EN 10155 S355K2G2W Weather Resistant Steel
EN 10155 S355K2G2W Weather Resistant Steel - Composition, Properties & Equivalents
Comprehensive technical data for EN 10155 S355K2G2W weather resistant steel plate, including chemical composition, mechanical and thermal properties, international equivalents, and application guidance.
Hot rolling, cold forming, welding, bolting, machining
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EN 10155 S355K2G2W Weather Resistant Steel Introduction
S355K2G2W is a structural weather resistant steel defined in the withdrawn European standard EN 10155:1993. It offers enhanced atmospheric corrosion resistance through the formation of a protective oxide patina, eliminating the need for painting in many environments. The steel exhibits a minimum yield strength of 355 MPa for thicknesses up to 16 mm and guarantees Charpy impact energy of 40 J at -20 °C, making it suitable for welded structures subjected to low temperatures. The 'G2' designation indicates a killed fine-grained steel with improved atmospheric corrosion resistance, while 'W' confirms the weathering properties. Typical applications include bridges, containers, facades, and railway vehicles exposed to outdoor conditions. The grade has been superseded by EN 10025-5 S355K2W, which maintains equivalent chemical and mechanical requirements.
EN 10155 S355K2G2W Weather Resistant Steel Chemical Composition
The chemical composition complies with EN 10155:1993. All values are maximum unless a range is specified. The weathering elements (Cr, Cu, sometimes Ni and P) are controlled to develop a protective patina. The carbon equivalent (CEV) is typically limited to ensure good weldability.
| Element | Standard Value (max, %) | Remarks |
|---|---|---|
| C | ≤ 0.16 | Carbon |
| Si | ≤ 0.50 | Silicon |
| Mn | 0.50 – 1.50 | Manganese |
| P | ≤ 0.035 | Phosphorus, contributes to weathering |
| S | ≤ 0.035 | Sulfur |
| Cr | 0.40 – 0.80 | Chromium |
| Ni | ≤ 0.65 | Nickel |
| Cu | 0.25 – 0.55 | Copper |
| Al total | ≥ 0.020 | Aluminum, for fine grain practice |
| N | ≤ 0.009 | Nitrogen, may be limited for fine grain steels |
| Other | — | Optional additions of Nb, V, Ti may be present for grain refinement |
EN 10155 S355K2G2W Weather Resistant Steel Thermal and Electrical Physical Properties
Physical properties are typical for weather resistant steels and are provided for engineering guidance. Values are comparable to standard structural carbon-manganese steels. The properties may vary slightly with heat treatment and product form.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | kg/dm³ | 20 °C |
| Modulus of Elasticity (E) | 210 | GPa | 20 °C |
| Shear Modulus (G) | 81 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.3 | — | Elastic range |
| Thermal Expansion Coefficient (α) | 12 | 10⁻⁶/K | 20 – 100 °C |
| Thermal Expansion Coefficient (α) | 13 | 10⁻⁶/K | 20 – 300 °C |
| Thermal Conductivity (λ) | 42 | W/(m·K) | 20 °C |
| Specific Heat Capacity (cp) | 480 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρe) | 0.20 – 0.25 | Ω·mm²/m | 20 °C |
EN 10155 S355K2G2W Weather Resistant Steel Mechanical Properties
Mechanical properties valid for product thicknesses as per EN 10155. The minimum yield strength decreases with increasing thickness. Charpy V-notch impact energy is guaranteed for the K2 quality at -20 °C. Data apply to flat products in the normalized (+N) delivery condition.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) min | 355 | MPa | t ≤ 16 mm |
| Yield Strength (ReH) min | 345 | MPa | 16 mm < t ≤ 40 mm |
| Yield Strength (ReH) min | 335 | MPa | 40 mm < t ≤ 63 mm |
| Yield Strength (ReH) min | 325 | MPa | 63 mm < t ≤ 80 mm |
| Yield Strength (ReH) min | 315 | MPa | 80 mm < t ≤ 100 mm |
| Tensile Strength (Rm) | 470 – 630 | MPa | t ≤ 100 mm |
| Elongation (A) min | 22 | % | Longitudinal, t ≤ 40 mm, L0=5.65√S0 |
| Elongation (A) min | 20 | % | Longitudinal, 40 mm < t ≤ 100 mm |
| Elongation (A) min | 20 | % | Transverse, t ≤ 40 mm |
| Elongation (A) min | 18 | % | Transverse, 40 mm < t ≤ 100 mm |
| Charpy Impact (KV) min | 40 | J | Longitudinal, at -20 °C (K2) |
| Charpy Impact (KV) min | 27 | J | Transverse, at -20 °C (K2) |
EN 10155 S355K2G2W Weather Resistant Steel Full Equivalent Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5:2004 | S355K2W (+N/+AR) | 1.8967, official successor, identical chemical and mechanical requirements |
| Germany | DIN EN 10155 (withdrawn) | S355K2G2W | Original designation; now replaced by DIN EN 10025-5 |
| International | ISO 4952:2006 | Fe510DW K2 (t ≤ 100 mm) | Equivalent weathering steel, similar strength and toughness at -20°C |
| Japan | JIS G 3114 | SMA490CW (499 MPa min Tensile) | Comparable weathering steel, toughness at -5°C; verify impact requirement |
| USA | ASTM A588/A588M | Grade B or K | Similar strength, thickness-dependent; impact requirements not standard |
EN 10155 S355K2G2W Weather Resistant Steel Application Introduction
S355K2G2W steel is designed for load-bearing, welded structures exposed to the atmosphere. The weathering property eliminates initial painting requirements and reduces life-cycle costs. It is widely used in transport, civil engineering, and architectural projects. The grade can be formed and welded with standard procedures, but low hydrogen welding processes are recommended to avoid hydrogen-induced cracking. It is available in plate and sheet form for fabrication into components that must withstand dynamic loads and low temperatures.
Product Applications: Weathering steel bridges, Corten building panels, Open-top freight wagons, ISO shipping containers, Lighting columns and high-mast poles, Silencer shrouds, Exposed structural frames
Processed into products: Bridge box girders and diaphragms, Wagon side walls and underframes, Corner fittings and corner posts of containers, Flanges and webs of welded plate girders, Architectural facade cassette panels, Pole base plates and gussets, Welded engine brackets and supports
Application industries: Bridge construction, Railway rolling stock, Container and shipbuilding (non-marine hull), Architectural cladding and facades, Transmission towers and poles, Mining and earthmoving equipment, Building skeletons and industrial structures
EN 10155 S355K2G2W Weather Resistant Steel Near/Alternative Substitutes – Weather Resistant Steels
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5 | S355J2W (+N) | Similar strength but 'J2' guarantees 40 J at -20°C; slightly different weathering composition |
| Europe | EN 10025-5 | S355K2W (+N) | Variant with improved atmospheric corrosion thanks to higher P & Cr, same toughness |
| USA | ASTM A588/588M | Grade A (345 MPa min YS) | Thickness up to 100 mm; weathering; typically no guaranteed low-temperature impact |
| India | IS 11587 | Fe 540W | Equivalent ISO Fe510D/W; similar yield 350-355 MPa; verify toughness |
| China | GB/T 4171 | Q355GNH | High weathering steel with 355 MPa min YS; usually impact at 0°C or -20°C depending on quality |
Notes:
Welding: Preheating may be necessary depending on plate thickness and hydrogen level. The carbon equivalent (CEV) typically ranges from 0.39 to 0.44. Weathering behaviour: In marine or highly polluted industrial atmospheres, the protective patina may not develop uniformly; periodic washing or design for drainage is recommended. Availability: As EN 10155 is withdrawn, material is now supplied to EN 10025-5; ordering to S355K2W with note 'formerly S355K2G2W' ensures equivalent properties. Certification: 3.1 or 3.2 inspection certificates per EN 10204 are standard.
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