S355K2G2W Weather Resistant Steel Coil
S355K2G2W Weather Resistant Steel Coil | EN10155-1993 Properties & Applications
Discover the chemical composition, mechanical properties, and typical physical data for EN10155-1993 S355K2G2W weather resistant steel coil. Includes international equivalents and application guide.
Hot rolling, normalizing rolling, thermomechanical rolling
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S355K2G2W Weather Resistant Steel Coil Introduction
EN10155-1993 S355K2G2W is a high-strength weather-resistant structural steel designed for improved atmospheric corrosion resistance. It belongs to the family of weathering steels, which develop a stable, protective rust-like oxide layer when exposed to normal outdoor weathering, eliminating the need for painting in many applications. With a minimum yield strength of 355 MPa and impact toughness classification K2 (min. 40 J at -20°C), it offers reliable performance in demanding structural applications such as bridges, building facades, and industrial equipment. The G2 designation indicates a fine-grained, fully killed steel with sufficient aluminum content to bind nitrogen, ensuring good weldability and excellent toughness even at low temperatures. This grade is typically supplied as hot-rolled coil, plate, or strip and is widely used for welded, bolted, or riveted structures. The standard EN 10155 has been superseded by EN 10025-5, where the equivalent modern designation is S355K2W, but the technical delivery conditions remain comparable.
S355K2G2W Weather Resistant Steel Coil Chemical Composition
The chemical composition is in accordance with EN 10155:1993 for grade S355K2G2W. The steel is fine-grained, fully killed, with additions of chromium, copper, and nickel to enhance atmospheric corrosion resistance. Sulfur and phosphorus contents are kept low to ensure good toughness and weldability. Optional microalloying elements such as niobium, vanadium, and titanium may be present to refine grain size. Nitrogen is limited to prevent detrimental effects on toughness.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.16 | |
| Silicon (Si) | ≤ 0.50 | |
| Manganese (Mn) | 0.50 – 1.50 | |
| Phosphorus (P) | ≤ 0.030 | Stricter for K2 grades |
| Sulfur (S) | ≤ 0.030 | Stricter for K2 grades |
| Chromium (Cr) | 0.40 – 0.80 | Essential for weathering resistance |
| Copper (Cu) | 0.25 – 0.55 | Enhances patina formation |
| Nickel (Ni) | ≤ 0.65 | Improves toughness and weathering |
| Aluminum (Al total) | ≥ 0.020 | Required for fine grain practice |
| Nitrogen (N) | ≤ 0.009 | Only if Al/N ≥ 2 |
| Niobium (Nb) | ≤ 0.05 | Optional microalloy, grain refiner |
| Vanadium (V) | ≤ 0.10 | Optional microalloy |
| Titanium (Ti) | ≤ 0.10 | Optional microalloy |
S355K2G2W Weather Resistant Steel Coil Physical Properties
The following physical properties are typical reference values for low‑alloy weathering structural steels at room temperature unless otherwise noted. Exact values may vary slightly with composition and processing. These data are useful for structural design, thermal analysis, and electrical engineering calculations.
| Property | Typical Value | Unit | Test Conditions |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | 20°C |
| Modulus of Elasticity (E) | 210 | GPa | 20°C |
| Shear Modulus (G) | 80 | GPa | 20°C |
| Poisson's Ratio (ν) | 0.3 | dimensionless | 20°C |
| Thermal Expansion Coefficient (α) | 11.9 | 10⁻⁶/K | 20–100°C |
| Thermal Conductivity (λ) | 42 | W/m·K | 20°C |
| Specific Heat Capacity (cₚ) | 460 | J/kg·K | 20°C |
| Electrical Resistivity (ρₑ) | 0.16 | µΩ·m | 20°C |
S355K2G2W Weather Resistant Steel Coil Mechanical Properties
The mechanical properties refer to the as-delivered condition and are verified on longitudinal test pieces taken from the product. Yield strength, tensile strength, and elongation values depend on the nominal thickness. At thicknesses below 16 mm, the full 355 MPa minimum yield is obtained; thicker sections have slightly reduced minima. The K2 grade guarantees a minimum impact energy of 40 J at -20°C, ensuring suitability for low-temperature service. A bend test confirms formability without cracking.
| Property | Minimum/Maximum Value | Unit | Test Conditions |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 355 | MPa | t ≤ 16 mm |
| Yield Strength (ReH) | ≥ 345 | MPa | 16 mm < t ≤ 40 mm |
| Yield Strength (ReH) | ≥ 335 | MPa | 40 mm < t ≤ 63 mm |
| Tensile Strength (Rm) | 470 – 630 | MPa | t ≤ 40 mm |
| Tensile Strength (Rm) | 470 – 600 | MPa | 40 mm < t ≤ 63 mm |
| Elongation after Fracture (A) | ≥ 22 | % | L₀ = 5.65√S₀, longitudinal, t ≤ 40 mm |
| Elongation after Fracture (A) | ≥ 21 | % | L₀ = 5.65√S₀, longitudinal, 40 mm < t ≤ 63 mm |
| Impact Energy (KV) | ≥ 40 | J | -20°C, Charpy V, longitudinal, 10×10 mm |
| Bend Test (180°) | Mandrel diameter = 1 × thickness | t ≤ 16 mm | |
| Bend Test (180°) | Mandrel diameter = 2 × thickness | 16 mm < t ≤ 100 mm |
S355K2G2W Weather Resistant Steel Coil Exact Equivalent Material Standards & Substitution Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-5:2019 | S355K2W | Current standard, direct replacement for EN10155 S355K2G2W |
| European Union | EN 10155:1993 | S355K2G2W | Original superseded standard |
S355K2G2W Weather Resistant Steel Coil Application Introduction
S355K2G2W weathering steel coil is ideally suited for outdoor structures that demand a balance of high strength and long-term corrosion resistance without protective paint. Its protective rust patina, once stabilized, significantly reduces maintenance. The material can be cut, welded, and formed using conventional equipment, making it a cost-effective choice for large-scale projects. Key application areas are listed below.
Product Applications: Bridge girders, arches, and decks, Unpainted building facades and cladding, Shipping containers and freight wagons, Transmission line towers and poles, Outdoor industrial storage tanks and silos, Sculptures and architectural elements
Processed into products: Welded I-beams, H-beams, and box sections, Stiffened plates and diaphragms, Bolted connection plates and gussets, Tube and pipe for structural frames, Load-bearing brackets and support arms, Flanges and webs in built-up sections
Application industries: Civil engineering and construction, Bridge building, Railway and transportation, Energy and power transmission, Container and storage tank manufacturing, Architecture and artistic structures
S355K2G2W Weather Resistant Steel Coil Similar / Alternative Weathering Steel Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| United States | ASTM A588/A588M | Grade A / Grade B | Comparable weathering steel with min. yield 345 MPa; toughness requirement not always specified |
| China | GB/T 4171:2008 | Q355NH | Chinese weathering structural steel, 355 MPa yield, similar corrosion resistance |
| Japan | JIS G3114 | SMA490BW / SMA490CW | Rolled steels for welded structures with 490 MPa tensile strength, offset yield ≥335 MPa |
| International | ISO 4952:2003 | Fe355W-1 or Fe355W-1C | ISO grade for improved atmospheric corrosion resistance, comparable to S355K2W |
Notes:
Welding: Low-carbon weathering steels like S355K2G2W are readily weldable by all conventional methods, provided the heat input and cooling conditions are controlled to maintain toughness. Preheating may be necessary for thick sections. Corrosion behavior: The protective patina develops best under cyclic wet‑dry conditions and when chlorides (e.g., de-icing salt, marine spray) are minimal. In aggressive environments, a protective coating may still be required. Forming: The steel can be cold-bent to the minimum radii described in the standard; hot forming should be avoided unless followed by proper normalizing treatment. Inspection: Ultrasonic testing and/or Charpy impact tests are commonly specified for critical structural components.
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