Technical Specifications for S355K2W Weathering Steel Plate
- Sep 10, 2026
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Technical Specifications for S355K2W Weathering Steel Plate
1. Basic Technical Specifications
| Item | Technical Specifications |
|---|---|
| Grade | S355K2W |
| Material Number | 1.8967 |
| 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 | ≥ 355 MPa |
| Impact Test Temperature | -20°C |
| Impact Energy | ≥ 40 J |
| Elongation | ≥ 22 % |
| Delivery Condition | Hot-rolled (+AR), normalized (+N), etc.; subject to the order and manufacturer’s agreement. |
2. Chemical Composition
| Element | Content |
|---|---|
| C | ≤ 0.16 % |
| Si | ≤ 0.50 % |
| Mn | 0.50 - 1.50 % |
| P | ≤ 0.030 % |
| S | ≤ 0.030 % |
| Cr | 0.40 - 0.80 % |
| Cu | 0.25 - 0.55 % |
| Ni | ≤ 0.65 % |
| N | ≤ 0.009 |
3. Carbon Equivalent
Typical carbon equivalent for S355K2W weathering steel plates:
CEV ≤ 0.52%
According to the IIW formula:
CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15
4. Mechanical Properties
| Thickness (t) | Yield Strength (ReH) | Tensile Strength (Rm) | Elongation (A) |
|---|---|---|---|
| t ≤ 16 mm | ≥ 355 MPa | 470 - 630 MPa | ≥ 22 % |
| 16 mm < t ≤ 40 mm | ≥ 345 MPa | 470 - 630 MPa | ≥ 22 % |
| 40 mm < t ≤ 63 mm | ≥ 335 MPa | 470 - 630 MPa | ≥ 21 % |
| 63 mm < t ≤ 80 mm | ≥ 325 MPa | 470 - 630 MPa | ≥ 20 % |
| 80 mm < t ≤ 100 mm | ≥ 315 MPa | 470 - 630 MPa | ≥ 20 % |
| 100 mm < t ≤ 150 mm | ≥ 295 MPa | 450 - 600 MPa | ≥ 18 % |
5. Impact Properties
| Item | Requirements |
|---|---|
| Impact Test | Charpy V-notch |
| Impact Temperature | - 20 °C |
| Impact Energy | ≥ 40 J |
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. |
7. Weathering Performance
The alloying element system of S355K2W weathering steel promotes the formation of a relatively dense oxide protective layer on the steel surface. In atmospheric environments characterized by alternating wet and dry conditions, good air circulation, and no excessive concentration of pollutants, this protective layer can reduce the rate of subsequent corrosion.
Actual weathering performance is closely related to humidity, salinity, industrial pollution, wet-dry cycles, drainage conditions, and the presence of long-term water accumulation on the steel surface; therefore, “weathering steel” does not imply that it can be used completely exposed in all environments.
8. Weldability
S355K2W is a weldable structural steel; however, due to its alloying elements and carbon equivalent, specific welding procedures must be determined based on 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
S355K2W weathering steel plates are primarily suitable for applications requiring high structural strength, high impact toughness, and resistance to atmospheric corrosion, such as:
1) Steel bridge structures
2) Highway and railway bridges
3) Steel box girders and truss structures
4) Exposed steel structures in buildings
5) Steel structures in sports venues
6) Power transmission towers and communication towers
7) Exposed structures in industrial plants
8) Landscape architecture and artistic steel structures
9) Containers and transportation equipment
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