ASTM A519 Seamless Steel Tube: Carbon Alloy Steel Grades SAE4130 For Hydraulic Systems
Introduction
ASTM A519 is a standard specification for seamless carbon and alloy steel mechanical tubing. This specification covers several grades of carbon and alloy steel, with SAE4130 being one of the most commonly used grades in hydraulic systems. In this article, we will explore the material composition, specification, chemical composition, mechanical properties, and applications of ASTM A519 seamless steel tubes with a focus on SAE4130.
Material Specification
The ASTM A519 standard specifies the following requirements for seamless carbon and alloy steel tubing used for mechanical applications:
- Chemical Composition
- Mechanical Properties
- Hardness Requirements
- Heat Treatment
- Manufacture
- Condition/Finish
- Dimensions
- Permissible Variations in Dimensions
- Workmanship, Finish, and Appearance
Chemical Composition - SAE4130
The chemical composition of SAE4130 steel, as per the ASTM A519 standard, is as follows:
| Element | Composition Range (% by weight) |
| Carbon | 0.28 - 0.33 |
| Manganese | 0.40 - 0.60 |
| Phosphorus | 0.040 (max) |
| Sulfur | 0.040 (max) |
| Silicon | 0.15 - 0.35 |
| Chromium | 0.80 - 1.10 |
| Molybdenum | 0.15 - 0.25 |
Mechanical Properties - SAE4130
The mechanical properties of SAE4130 steel, according to ASTM A519, are outlined in the table below:
| Property | Value |
| Tensile Strength | 85,000 - 105,000 psi (586 - 724 MPa) |
| Yield Strength | 70,000 - 90,000 psi (483 - 620 MPa) |
| Elongation | 20% (min) |
| Reduction of Area | 40% (min) |
| Hardness | 156 - 217 Brinell |
Application
SAE4130 steel tubes, manufactured according to the ASTM A519 specification, find extensive use in hydraulic systems due to their excellent strength, toughness, and high durability. These tubes are widely used in the manufacturing of hydraulic cylinders, pumps, valves, and other critical components.
The seamless nature of ASTM A519 tubes ensures smooth fluid flow, minimizing pressure loss and enhancing overall system efficiency. Additionally, the combination of carbon and alloy elements in SAE4130 steel provides good resistance to corrosion and excessive wear, making it ideal for demanding hydraulic applications.
Conclusion
ASTM A519 seamless steel tubes, particularly those made from SAE4130 steel, offer a reliable and robust solution for hydraulic systems. With precise chemical compositions, excellent mechanical properties, and wide-ranging applications, these tubes provide the necessary strength, durability, and resistance required for hydraulic components. By adhering to the ASTM A519 standard, manufacturers ensure the consistent quality and performance of their products, contributing to the safety and efficiency of hydraulic systems across various industries.
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