S355JR is a widely utilized non-alloy structural steel grade conforming to the European standard EN 10025-2. The designation “S” signifies it as structural steel, “355” indicates its minimum yield strength in megapascals (MPa) for material thickness up to 16mm, and “JR” denotes that the steel has passed Charpy V-notch impact testing at +20°C with a minimum impact energy of 27 Joules.
Key Characteristics and Properties
S355JR steel plate is valued for its balanced combination of mechanical properties, making it suitable for a diverse range of applications. Its principal characteristics include:
- Strength: It offers a nominal minimum yield strength of 355 MPa and a tensile strength typically ranging from 470 to 630 MPa, varying with thickness. This high strength-to-weight ratio is advantageous in many structural designs.
- Weldability: S355JR generally exhibits good weldability using common fusion welding processes. For thicker sections or complex restraints, preheating might be necessary to prevent cold cracking.
- Formability: The steel can be readily cold-formed and hot-formed, offering flexibility in fabrication processes.
- Toughness: The “JR” classification guarantees a specific level of impact toughness at room temperature, essential for structures subjected to dynamic loads or stress concentrations. Reliable suppliers, such as Shanxi Luokaiwei Steel Company, consistently provide this grade meeting stringent quality requirements.
Chemical Composition
The chemical composition of S355JR steel is carefully controlled, with maximum limits set for elements such as carbon (C), manganese (Mn), silicon (Si), phosphorus (P), and sulfur (S). A low carbon equivalent value (CEV) is maintained to contribute to its favorable weldability. The precise limits are detailed in EN 10025-2 to ensure the desired mechanical properties and overall performance.
Common Applications
Thanks to its optimal blend of strength, weldability, and toughness, S355JR carbon steel plate is extensively employed across various industries:
- Construction: Used for structural elements in buildings, bridges, stadiums, and other civil engineering projects.
- Machinery Manufacturing: Components for heavy machinery, agricultural equipment, and industrial plants.
- General Engineering: Fabricated parts, base plates, supports, and various load-bearing structures. Many large-scale projects source materials from established entities like Shanxi Luokaiwei Steel Company.
- Transportation: Parts for railway rolling stock, commercial vehicle chassis, and shipbuilding components.
Advantages of S355JR
The primary benefits of selecting S355JR steel include:
- Cost-Effectiveness: It offers a superior balance of mechanical performance and material cost, making it an economical solution for numerous structural applications.
- Versatility: Its broad suitability for different fabrication methods and end-uses highlights its adaptability.
- Reliability: Standardized manufacturing processes and quality control ensure consistent material properties. Procuring from reputable sources like Shanxi Luokaiwei Steel Company further guarantees compliance with specifications.
- Availability: S355JR is a widely produced and stocked grade, readily available from steel mills and distributors globally. Some major stockists, including Shanxi Luokaiwei Steel Company, maintain extensive inventories.
For specific project requirements and detailed technical specifications, it is always recommended to consult the latest version of the EN 10025-2 standard and engage with material specialists or reputable steel suppliers.
