EN 10155 S355J2G1W Weather Resistant Steel Plate
EN 10155 S355J2G1W Weather Resistant Steel Plate - Complete Material Data & Equivalents
Detailed material specifications for EN 10155 S355J2G1W weather-resistant structural steel plate, including chemical composition, mechanical properties, physical data, international equivalents, and application guidance.
Hot rolling, normalising, thermomechanical rolling, cold forming (bending, pressing), welding (all common methods), thermal cutting
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EN 10155 S355J2G1W Weather Resistant Steel Plate Introduction
S355J2G1W under EN 10155 (now superseded by EN 10025-5) is a weldable fine-grain structural steel with improved atmospheric corrosion resistance (weathering steel). It achieves enhanced weather resistance through controlled alloying with copper, chromium, and nickel, forming a protective patina that reduces maintenance in exposed structures.
- Guaranteed impact energy at -20°C (J2)
- Excellent weldability and cold-forming properties
- Typical yield strength of 355 MPa for thinner gauges
- Available in plates, sheets, and structural sections
EN 10155 S355J2G1W Weather Resistant Steel Plate Chemical Composition
The ladle analysis limits according to EN 10155:1993 for S355J2G1W. The steel is aluminium-killed (fully killed) and contains a balanced combination of corrosion-resisting elements (Cu-Cr-Ni). All values are maximum unless a range is given.
| Element | Normative Value (wt%) | Remarks |
|---|---|---|
| Carbon, C | ≤ 0.16 | |
| Silicon, Si | ≤ 0.50 | |
| Manganese, Mn | 0.50 – 1.50 | |
| Phosphorus, P | ≤ 0.030 | |
| Sulfur, S | ≤ 0.025 | |
| Chromium, Cr | 0.40 – 0.80 | |
| Nickel, Ni | ≤ 0.65 | |
| Copper, Cu | 0.25 – 0.55 | |
| Aluminium, Al | ≥ 0.015 | Total aluminium, for grain refining |
| Vanadium, V | ≤ 0.12 | Optional microalloying element |
| Niobium, Nb | ≤ 0.05 | Optional microalloying element |
| Titanium, Ti | ≤ 0.12 | Optional microalloying element |
| Nitrogen, N | ≤ 0.012 | For Al-killed steel |
| CEV (max) | ≤ 0.45 | Carbon equivalent (t≤30 mm); 0.47 for 30 |
EN 10155 S355J2G1W Weather Resistant Steel Plate Physical and Electrical Properties
The physical properties are indicative for S355J2G1W type weathering steel. Actual values may vary slightly with exact composition and heat treatment. These data are representative for engineering design calculations.
| Property | Typical Value | Unit | Conditions / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Modulus of elasticity (E) | 205 – 210 | GPa | 20°C, static loading |
| Shear modulus (G) | 79 – 81 | GPa | Calculated from E and ν |
| Poisson's ratio (ν) | 0.3 | Elastic range | |
| Thermal expansion coefficient (α) | 12.0 × 10⁻⁶ | K⁻¹ | 20 – 100°C |
| Thermal conductivity (λ) | 25 – 30 | W/(m·K) | 20°C |
| Specific heat capacity (cp) | ~ 460 | J/(kg·K) | 20 – 100°C |
| Electrical resistivity (ρe) | 0.15 – 0.25 × 10⁻⁶ | Ω·m | 20°C |
EN 10155 S355J2G1W Weather Resistant Steel Plate Mechanical Properties
Mechanical properties according to EN 10155:1993 for S355J2G1W in the delivery condition (normalised or thermomechanical rolled). Impact test at -20°C (J2) with Charpy-V longitudinal samples. Properties vary with thickness; values for the most common thickness ranges are listed.
| Property | Nominal Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | ≥ 355 | MPa | Thickness ≤ 16 mm |
| Yield strength (ReH) | ≥ 345 | MPa | 16 < t ≤ 40 mm |
| Yield strength (ReH) | ≥ 335 | MPa | 40 < t ≤ 63 mm |
| Tensile strength (Rm) | 490 – 630 | MPa | t ≤ 16 mm |
| Tensile strength (Rm) | 490 – 630 | MPa | 16 < t ≤ 40 mm |
| Tensile strength (Rm) | 490 – 630 | MPa | 40 < t ≤ 63 mm |
| Elongation after fracture (A) | ≥ 22 | % | Gauge 80 mm, t ≤ 16 mm, transverse |
| Elongation after fracture (A) | ≥ 22 | % | Gauge 80 mm, 16 < t ≤ 40 mm |
| Elongation after fracture (A) | ≥ 21 | % | Gauge 80 mm, 40 < t ≤ 63 mm |
| Impact energy (KV) | ≥ 27 | Joules | -20°C, Charpy-V, longitudinal |
| Bend test (mandrel diameter) | No cracking | D=1a (a=thickness), 180°, for t ≤ 16 mm | |
| Bend test (mandrel diameter) | No cracking | D=2a (a=thickness), 180°, for 16 < t ≤ 40 mm |
EN 10155 S355J2G1W Weather Resistant Steel Plate Exactly Equivalent Material Standards & Substitute Grades
| Country / Region | Standard (Current) | Grade Designation | Remarks |
|---|---|---|---|
| Europe | EN 10025-5:2019 | S355J2W (1.8965) | Direct successor; fully equivalent to the withdrawn EN 10155 S355J2G1W |
| International | ISO 5952-2:2019 | HSA355W | Weathering structural steel, equivalent chemistry and properties |
| USA | ASTM A709/A709M | Grade 50W | Bridge structural steel with atmospheric corrosion resistance; similar strength and weldability |
| Japan | JIS G 3114:2019 | SMA490BW | Hot-rolled atmospheric corrosion resisting structural steel; practically interchangeable |
| China | GB/T 4171-2008 | Q355GNH | High-strength weathering structural steel (formerly Q345GNHL); close match in strength and corrosion class |
EN 10155 S355J2G1W Weather Resistant Steel Plate Application Introduction
S355J2G1W is designed for load-bearing structures where exposure to the atmosphere is intended without protective painting, provided the design allows for the formation of a stable patina. It is widely used in:
- Bridges (beam bridges, box girders, arch bridges)
- Architectural facades and sculptures
- Rolling stock (railway wagons, containers)
- Transmission towers and masts
- Industrial chimneys and pressure vessels
Product Applications: Weather-resistant steel plates for bridge decks and girders, Hot-rolled sections (H-beams, channels, angles, square hollow sections), Container panels and corrugated sheets, Lighting poles and high-mast structures, Façade panels and cladding, Prefabricated structural assemblies
Processed into products: Bridge main beams and cross-girders, Welded box columns and truss nodes, Railway wagon frames and container corner castings, Tower base plates and flange plates, Boom sections and lattice towers, Support brackets and stiffeners for architectural envelopes
Application industries: Civil engineering and infrastructure, Bridge construction, Architectural and structural design, Railway and transport equipment, Power transmission and distribution, Shipbuilding (superstructures)
EN 10155 S355J2G1W Weather Resistant Steel Plate Similar / Alternative Weather Resistant Steels
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5 | S355J0W | Same strength, but impact test at 0°C instead of -20°C |
| Europe | EN 10025-5 | S355K2W | Similar strength and corrosion resistance, impact at -20°C, but slightly different alloying philosophy |
| USA | ASTM A588/A588M | Grade A | Weathering steel with comparable strength and Cu-Cr-Ni alloying; widely used for structural sections and plates |
| USA | ASTM A242/A242M | Type 1 | Earlier weathering steel specification; slightly lower yield strength in some thicknesses |
| China | GB/T 4171 | Q355NH | Very similar mechanical properties and weathering class; frequently substituted in Asian projects |
Notes:
Important: This data is compiled from EN 10155:1993 and current EN 10025-5:2019 references. For design to modern standards, use EN 10025-5 S355J2W (1.8965) which is the direct replacement. Always confirm substitution with local design codes and welding guidelines. The weathering performance depends on the environmental conditions and the design for drainage and ventilated patina formation. In marine environments or continuously wet conditions, supplementary protection may be required.
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