S355J0WP Weather Resistant Steel Coil
S355J0WP Weather Resistant Steel Coil - EN 10155-1993 Analysis, Properties & Equivalents
In-depth material data for S355J0WP weather resistant steel per EN 10155:1993, including chemical composition, mechanical and thermal properties, international equivalents, and application guidance.
Hot rolling, cold rolling, normalizing rolling, thermomechanical rolling
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S355J0WP Weather Resistant Steel Coil Introduction
S355J0WP is a phosphorus-alloyed structural weathering steel defined in EN 10155:1993 (now superseded by EN 10025-5). With a minimum yield strength of 355 MPa and a Charpy impact energy of 27 J at 0 °C (J0 quality), it offers enhanced atmospheric corrosion resistance through the formation of a dense, adherent protective patina. The addition of phosphorus (0.06–0.15 %), together with chromium and copper, promotes self-passivation in alternating wet/dry conditions, eliminating the need for paint in many structural applications. It is typically supplied in coil, plate, and sheet form, delivered in normalized (+N) or as-rolled (+AR) condition. This material is widely used in bridges, building facades, railway vehicles, shipping containers, and transmission towers where durability and low maintenance are critical. Its good weldability and toughness at low temperatures further extend its suitability for demanding outdoor environments.
S355J0WP Weather Resistant Steel Coil Chemical Composition
The typical chemical composition of S355J0WP according to EN 10155:1993. Phosphorus is deliberately added to enhance weathering resistance. The steel is fully killed and contains sufficient nitrogen-binding elements (e.g., aluminium). Values are maximum unless a range is given.
| Element | Content (wt%) | Remarks |
|---|---|---|
| C | ≤0.12 | |
| Si | ≤0.75 | |
| Mn | ≤1.00 | |
| P | 0.06–0.15 | Enhanced weathering element |
| S | ≤0.035 | |
| Cr | 0.30–1.25 | |
| Ni | ≤0.65 | |
| Cu | 0.25–0.55 |
S355J0WP Weather Resistant Steel Coil Thermal & Electrical Physical Properties
Nominal physical properties for S355J0WP at room temperature unless stated otherwise. These values are typical for low‑alloy structural steels and serve for general engineering calculations.
| Property | Typical Value | Unit | Remarks |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | at 20 °C |
| Modulus of elasticity (E) | 210 | GPa | at 20 °C |
| Shear modulus (G) | 81 | GPa | at 20 °C |
| Poisson's ratio (ν) | 0.3 | – | |
| Thermal expansion coefficient (α) | 12 | ×10⁻⁶/K | 20–100 °C |
| Thermal conductivity (λ) | 45 | W/(m·K) | at 20 °C |
| Specific heat capacity (cₚ) | 460 | J/(kg·K) | at 20 °C |
| Electrical resistivity (ρₑ) | 0.25 | µΩ·m | at 20 °C |
S355J0WP Weather Resistant Steel Coil Mechanical Properties
Mechanical properties of S355J0WP in the delivery condition as specified in EN 10155. Yield strength, tensile strength, elongation, impact energy, and bending test requirements vary with product thickness. Impact test is carried out on Charpy V‑notch specimens at 0 °C for thicknesses ≥6 mm.
| Property | Required Value | Unit | Condition / Thickness (t) |
|---|---|---|---|
| ReH (Yield strength) | ≥355 | MPa | t ≤ 16 mm |
| ReH (Yield strength) | ≥345 | MPa | 16 < t ≤ 40 mm |
| ReH (Yield strength) | ≥335 | MPa | 40 < t ≤ 63 mm |
| ReH (Yield strength) | ≥325 | MPa | 63 < t ≤ 80 mm |
| Rm (Tensile strength) | 470–630 | MPa | t ≤ 80 mm |
| A (Elongation after fracture) | ≥22 | % | t ≤ 40 mm (L₀=5.65√S₀) |
| A (Elongation after fracture) | ≥21 | % | 40 < t ≤ 63 mm |
| A (Elongation after fracture) | ≥20 | % | 63 < t ≤ 80 mm |
| KV (Charpy impact energy) | ≥27 | J | 0 °C, longitudinal, t ≥ 6 mm; average of 3 tests; one individual ≥70 % of average |
| Bend test (mandrel diameter) | 1t | – | t ≤ 16 mm, bending axis parallel to rolling direction |
| Bend test (mandrel diameter) | 2t | – | 16 < t ≤ 40 mm |
| Bend test (mandrel diameter) | 3t | – | 40 < t ≤ 80 mm |
S355J0WP Weather Resistant Steel Coil Identical/Equivalent Standard Grades & Substitute Designations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5:2004 | S355J0WP | Current standard; identical requirements |
| China | GB/T 4171-2008 | Q355GNH | Comparable phosphorus‑alloyed weathering steel; impact test temperature may differ |
| USA | ASTM A588/A588M | Grade B | Similar atmospheric corrosion resistance; check phosphorus content |
| USA | ASTM A242/A242M | Type 1 | Lower yield strength; not an exact match |
| India | IS 11587:2011 | IRSM 41‑97 / Grade E 450 | High‑strength weathering steel; properties may vary |
S355J0WP Weather Resistant Steel Coil Application Introduction
S355J0WP is used wherever structural integrity and long‑term durability under atmospheric exposure are required without the need for painting. The stable rust patina forms after a few wet‑dry cycles and reduces maintenance. It is not recommended for submerged or buried conditions, nor for extremely aggressive marine/industrial atmospheres with high chloride or continual humidity. Welding must be performed with low‑hydrogen procedures and matching weathering filler metals to preserve corrosion resistance.
Product Applications: Weathering steel bridge beams and girders, Welded structural sections for buildings, Railway wagon bodies and chassis, Container corner castings and frames, Tubular poles for power lines, Architectural cladding and decorative panels
Processed into products: Main bridge girders and cross‑beams, Structural columns and trusses, Railway car side frames and underframes, Container corner fittings and base rails, Tubular lighting columns and antenna supports, Welded plate girders for industrial halls
Application industries: Bridge construction, Civil engineering and infrastructure, Railway rolling stock, Shipping containers and intermodal transport, Architectural exposed structures (facades, sculptures), Transmission towers and poles, Mining and heavy equipment (corrosion‑prone parts)
S355J0WP Weather Resistant Steel Coil Close/Similar Substitute Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10155 / EN 10025-5 | S355J2WP | Same strength and P content; higher impact energy at –20 °C (J2) |
| Europe | EN 10155 / EN 10025-5 | S355J0W | Weathering grade without enhanced P; higher Ni/Cu; lower corrosion resistance |
| Europe | EN 10155 / EN 10025-5 | S355J2W | Improved toughness variant (J2) of the non‑phosphorus series |
| Europe | EN 10025-5 | S355K2W | Even higher toughness (–20 °C, KV≥40 J); suitable for thicker sections |
| China | GB/T 4171 | Q345GNHL | Similar yield class; check exact chemical limits |
| International | ISO 4952 | FeE355GNH | Weathering steel with analogous strength; may have different impact requirements |
Notes:
Additional notes:
- S355J0WP is delivered with inspection certificates (e.g., EN 10204 type 3.1 or 3.2).
- Ultrasonic testing may be agreed upon for thicker plates.
- For exposed structural applications, detailing should avoid water traps and crevices to ensure uniform patina formation.
- The steel is not intended for post‑heat treatment; welding should be limited to qualified procedures.
- Coil and sheet can be processed by cold forming; minimum bending radii should follow the supplier's recommendations.
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