Description
S355K2 – Structural Steel & Steel Plate
Table of Contents
- Introduction to S355K2
- Chemical Composition
- Mechanical Properties
- Applications of S355K2
- Comparison with Other Grades
- Welding and Fabrication
- Conclusion
1. Introduction to S355K2
S355K2 is a high-strength structural steel grade that is commonly used in construction and engineering applications. It belongs to the European standard EN 10025 and is known for its excellent mechanical properties and versatility. S355K2 steel is particularly valued for its good weldability, which makes it suitable for various structural applications, including bridges, buildings, and heavy machinery.
2. Chemical Composition
The chemical composition of S355K2 steel plays a crucial role in determining its mechanical properties. The typical composition includes:
- Carbon (C): ≤ 0.20%
- Silicon (Si): ≤ 0.50%
- Manganese (Mn): 1.50 – 2.00%
- Phosphorus (P): ≤ 0.045%
- Sulfur (S): ≤ 0.045%
- Nitrogen (N): ≤ 0.012%
- Iron (Fe): Balance
This composition ensures that S355K2 steel exhibits high tensile strength and good impact resistance, making it suitable for structural applications in various environments.
3. Mechanical Properties
S355K2 is characterized by its impressive mechanical properties:
| Property | Value |
|---|---|
| Yield Strength (min) | 355 MPa |
| Tensile Strength | 470 – 630 MPa |
| Elongation (min) | 20% |
| Impact Energy (at -20°C) | 27 J (minimum) |
These properties make S355K2 an ideal choice for construction projects requiring high durability and structural integrity.
4. Applications of S355K2
S355K2 steel is widely utilized in various applications due to its excellent properties. Some common uses include:
- Construction: Used in beams, columns, and other structural components in buildings.
- Bridges: Ideal for bridge construction due to its high strength-to-weight ratio.
- Heavy Machinery: Employed in manufacturing components for cranes and other heavy equipment.
- Shipbuilding: Utilized in ship hulls and other structural parts requiring high toughness.
The versatility of S355K2 allows it to perform effectively in a wide range of industrial sectors.
5. Comparison with Other Grades
S355K2 is part of the S355 family of steel grades, which also includes S355J2 and S355NL. Here’s a brief comparison:
| Grade | Yield Strength | Impact Toughness | Typical Applications |
|---|---|---|---|
| S355K2 | 355 MPa | -20°C | Structural components, bridges |
| S355J2 | 355 MPa | -20°C | General structural steel |
| S355NL | 355 MPa | -50°C | Low-temperature applications |
Each grade has its specific advantages depending on the requirements of the application, with S355K2 being particularly favored for its balance of strength and toughness.
6. Welding and Fabrication
Welding S355K2 requires attention to detail due to its composition. It can be welded using standard methods, including:
- Arc Welding
- MIG/MAG Welding
- TIG Welding
It’s essential to follow proper preheating and post-weld heat treatment procedures to avoid any cracking or failure in the welds. The weldability of S355K2 is generally good, allowing for the production of complex structures with high reliability.
