S355J2G1W Weather Resistant Steel Coil
S355J2G1W Weather Resistant Steel Coil | EN 10155-1993 | High Strength Structural Steel with Improved Atmospheric Corrosion Resistance
Comprehensive technical data for S355J2G1W weather resistant steel coil according to EN 10155-1993, including chemical composition, mechanical properties, physical properties, equivalent grades, and applications in structural engineering, bridges, and architectural projects exposed to atmosphere without protective coating.
Welding, bolting, riveting, cold forming, hot forming, cutting, machining
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S355J2G1W Weather Resistant Steel Coil Introduction
S355J2G1W is a weather resistant structural steel defined in EN 10155:1993. It offers a minimum yield strength of 355 MPa and guarantees impact energy of 27 J at -20°C (longitudinal). The 'W' indicates improved atmospheric corrosion resistance through alloying elements such as copper and chromium, allowing the formation of a protective patina when exposed to outdoor conditions. This steel can be used in the unprotected condition, reducing maintenance costs. It is delivered in normalized or normalized rolled condition, suitable for welded, bolted, and riveted structures. Typical applications include bridges, containers, railway vehicles, and architectural façades. The grade S355J2G1W is a fully killed steel (G1) with fine grain practice, ensuring good toughness and weldability.
S355J2G1W Weather Resistant Steel Coil Chemical Composition
The chemical composition of S355J2G1W is designed to provide both mechanical strength and improved corrosion resistance. Elements such as copper (Cu), chromium (Cr), and nickel (Ni) form a dense, adherent oxide layer (patina) that protects the base metal from further atmospheric corrosion. The limits below are in accordance with EN 10155:1993. The steel is fully killed (G1) and fine-grained, with controlled nitrogen content to ensure good toughness.
| Element | Standard Value (%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.16 | Ladle analysis |
| Silicon (Si) | ≤ 0.50 | Ladle analysis |
| Manganese (Mn) | 0.50 – 1.50 | Ladle analysis |
| Phosphorus (P) | ≤ 0.035 | Ladle analysis |
| Sulfur (S) | ≤ 0.035 | Ladle analysis |
| Chromium (Cr) | 0.40 – 0.80 | Essential for corrosion resistance |
| Copper (Cu) | 0.25 – 0.55 | Key element for patina formation |
| Nickel (Ni) | ≤ 0.65 | Enhances toughness and corrosion resistance |
| Molybdenum (Mo) | ≤ 0.30 | Optional; may improve strength |
| Nitrogen (N) | ≤ 0.009 | Controlled for fine grain and toughness |
| Zirconium (Zr) | ≤ 0.15 | For sulfide shape control (optional) |
S355J2G1W Weather Resistant Steel Coil Physical and Thermal Properties
The values below represent typical physical properties of S355J2G1W structural steel. These are not specified in the standard but are based on measurements for low-alloy steels with similar composition. Slight variations may occur depending on the exact chemical analysis and heat treatment condition. The corrosion rate in unpainted atmospheric exposure is classified in EN 10155.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | At 20°C |
| Young's Modulus (E) | 210 | GPa | At 20°C |
| Shear Modulus (G) | 81 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.3 | — | Within elastic range |
| Thermal Expansion Coefficient (α) | 11.9 × 10⁻⁶ | K⁻¹ | 20°C – 100°C |
| Thermal Expansion Coefficient (α) | 12.5 × 10⁻⁶ | K⁻¹ | 20°C – 200°C |
| Thermal Expansion Coefficient (α) | 13.3 × 10⁻⁶ | K⁻¹ | 20°C – 300°C |
| Thermal Conductivity (λ) | 42 | W/(m·K) | At 20°C |
| Specific Heat Capacity (Cp) | 460 | J/(kg·K) | At 20°C |
| Electrical Resistivity (ρe) | 0.22 – 0.25 | µΩ·m | At 20°C |
S355J2G1W Weather Resistant Steel Coil Mechanical Properties
The mechanical properties below are the minimum specified values according to EN 10155:1993 for S355J2G1W steel in normalized or normalized rolled condition. Properties vary with product thickness; the table lists the applicable ranges. Impact testing is performed on longitudinal Charpy-V specimens at -20°C. The bend test is carried out with the specified mandrel diameter to ensure adequate ductility.
| Property | Required Value | Unit | Test Condition / Thickness Range |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 355 | MPa | Thickness ≤ 16 mm |
| Yield Strength (ReH) | ≥ 345 | MPa | 16 mm < Thickness ≤ 40 mm |
| Yield Strength (ReH) | ≥ 335 | MPa | 40 mm < Thickness ≤ 63 mm |
| Yield Strength (ReH) | ≥ 325 | MPa | 63 mm < Thickness ≤ 80 mm |
| Yield Strength (ReH) | ≥ 315 | MPa | 80 mm < Thickness ≤ 100 mm |
| Tensile Strength (Rm) | 470 – 630 | MPa | Thickness ≤ 100 mm |
| Elongation (A, L0 = 5.65√S0) | ≥ 22 | % | Thickness ≤ 40 mm |
| Elongation (A, L0 = 5.65√S0) | ≥ 21 | % | 40 mm < Thickness ≤ 63 mm |
| Elongation (A, L0 = 5.65√S0) | ≥ 20 | % | 63 mm < Thickness ≤ 100 mm |
| Impact Energy (KV, longitudinal) | ≥ 27 | J | At -20°C; average of 3 tests |
| Bend Test (mandrel diameter) | 2a | — | Thickness ≤ 16 mm; bend angle 180° |
| Bend Test (mandrel diameter) | 3a | — | 16 mm < Thickness ≤ 100 mm; bend angle 180° |
S355J2G1W Weather Resistant Steel Coil Directly Equivalent Standards and Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5:2004 | S355J2W | Direct successor to EN 10155:1993; identical chemical and mechanical requirements for thickness ≤ 100 mm; impact at -20°C. |
| International (ISO) | ISO 4952:2003 | S355W (J2 option) | Weather resistant structural steel with the same strength level; requires agreement on impact energy class; can match S355J2W. |
S355J2G1W Weather Resistant Steel Coil Application Introduction
S355J2G1W was primarily developed for unprotected outdoor use where its self-protecting patina eliminates the need for painting. It is widely adopted in the construction and transportation sectors. When exposed to alternating wet and dry cycles, a stable oxide layer forms, initially with an aesthetic rust-brown color, which gradually darkens. The material can be welded, bent, and machined like conventional structural steel, but special welding consumables matching the corrosion resistance should be used. For indoor applications or permanently wet conditions, a protective coating is recommended. The steel performs best in moderate to aggressive industrial or marine atmospheres.
Product Applications: Unpainted bridge girders and box sections, Facade cladding and architectural panels, Shipping containers and intermodal boxes, Railway passenger coaches and freight wagons, Transmission towers and communication masts, Chimney stacks and ductwork, Silos and hoppers for bulk materials
Processed into products: Welded beams and columns for building frames, Bent plates for curved architectural elements, Stiffened panel assemblies for bridges, Rolled angle and channel sections for trusses, Laser-cut and drilled parts for modular containers, Hollow sections for steel pipe structures, Fastener-grade flanges and connectors
Application industries: Bridge construction, Architectural and civil engineering, Railway and rolling stock manufacturing, Container and shipbuilding (non-marine hull), Energy transmission (towers, masts), Agricultural and mining machinery, Industrial chimneys and silos
S355J2G1W Weather Resistant Steel Coil Similar or Comparable Weather Resistant Steels
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5:2004 | S355J0W | Same base strength but impact at 0°C (27 J); less tough than J2 variant. |
| Europe | EN 10025-5:2004 | S355K2W | Higher toughness; impact at -20°C (40 J); slightly stricter chemical limits. |
| USA | ASTM A588 / A588M | Grade B | Yield strength 345 MPa (≤ 100 mm); atmospheric corrosion resistance similar to S355J2G1W; often used interchangeably. |
| USA | ASTM A242 / A242M | Type 1 | Yield strength 345 MPa; higher phosphorus content allowed; for structural and architectural applications. |
| Japan | JIS G3114 | SMA490CW | Yield strength ≥ 365 MPa (≤ 16 mm); impact at 0°C; Cr and Cu content similar; suitable substitution after strength verification. |
| Japan | JIS G3114 | SMA570W | Higher strength (570 MPa tensile); may replace S355J2G1W in weight-optimized designs. |
| China | GB/T 4171 | Q355NHD | Weather resistant structural steel; equivalent to S355J2W under the Chinese standard; impact at -20°C. |
Notes:
- Welding: Use low-hydrogen processes and consumables with matching corrosion resistance (e.g., filler metal containing 0.5% Cu and 0.5% Cr). Preheating may be required for thicker gauges (> 30 mm) depending on carbon equivalent.
- Cold forming: Minimum bend radii should follow EN 10155 recommendations; typically 2t for thickness ≤ 16 mm. The patina may cause slight surface cracking in severe forming operations.
- Surface condition: As-delivered surface is suitable for prompt exposure to weathering; if mill scale is removed, the patina forms more uniformly.
- Further standards: EN 10155 was replaced by EN 10025-5:2004 and later by EN 10025-5:2019. S355J2W is the current designation.
- Availability: Coils and cut-to-length sheets are available from European mills; similar stock under ASTM A588 is often stocked globally.
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