Products Description
Although S235J0 and S235J0W have similar grade names, they differ significantly in material properties and applicable standards.
Firstly, S235J0 is a commonly used carbon structural steel that complies with EN 10025-2. It is mainly used in general engineering structures and construction, offering good weldability and plasticity, suitable for use in standard environments.
However, due to the absence of alloying elements for weather resistance, it is prone to corrosion when exposed to the atmosphere for extended periods, and usually requires coatings or protective measures to prolong its service life.
In contrast, S235J0W is a weathering structural steel that complies with EN 10025-5. This steel contains alloying elements such as copper, chromium, and nickel, which enable it to form a dense and stable protective rust layer when exposed to the atmosphere, greatly enhancing its resistance to atmospheric corrosion.
For this reason, S235J0W is commonly used in structures such as bridges, building facades, transmission towers, containers, and railway vehicles that are exposed outdoors for long periods, reducing maintenance costs for protective coatings.
The difference in chemical composition
EN 10025-2 S235J0 steel plate chemical composition
| Grade | Chemical Composition | ||||||||
| S235J0 | The Element Max (%) | ||||||||
| C | Si | Mn | P | S | N | Cu | |||
| ≤16 | ＞16≤40 | ＞40 | |||||||
| 0.19 | 0.19 | 0.19 | - | 1.50 | 0.040 | 0.040 | 0.014 | 0.60 | |
EN 10025-5 S235J0W steel chemical composition (%)
| Grade | Number | C max. | Si max. | Mn | P | S max. | N max. | Cr | Cu |
| S235J0W | 1.8958 | 0.13 | 0.40 | 0.20 - 0.60 | max. 0.035 | 0.035 | 0.009 | 0.40 - 0.80 | 0.25-0.55 |
The difference in mechanical properties
EN 10025-2 S235J0 steel plate mechanical properties
| Grade | Mechanical Property | |||||||||||||
| S235J0 | Yield Strength mm Min Mpa |
Tensile Strength mm Min Mpa |
||||||||||||
| ≤16 | ＞16 ≤ 40 |
＞40 ≤ 63 |
＞63 ≤ 80 |
＞80 ≤ 100 |
＞100 ≤ 150 |
＞150 ≤ 200 |
＞200 ≤ 250 |
＞250 ≤ 400 |
＜3 | ≥ 3 ≤ 100 |
＞100 ≤ 150 |
＞150 ≤ 250 |
＞250 ≤ 400 |
|
| 235 | 225 | 215 | 215 | 215 | 195 | 185 | 175 | - | 360-510 | 360-510 | 350-500 | 340-490 | - | |
EN 10025-5 S235J0W steel plate mechanical properties
| EN 10025-5 | Min. Yield Strength Reh MPa | Tensile Strength Rm MPa | |||||||
| Nominal Thickness (mm) | Nominal Thickness (mm) | ||||||||
| ≤16 | >16 ≤40 | >40 ≤63 | >63 ≤80 | >80 ≤100 | >100 ≤150 | <3 | >3 ≤100 | >100 ≤150 | |
| S235J0W | 235 | 225 | 215 | 215 | 215 | 195 | 360-510 | 360-510 | 350-500 |
Application
S235J0 is a European standard carbon structural steel, mainly used for manufacturing general welding, bolting, and riveting structures. Since it does not contain alloying elements for weather resistance, it is primarily used in indoor or protected environments, such as industrial buildings, internal bridge structures, machinery supports, and other structural components that are not exposed to the atmosphere for long periods. In these applications, S235J0 can fully utilize its good weldability, plasticity, and mechanical strength.
In contrast, S235J0W is a weathering structural steel improved on the basis of S235J0, specifically designed for structures that are exposed outdoors or subjected to harsh climatic conditions for long periods.
By adding alloying elements such as copper, chromium, nickel, phosphorus, and molybdenum, S235J0W forms a dense and stable protective oxide layer on its surface under atmospheric conditions, greatly enhancing its resistance to corrosion.
Typical applications of S235J0W include external bridge structures, building facades, transmission towers, containers, railway vehicle bodies, and other outdoor facilities.
These applications take full advantage of S235J0W's weather resistance, reducing the frequency of protective coating maintenance while maintaining structural performance and aesthetic appearance.
In summary, S235J0 is more suitable for indoor or protected environments, while S235J0W is designed for long-term outdoor exposure, offering clear advantages in corrosion resistance and maintenance cost.
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