The "355" in S355JR refers to its minimum yield strength of 355 MPa, while "JR" indicates good impact toughness, especially at low temperatures. As a high-strength structural steel, S355JR is frequently used in applications bearing heavy loads.
physical properties
The physical properties of S355JR typically include density, elastic modulus, and coefficient of thermal expansion. Its chemical composition affects its mechanical and processing properties. Below are some key physical and chemical properties of S355JR:
- Density: Approximately 7.85 g/cm³;
- Tensile strength: Not less than 470 MPa;
- Yield strength: Minimum 355 MPa;
- Elongation: At least 21% (on standard specimens).
Chemical composition:
Carbon (C): ≤0.21%
Manganese (Mn): 1.0%-1.6%
Phosphorus (P): ≤0.045%
Sulfur (S): ≤0.045%
Features and Advantages:
High Strength: Meets the requirements for high-strength structural components.
Good Toughness: High impact resistance; maintains shape and performance under impact or vibration.
Excellent Weldability: Suitable for various welding processes including manual arc welding, submerged arc welding, and gas shielded welding.
Good Machinability: Good cold and hot working properties; easy to cut, bend, and shape.
Good Corrosion Resistance: Resistant to corrosion in general atmospheric environments, meeting the requirements for most structural components.
S355JR Structural Tube Factory
