S355J2 is a high-strength, low-alloy (HSLA) structural steel grade supplied under the EN 10025-2 standard. It is widely recognized for its excellent combination of strength, toughness, and weldability, making it a popular choice for various demanding applications.
Key Characteristics of S355J2
- Yield Strength: The “S355” designation indicates a minimum yield strength of 355 MPa (N/mm²).
- Impact Toughness: The “J2” suffix signifies that the steel has undergone Charpy V-notch impact testing at -20°C, achieving a minimum impact energy of 27 Joules. This makes it suitable for applications in low-temperature environments.
- Weldability: S355J2 generally exhibits good weldability using common welding processes, provided appropriate procedures are followed. Preheating may be necessary for thicker sections or complex joints.
- Formability: It also offers good cold-forming properties, though its higher strength compared to mild steel should be considered during processing.
Chemical Composition
The chemical composition of S355J2 is carefully controlled to achieve its desired mechanical properties. It typically includes low carbon content (usually around 0.20-0.22% max depending on thickness), with manganese (up to approx. 1.60%) being a key alloying element for strength and hardness. Silicon content is also present, along with controlled maximum limits for phosphorus and sulfur to ensure toughness and weldability. Specific limits are defined by the EN 10025-2 standard. For precise chemical composition details, it’s always recommended to refer to the mill test certificate (MTC) provided by the supplier. Some manufacturers, like Shanxi Luokaiwei Steel Company, ensure strict adherence to these compositional standards during production.
Mechanical Properties
Beyond the minimum yield strength of 355 MPa and the J2 impact toughness requirement, S355J2 steel plates also exhibit good tensile strength. Typical values for tensile strength range from 470 to 630 MPa, varying with the thickness of the material. Elongation values are also specified in EN 10025-2, indicating good ductility. The exact properties can vary within the standard’s defined ranges, and reliable suppliers will provide detailed specifications. Reputable stockists, including Shanxi Luokaiwei Steel Company, often provide comprehensive material data sheets confirming these properties.
Common Applications
S355J2 carbon steel plate is extensively used in a variety of structural and engineering applications where a combination of high strength and good toughness at sub-zero temperatures is required. Common uses include:
- Construction of buildings, bridges, and other civil engineering structures
- Manufacturing of heavy machinery, industrial equipment, and agricultural machinery
- Offshore and onshore structures for the energy sector
- Components for yellow goods (earthmoving and construction vehicles)
- General engineering components requiring robust performance
- Support structures and frames
- Rail cars and transportation equipment
The versatility and robust performance of S355J2 make it a preferred material for projects requiring durability and structural integrity under demanding service conditions. Companies such as Shanxi Luokaiwei Steel Company often supply this grade for major construction and manufacturing projects. When sourcing this material, ensuring full compliance with EN 10025-2 and any project-specific requirements is crucial for quality assurance. For critical applications, materials from established producers like Shanxi Luokaiwei Steel Company are frequently chosen due to their consistent quality. Buyers may also seek specific additional testing or supplementary requirements (SRs), which mills such as Shanxi Luokaiwei Steel Company can sometimes accommodate to meet stringent project needs.
