | Transverse | |
| Tensile strength (Rm) t≤100 mm | 470–630 | MPa | Transverse |
| Elongation (A) t≤16 mm | ≥22 | % | Lo=5.65√So |
Elongation (A) 16| ≥22 | % | Lo=5.65√So | |
Elongation (A) 40| ≥22 | % | Lo=5.65√So | |
Elongation (A) 63| ≥21 | % | Lo=5.65√So | |
Elongation (A) 80| ≥20 | % | Lo=5.65√So | |
| Impact energy (KV) -20°C | ≥40 | J | Longitudinal, Charpy‑V |
| Bend test (t≤16 mm) | d=2t (no cracks) | – | 180° bend |
| Bend test (t>16 mm) | d=3t (no cracks) | – | 180° bend |
EN 10155 S355K2G1W Weather Resistant Steel Plate Full Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5 | S355K2W | Direct successor of S355K2G1W; identical chemical and mechanical requirements, current active standard. |
EN 10155 S355K2G1W Weather Resistant Steel Plate Application Introduction
S355K2G1W weathering steel is intended for load‑bearing structures where enhanced atmospheric corrosion resistance is exploited. The stable patina that forms after alternating wet/dry cycles reduces maintenance and allows unpainted use in many outdoor environments. It is not recommended for
- permanently wet or submerged conditions,
- aggressive industrial atmospheres with high SO₂ concentration,
- marine splash zones without additional protection.
Proper detailing and drainage are required to avoid moisture traps. Welding consumables must match the strength and weathering characteristics of the base material.
Product Applications: Weathering steel bridges (composite and plate girder), Multi‑storey building frames and exposed architectural panels, ISO freight containers and swap bodies, High‑voltage transmission line towers, Outdoor sculptures and landscape elements
Processed into products: Bridge main girders, cross beams, stiffeners, Welded box sections and hollow profiles for columns, Container corner castings, side and roof panels, Tower legs, angle braces, and gusset plates, Cold‑formed purlins and cladding rails
Application industries: Bridge and highway construction, Building and civil engineering (facades, canopies), Railway rolling stock and freight container manufacturing, Energy sector (transmission towers, wind tower sections), Architecture and public art (weathering steel sculptures, cladding)
EN 10155 S355K2G1W Weather Resistant Steel Plate Similar / Alternative Materials with Proximate Properties
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A588/A588M | Grade B | Weathering steel with min. yield strength 345 MPa. Similar atmospheric corrosion resistance, but chemical composition differs; not a full equivalent. |
| Japan | JIS G3114 | SMA490CW | Weathering steel with min. yield strength 365 MPa. Similar application fields, but requires careful matching of composition and mechanical properties. |
| China | GB/T 4171 | Q355GNH | Chinese weathering steel with comparable strength. Check for equivalence on a case‑by‑case basis, especially for weldability and toughness. |
Notes:
- EN 10155 has been superseded; for new projects always specify EN 10025-5 S355K2W.
- Welding procedure qualifications shall include consideration of the weathering alloying elements to ensure matching corrosion resistance and mechanical properties.
- Preheating may be required for thicknesses above 30 mm; follow recommendations of the consumable manufacturer.
- Minimum forming radii for cold work shall respect the recommendations of the steel producer; typical r/t ratios are ≥2 for transverse bends.
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