S235JR is a non-alloy structural steel that complies with the European standard EN 10025-2, suitable for manufacturing various structural components and mechanical parts. "S" stands for structural steel, "235" indicates its minimum yield strength of 235 MPa, and "JR" signifies that the material has good ductility and impact properties.

European Standard Indicators

1. Chemical Composition: The chemical composition of S235JR typically includes carbon (C), silicon (Si), manganese (Mn), phosphorus (P), and sulfur (S). Among these, the carbon content does not exceed 0.22%, silicon content is usually between 0.12-0.35%, manganese content does not exceed 1.7%, and the contents of phosphorus and sulfur do not exceed 0.045% each.

2. Yield Strength: The minimum yield strength of S235JR is 235 MPa, which is the stress level at which the material begins to undergo permanent deformation.

3. Tensile Strength: The tensile strength of S235JR ranges between 360-510 MPa, which is the maximum stress the material can withstand during stretching.

4. Elongation: In tensile tests, the elongation of S235JR is typically no less than 18%, indicating the material's good plastic deformation capability.

5. Impact Absorbed Energy: The impact absorbed energy of S235JR at 0°C is generally required to be no less than 27J to ensure the material's toughness under low-temperature conditions.

6. Hardness: The Brinell hardness (HB) of S235JR typically ranges between 120-170.

7. Weldability: S235JR has good weldability and is suitable for various welding methods such as arc welding and gas-shielded welding.

8. Surface Quality: According to the EN 10025-2 standard, the surface quality of S235JR steel plates is classified into ordinary grade (FA) and higher grade (FB), requiring the surface to be free of defects such as cracks, folds, bubbles, and inclusions.

9. Dimensional Specifications: S235JR steel plates come in various dimensional specifications, including different thicknesses, widths, and lengths, to meet diverse application needs.

10. Application Fields: S235JR is widely used in building structures, bridges, ships, vehicle components, and the manufacturing of various tools, cutting tools, molds, and measuring instruments.

Summary

As a non-alloy structural steel, S235JR is widely used under the European standard EN 10025-2 due to its excellent mechanical properties, weldability, and processability. Through precise chemical composition control and strict production processes, S235JR steel plates can meet the needs of various structural and mechanical engineering applications. Its good ductility and impact properties make it an ideal choice for structural materials in various environments.