EN10025-5 S355J2W Weather Resistant Steel Coil
EN10025-5 S355J2W Weather Resistant Steel Coil: Properties & Equivalents
Complete data sheet for S355J2W weather resistant structural steel according to EN 10025-5, including chemical composition, mechanical properties, thermal and electrical physical properties, international equivalents, and application guidance.
Hot rolling, normalizing rolling, welding, cutting, forming, machining
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EN10025-5 S355J2W Weather Resistant Steel Coil Introduction
EN10025-5 S355J2W is a structural steel with improved atmospheric corrosion resistance (weathering steel), widely used in exposed applications. Its controlled alloying with chromium, copper and nickel forms a dense, adherent patina that protects against further corrosion, often eliminating the need for painting. With a minimum yield strength of 355 MPa for thickness ≤ 16 mm and guaranteed impact energy of 27 J at -20°C (J2), it offers a balanced combination of strength, toughness and corrosion durability. Typical delivery condition is hot-rolled or normalized rolled. It is suitable for welded, bolted and riveted structures in bridges, buildings, containers and railway vehicles.
EN10025-5 S355J2W Weather Resistant Steel Coil Chemical Composition
The chemical composition of S355J2W as specified in EN 10025-5:2004. The alloying elements Cu, Cr and Ni are added to achieve enhanced atmospheric corrosion resistance. The maximum carbon content is limited to ensure good weldability. Values are ladle analysis percentages by mass.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| C | ≤ 0.19 | Max |
| Si | ≤ 0.55 | Max |
| Mn | 0.45 – 1.60 | Range |
| P | ≤ 0.035 | Max |
| S | ≤ 0.035 | Max |
| Cr | 0.35 – 0.85 | Essential for patina formation |
| Cu | 0.20 – 0.60 | Essential for patina formation |
| Ni | ≤ 0.70 | Enhances toughness and helps patina adhesion |
| * Al, V, Nb, Ti | May be added for grain refinement | Optional, at manufacturer's discretion |
EN10025-5 S355J2W Weather Resistant Steel Coil Thermal & Electrical Physical Properties
Typical physical properties for S355J2W grade at room temperature (20°C) and for relevant temperature ranges. These values are not mandatory requirements but serve as engineering reference data. Thermal expansion coefficient is given for the temperature interval between 20°C and 100°C.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | at 20°C |
| Modulus of elasticity (E) | 210 | GPa | at 20°C |
| Shear modulus (G) | 80 | GPa | at 20°C |
| Poisson's ratio (ν) | 0.3 | — | at 20°C |
| Thermal expansion coefficient (α) | 11.1 × 10⁻⁶ | /K | 20°C to 100°C |
| Thermal conductivity (λ) | 42.6 | W/(m·K) | at 20°C |
| Specific heat capacity | 460 | J/(kg·K) | at 20°C |
| Electric resistivity (ρₑ) | 0.16 – 0.25 | µΩ·m | at 20°C |
EN10025-5 S355J2W Weather Resistant Steel Coil Mechanical Properties
Mechanical properties of S355J2W according to EN 10025-5. The values are minimum requirements for the specified product thickness range, except for tensile strength which is a range. Impact test is carried out on Charpy-V specimens (longitudinal). Bending test is performed at room temperature with the given mandrel diameter.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | ≥ 355 | MPa | Thickness t ≤ 16 mm |
| Yield strength (ReH) | ≥ 345 | MPa | 16 < t ≤ 40 mm |
| Yield strength (ReH) | ≥ 335 | MPa | 40 < t ≤ 63 mm |
| Yield strength (ReH) | ≥ 325 | MPa | 63 < t ≤ 80 mm |
| Yield strength (ReH) | ≥ 315 | MPa | 80 < t ≤ 100 mm |
| Yield strength (ReH) | ≥ 295 | MPa | 100 < t ≤ 150 mm |
| Tensile strength (Rm) | 470 – 630 | MPa | t ≤ 100 mm |
| Tensile strength (Rm) | 450 – 600 | MPa | 100 < t ≤ 150 mm |
| Elongation (A) | ≥ 22 | % | t ≤ 40 mm, longitudinal (L₀ = 5.65√S₀) |
| Elongation (A) | ≥ 21 | % | 40 < t ≤ 63 mm |
| Elongation (A) | ≥ 20 | % | 63 < t ≤ 100 mm |
| Elongation (A) | to be agreed | % | 100 < t ≤ 150 mm |
| Impact energy (KV₂) | ≥ 27 at -20°C | J | Longitudinal Charpy-V |
| Bend test (180°) | mandrel diameter = 1.0 t | – | t ≤ 16 mm |
| Bend test (180°) | mandrel diameter = 1.5 t | – | 16 < t ≤ 40 mm |
| Bend test (180°) | mandrel diameter = 2.0 t | – | 40 < t ≤ 63 mm |
| Bend test (180°) | mandrel diameter = 2.5 t | – | 63 < t ≤ 80 mm |
| Bend test (180°) | mandrel diameter = 3.0 t | – | 80 < t ≤ 100 mm |
EN10025-5 S355J2W Weather Resistant Steel Coil Fully Equivalent Standards & Replaceable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025-5 | S355J2W | Original harmonized European standard |
| Germany | DIN EN 10025-5 | S355J2W | Identical adoption |
| France | NF EN 10025-5 | S355J2W | Identical adoption |
| United Kingdom | BS EN 10025-5 | S355J2W | Identical adoption |
| Italy | UNI EN 10025-5 | S355J2W | Identical adoption |
| Spain | UNE EN 10025-5 | S355J2W | Identical adoption |
EN10025-5 S355J2W Weather Resistant Steel Coil Application Introduction
S355J2W is ideally suited for load-bearing structures exposed to the atmosphere, where the natural patina provides long-term corrosion protection without maintenance painting. It can be processed by hot forming, cold forming, and all common welding techniques (preheating may be required for thicker sections). The material is not intended for use in aggressive chemical or marine immersion environments without additional protection.
Typical industries:
Product Applications: Hot-rolled weather resistant steel coils and cut-to-length plates, Weather resistant structural sections (angles, channels, beams), Fabricated steel components after welding and coating (if required), Pre-patinated architectural panels
Processed into products: Bridge girders and crossbeams, Welded box sections for structural frameworks, Container corner posts and rails, Railway wagon underframes and bodies, Transmission tower legs and bracings, Architectural rain-screen panels and cladding
Application industries: Civil engineering and construction (bridges, facades, roofs, frames), Transportation (railway wagons, truck chassis, shipping containers), Energy (transmission towers, wind turbine towers), Port and harbor structures, Architecture and art (outdoor sculptures, landscape elements)
EN10025-5 S355J2W Weather Resistant Steel Coil Closely Related / Similar Substitute Materials
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| EU | EN 10025-5 | S355J2WP | Higher phosphorus content; improved corrosion resistance but slightly lower toughness |
| EU | EN 10025-5 | S355J0W | Weather resistant steel with impact requirement at 0°C (KV₂ ≥ 27 J @ 0°C), otherwise similar |
| USA | ASTM A588/A588M | Grade A | Atmospheric corrosion-resistant steel; yield 345 MPa (≤100 mm), tensile ≥ 485, chemistry Cu, Cr, Ni comparable |
| USA | ASTM A242/A242M | Type 1 | High-strength low-alloy structural steel with enhanced corrosion resistance, yield ≥ 345 MPa |
| Japan | JIS G 3114 | SMA490AW | Hot-rolled atmospheric corrosion resisting steel with min yield 365 MPa (≤16 mm); chemistry includes Cu-Cr-Ni |
| China | GB/T 4171 | Q355NH | Weathering structural steel; yield min 355 MPa (≤16 mm); chemistry with Cu, Cr, Ni; impact at -20°C available |
Notes:
For thicknesses > 150 mm the mechanical properties shall be agreed at the time of enquiry and order. The improved atmospheric corrosion resistance is based on the formation of a protective oxide layer (patina) that develops under wet/dry cycles. In permanently wet conditions or in contact with de-icing salts, the patina may not form properly and additional coating is advised. The J2 classification guarantees a minimum Charpy impact energy of 27 J at -20°C; for lower temperature applications consider J2 or K2 grades. All data refer to the EN 10025-5 standard and represent the minimum requirements; actual mill certificates may show higher values.
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