Material and Specification
| Material | Specification |
| Seamless Steel | GB 8713 |
GB 8713 is a standard that specifies the requirements for seamless steel tubes for hydraulic purposes. These tubes are widely used in various applications where high-pressure fluid transmission is required. The standard outlines the material composition, mechanical properties, and applications of these tubes.
Chemical Composition
The chemical composition of GB 8713 seamless steel tubes for hydraulic purposes is as follows:
| Element | Composition Range (%) |
| Carbon (C) | 0.17 - 0.24 |
| Silicon (Si) | 0.17 - 0.37 |
| Manganese (Mn) | 0.35 - 0.65 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
Mechanical Properties
The mechanical properties of GB 8713 seamless steel tubes for hydraulic purposes ensure their suitability for high-pressure applications:
| Property | Minimum Value |
| Tensile Strength | 490 MPa |
| Yield Strength | 315 MPa |
| Elongation | ≥ 20% |
| Hardness (HRC) | ≤ 85 |
Steel Grade
The steel grade covered by GB 8713 is 20#, which indicates a low carbon steel with good strength and ductility characteristics. This steel grade is well-suited for hydraulic applications where reliability and durability are essential.
Application
GB 8713 seamless steel tubes find extensive usage in hydraulic systems across various industries. Some common applications include:
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Hydraulic Machinery: These tubes are employed in the construction of hydraulic cylinders, pumps, motors, and other components used in heavy machinery.
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Automotive Industry: GB 8713 tubes are used in the manufacturing of hydraulic systems in vehicles, including brakes, power steering, and suspension systems.
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Agricultural Equipment: Hydraulic systems used in tractors and other agricultural machinery benefit from the strength and pressure-handling capabilities of these tubes.
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Industrial Equipment: Various industrial applications such as construction equipment, material handling machinery, and manufacturing machinery utilize these tubes for their hydraulic needs.
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Construction: GB 8713 tubes play a role in construction machinery like cranes, excavators, and loaders that require efficient hydraulic systems.
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Marine and Offshore: Hydraulic systems in marine equipment and offshore platforms rely on the performance and reliability of these tubes for safe operations.
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