Technical Specifications for S235J0W Weathering Steel Plate
- Sep 11, 2026
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Technical Specifications for S235J0W Weathering Steel Plate
1. Basic Technical Specifications
| Item | Technical Specifications |
|---|---|
| Grade | S235J0W |
| Material Number | 1.8958 |
| Applicable Standard | EN 10025-5 |
| Steel Grade | Weathering Structural Steel / Atmospheric Corrosion-Resistant Steel |
| Thickness | 6.0 - 200.0 mm |
| Width | 1,500.0 - 4,050.0 mm |
| Length | 3,000.0 - 15,000.0 mm |
| Yield Strength | ≥ 235 MPa (t ≤ 16 mm) |
| Impact Energy | ≥ 27 J at 0°C |
| Elongation | ≥ 26 % |
| CEV | ≤ 0.44% |
| Delivery Conditions | Hot-rolled (+AR), normalized (+N), etc.; specific conditions are subject to the order and manufacturer’s agreement. |
| Typical Products | Weathering steel plates, steel strips, structural steel, and bars |
2. Chemical Composition
| Element | Content |
|---|---|
| C | ≤ 0.13 % |
| Si | ≤ 0.40 % |
| Mn | 0.20 - 0.60 % |
| P | ≤ 0.035% |
| S | ≤ 0.035% |
| N | ≤ 0.012% |
| Cr | 0.40 - 0.80% |
| Cu | 0.25 - 0.55% |
| Ni | ≤ 0.65% |
*Data represents typical values from thermal analysis; final values are subject to actual contract terms and the Material Test Certificate (MTC).
3. Carbon Equivalent
CEV ≤ 0.44%
According to the IIW formula:
CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15
A lower carbon equivalent indicates that S235J0W has relatively good weldability.
During actual welding, specific procedures should still be determined based on plate thickness, welding heat input, preheating temperature, ambient temperature, and the welding procedure qualification (WPS/PQR); the need for preheating should not be judged solely based on the CEV.
4. Mechanical Properties
| Thickness (t) | Yield Strength (ReH) | Tensile Strength (Rm) | Elongation (A) |
|---|---|---|---|
| t ≤ 16 mm | ≥ 235 MPa | 360 - 510 MPa | ≥ 26% |
| 16 mm < t ≤ 40 mm | ≥ 225 MPa | 360 - 510 MPa | ≥ 26% |
| 40 mm < t ≤ 63 mm | ≥ 215 MPa | 360 - 510 MPa | ≥ 25% |
| 63 mm < t ≤ 80 mm | ≥ 215 MPa | 360 - 510 MPa | ≥ 24 % |
| 80 mm < t ≤ 100 mm | ≥ 215 MPa | 360 - 510 MPa | ≥ 24 % |
| 100 mm < t ≤ 150 mm | ≥ 195 MPa | 350 - 500 MPa | ≥ 22 % |
* The yield strength of S235J0W decreases as the steel plate thickness increases.
5. Impact Properties
| Steel Grade | Impact Temperature | Impact Energy |
|---|---|---|
| S235J0W | 0 ℃ | ≥ 27 J |
* “J0” is a very important quality grade designation in the S235J0W grade, indicating that the impact test temperature is 0°C.
6. Delivery Conditions
| Condition | Description |
|---|---|
| Hot-rolled (+AR) | The steel plate is delivered directly in the hot-rolled condition after rolling and is suitable for certain conventional structural applications. |
| Normalized (+N) | The microstructure and properties are more uniform, making it more suitable for structural components with higher requirements for toughness and microstructural stability. |
Specific delivery conditions are subject to the terms of the order.
7. Weather Resistance
The primary difference between S235J0W and standard S235 structural steel is its improved atmospheric corrosion resistance.
Elements such as Cr, Cu, and Ni promote the formation of a relatively stable and dense protective oxide layer on the steel’s surface. After natural exposure, the surface typically develops a decorative reddish-brown/dark brown rust layer over time.
Its main advantages include:
1) Good atmospheric corrosion resistance
2) Reduced long-term maintenance and repainting requirements
3) Good structural strength
4) Good weldability
5) Good machinability and formability
6) A natural rusted appearance
7) Suitable for bridges, buildings, railways, and outdoor steel structures
However, it is important to emphasize that weathering steel cannot be used completely exposed in all environments. In environments characterized by prolonged moisture, standing water, high salt content, or marine spray, its weathering performance may decline significantly; specific design considerations should be based on the actual corrosion environment.
8. Weldability
S235J0W is a weldable structural steel; however, due to its alloying elements and carbon equivalent, the specific welding procedure must be determined based on the plate thickness, carbon equivalent, ambient temperature, welding method, welding consumables, heat input, preheating temperature, and interpass temperature.
Welding procedure qualification is particularly important for thick plates, low-temperature environments, or highly constrained welded structures.
9. Typical Applications
S235J0W is primarily suitable for steel structures requiring a certain level of resistance to atmospheric corrosion, such as:
1) Architectural Steel Structures
a) Exposed architectural steel structures
b) Landscape steel structures
c) Outdoor steel components
2) Bridge Engineering
a) Bridge components
b) Bridge deck auxiliary structures
c) Outdoor load-bearing components
3) Railway Engineering
a) Railway facilities
b) Railway bridge components
c) Outdoor steel structures
4) Industrial facilities
a) Outdoor equipment support structures
b) Material storage facilities
c) Steel frames
5) Landscape engineering
a) Landscape walls
b) Sculptures and decorative steel structures
c) Outdoor artistic structures
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