EN10155 S355K2G1W Weather Resistant Steel Coil
EN10155 S355K2G1W Weather Resistant Steel Coil: Full Data, Equivalents & Uses
Detailed technical data for EN10155 S355K2G1W weather resistant steel coil: chemical composition, mechanical and thermal properties, international equivalents, and application guide.
Hot rolling, cold forming, welding, machining
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EN10155 S355K2G1W Weather Resistant Steel Coil Introduction
S355K2G1W is a structural steel grade defined in the European standard EN 10155:1993, designed for improved atmospheric corrosion resistance (weathering steel). It belongs to the group of weldable fine-grain structural steels with specified minimum yield strength of 355 MPa at room temperature and guaranteed impact toughness at -20°C (K2 quality, min 40 J). The 'G1' suffix indicates a fully killed steel with specific aluminium content for fine-grain practice. Typical applications include bridges, buildings, containers, and outdoor structures where reduced maintenance and enhanced durability against corrosion are required. This grade is typically supplied in the normalised or controlled-rolled condition.
EN10155 S355K2G1W Weather Resistant Steel Coil Chemical Composition
The chemical composition conforms to the requirements of EN 10155:1993 for S355K2G1W. The steel contains deliberate additions of copper and chromium to provide enhanced atmospheric corrosion resistance. Aluminium is present as a grain-refining element to ensure fine-grain practice.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.19 | Max |
| Silicon (Si) | ≤ 0.55 | Max |
| Manganese (Mn) | 0.80 – 1.50 | Range |
| Phosphorus (P) | ≤ 0.035 | Max |
| Sulfur (S) | ≤ 0.035 | Max |
| Chromium (Cr) | 0.40 – 0.80 | Weathering element |
| Nickel (Ni) | ≤ 0.65 | Max (optional) |
| Copper (Cu) | 0.25 – 0.55 | Weathering element |
| Aluminium (Altotal) | ≥ 0.020 | Fine-grain element |
| Nitrogen (N) | ≤ 0.015 | Max (if not bound by other elements) |
EN10155 S355K2G1W Weather Resistant Steel Coil Thermal and Electrical Physical Properties
These typical values apply to structural weathering steel of similar composition. They are not specified in the standard but are provided for engineering calculations.
| Property | Typical Value | Unit | Test Conditions / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Modulus of Elasticity (E) | 205 – 210 | GPa | At 20°C |
| Shear Modulus (G) | ~ 80 | GPa | Calculated from E and ν |
| Poisson's ratio (ν) | 0.28 – 0.30 | - | Elastic range |
| Thermal expansion coefficient (α) | 11.5 × 10⁻⁶ | 1/K | 20 – 100°C |
| Thermal expansion coefficient (α) | 12.5 × 10⁻⁶ | 1/K | 20 – 200°C |
| Thermal expansion coefficient (α) | 13.0 × 10⁻⁶ | 1/K | 20 – 300°C |
| Thermal conductivity (λ) | 40 – 45 | W/(m·K) | At 20°C |
| Specific heat capacity (cp) | ~ 470 | J/(kg·K) | At 20°C |
| Electrical resistivity (ρe) | 0.20 – 0.25 | μΩ·m | At 20°C |
EN10155 S355K2G1W Weather Resistant Steel Coil Mechanical Properties
The mechanical properties depend on the product thickness. The values below represent the minimum requirements for S355K2G1W in the normalised delivery condition unless otherwise stated. Impact tests are performed at -20°C on Charpy-V longitudinal specimens.
| Property | Standard Requirement | Unit | Test Conditions (thickness t in mm) |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 355 | MPa | t ≤ 16 |
| Yield Strength (ReH) | ≥ 345 | MPa | 16 < t ≤ 40 |
| Yield Strength (ReH) | ≥ 335 | MPa | 40 < t ≤ 63 |
| Yield Strength (ReH) | ≥ 325 | MPa | 63 < t ≤ 80 |
| Yield Strength (ReH) | ≥ 315 | MPa | 80 < t ≤ 100 |
| Tensile Strength (Rm) | 470 – 630 | MPa | t ≤ 100 |
| Elongation (A5) | ≥ 22 | % | t ≤ 16, longitudinal |
| Elongation (A5) | ≥ 21 | % | 16 < t ≤ 40, longitudinal |
| Elongation (A5) | ≥ 20 | % | 40 < t ≤ 63, longitudinal |
| Elongation (A5) | ≥ 19 | % | 63 < t ≤ 80, longitudinal |
| Elongation (A5) | ≥ 18 | % | 80 < t ≤ 100, longitudinal |
| Impact Energy (KV, -20°C) | ≥ 40 | J | Longitudinal, t < 12 min 27 J allowed |
| Bend Test (180°) | No cracks | - | Mandrel diameter: 2t for t ≤ 16 |
| Bend Test (180°) | No cracks | - | Mandrel diameter: 3t for 16 < t ≤ 100 |
EN10155 S355K2G1W Weather Resistant Steel Coil Directly Equivalent Material Standards and Alternative Designations
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| Europe | EN 10025-5:2004 | S355K2W+N | Direct successor to EN 10155 S355K2G1W; normalised delivery, identical corrosion resistance and toughness |
| Germany | DIN EN 10155 (withdrawn) | S355K2G1W | Same as original designation |
EN10155 S355K2G1W Weather Resistant Steel Coil Application Introduction
S355K2G1W is ideal for welded structures exposed to the atmosphere where a natural protective rust layer (patina) can form, reducing maintenance. It is suitable for all conventional fabrication processes. In aggressive environments (marine, heavy industrial) additional painting or inspection may be required. Preheating for welding is rarely needed for thinner sections; when required, follow the recommendations for Z-grade structural steels.
Product Applications: Welded bridge girders and box sections, Weathering steel facade panels, Shipping containers and truck trailers, Transmission line poles and lattice towers, Architectural sculptures and landscape structures, Industrial storage tanks and silos
Processed into products: Bridge main beams, cross girders, and stiffeners, Welded rectangular hollow sections (RHS) for building columns, Pressed and folded plates for container walls, Lattice mast legs and base plates, Bent plates for architectural elements, Machined anchor plates and bearing pads
Application industries: Bridge construction, Building and civil engineering, Railway rolling stock and freight containers, Transmission and telecommunication towers, Architectural cladding and sculptures, Offshore wind towers (secondary structures), Mining and heavy equipment
EN10155 S355K2G1W Weather Resistant Steel Coil Similar / Alternative Weathering Steel Grades
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| Europe | EN 10025-5:2004 | S355J2W+N | Similar yield strength but lower impact guarantee (27 J at -20°C instead of 40 J); widely used alternative |
| USA | ASTM A588/A588M | Grade A / Grade B | Yield strength 345 MPa min (Grade B), UV resistant; Grade B has higher manganese, may need thickness adjustment |
| China | GB/T 4171-2008 | Q355NH | Equivalent to S355J2W with impact test at 0°C or -20°C depending on quality; check toughness requirements |
| Japan | JIS G3114 | SMA490AW / SMA490BW | Weldable weathering steel with yield ≥365 MPa (AW) or ≥335 MPa (BW); match thickness and impact specification |
Notes:
- When using EN 10155:1993, note that this standard has been withdrawn and replaced by EN 10025-5. For new designs, the successor grade S355K2W+N should be specified.
- S355K2G1W is fully killed and normally fine-grain treated; thus it can be welded with common methods (SMAW, GMAW, SAW) using matching weathering steel electrodes (e.g., AWS E80C-Ni1 or equivalent).
- The atmospheric corrosion resistance relies on a stable oxide layer; the steel should not be painted unless the environment prevents patina formation (e.g., high chloride exposure).
- For thicknesses above 100 mm, special agreement with the manufacturer is required for mechanical properties.
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