ST52-3G steel plate standard structure.
1. Overview. ST52-3G is a low-alloy high-strength structural steel with high strength and good toughness, which is widely used in buildings, bridges, ships, vehicles, pressure vessels and other fields. The standard structure is formulated by the European Standards Organization, which stipulates the requirements for the composition, mechanical properties, and process properties of ST52-3G steel plates. This article will introduce the contents of the ST52-3G steel plate standard structure in detail.
Second, the chemical composition.
The chemical composition of ST52-3G steel plate shall comply with the provisions of EN 10025-2 standard. Among them, the carbon content should be 010%-0.Between 17%, the silicon content should be 010%-0.Between 35%, the manganese content should be 120%-1.Between 60%, the phosphorus content should be 003%-0.08%, the sulfur content should be 003%-0.08%. The content of these elements has an important impact on the mechanical properties and process properties of steel plates.
3. Mechanical properties.
The mechanical properties of ST52-3G steel plate shall comply with the provisions of EN 10025-2 standard. Among them, the yield strength should not be less than 355 MPa, the tensile strength should not be less than 490 MPa, the elongation should not be less than 21%, and the impact energy should not be less than 27 J. These mechanical properties reflect the strength and toughness of steel plates, and are an important basis for evaluating the structural safety of steel plates.
Fourth, process performance.
The process performance of ST52-3G steel plate shall comply with the provisions of EN 10025-2 standard. Among them, the welding performance should meet the requirements of the European standard EN 1016-2, and the processing performance should meet the requirements of the European standard EN 1016-3. These process performance indicators reflect the machinability and weldability of the steel plate, which is an important basis for evaluating whether it is easy to process and weld in the manufacturing process.
5. Size and shape deviation.
The dimensions and shape deviations of ST52-3G steel plates shall be in accordance with the provisions of EN 10025-2 standard. Among them, the thickness deviation shall comply with the requirements of the European standard EN 1016-4, and the width and length deviation shall meet the requirements of the European standard EN 1016-5. These dimensional and shape deviation indicators reflect the accuracy and quality of the steel plate, and are an important basis for evaluating whether it can meet the accuracy requirements during use.
6. Surface quality.
The surface quality of ST52-3G steel plate shall comply with the provisions of EN 10025-2 standard. Among them, there shall be no cracks, inclusions, porosity and other defects on the surface, and non-destructive testing such as ultrasonic flaw detection or magnetic particle flaw detection shall be carried out to ensure that the surface quality meets the requirements. These surface quality indicators reflect the quality and safety of steel plates, and are an important basis for evaluating whether they can meet safety requirements during use.
7. Inspection and test methods.
The inspection and test methods of ST52-3G steel plates shall comply with the provisions of the EN 10025-2 standard. Among them, the inspection and test methods of chemical composition, mechanical properties, process properties, size and shape deviations, surface quality and other indicators should meet the requirements of the corresponding European standards. These inspection and test methods ensure the quality and safety of the steel plate, and are an important basis for evaluating whether it meets the requirements.
8. Packaging, marking and quality certification documents.
The packaging, marking and quality certification documents of ST52-3G steel plates shall comply with the provisions of the EN 10025-2 standard. Among them, the packaging should be made of moisture-proof and rust-proof packaging materials, the logo should be clear and easy to read, and the quality certification documents should include test reports on chemical composition, mechanical properties, process properties, size and shape deviations, surface quality, etc., to ensure that the quality and safety of the steel plate are guaranteed.