ASTM A513 is a specification for electric-resistance-welded carbon and alloy steel tubing used primarily in mechanical and structural applications. It covers welded tubes that are produced from cold-formed, electric-resistance-welded steel with a variety of end uses. These tubes are used extensively in industries such as automotive, construction, and manufacturing.

Key Characteristics:

1. High Strength: ASTM A513 tubes have a high strength-to-weight ratio, which makes them suitable for various structural and mechanical applications where strength and durability are important.

2. Good Weldability: The tubes are designed to be readily weldable, making them suitable for use in structures and components where welding is required.

3. Versatility: Available in various shapes (round, square, rectangular) and sizes, allowing for flexibility in design and application.

4. Dimensional Accuracy: Typically produced with tight tolerances, which ensures consistency and precision in applications.

5. Finish Options: Can be supplied in different finishes, such as galvanized or bare, depending on the application and environmental conditions.

Common Grades:

• ASTM A513 Type 1: Covers carbon steel tubes with a minimum yield strength of 30,000 psi (207 MPa). It is typically used for general-purpose structural and mechanical applications.

• ASTM A513 Type 2: Covers alloy steel tubes with improved mechanical properties compared to Type 1. Alloying elements such as chromium or molybdenum may be added to enhance strength and toughness.

Applications:

• Automotive: Used in vehicle frames, roll cages, and other structural components where strength and durability are crucial.

• Construction: Employed in building frameworks, support structures, and architectural elements.

• Manufacturing: Utilized in machinery, equipment frames, and various mechanical components.

• Agricultural Equipment: Used in the construction of implements and machinery where high strength and resistance to wear are required.

Specifications:

• Chemical Composition: ASTM A513 specifies chemical composition requirements for different grades, which can include carbon, manganese, phosphorus, sulfur, and other elements, depending on the grade.

• Mechanical Properties: Includes requirements for tensile strength, yield strength, elongation, and impact properties, which vary by grade and intended use.

• Dimensions: Available in various wall thicknesses and diameters, with tolerances defined in the specification.

Benefits:

• Consistent Quality: Produced under standardized conditions to ensure consistent quality and performance.

• Customizable: Can be manufactured to meet specific requirements for strength, size, and finish, making it versatile for a wide range of applications.

Considerations:

• Inspection and Testing: Tubes are often subject to testing and inspection to verify compliance with the specifications, including tests for mechanical properties and dimensional accuracy.

• Coatings and Finishes: Depending on the application and environment, tubes might be coated or treated to enhance corrosion resistance or other properties.

When selecting ASTM A513 steel welded tube, it’s important to consider the specific requirements of your application, including mechanical properties, dimensional tolerances, and environmental conditions. This ensures that the material will perform reliably and meet the demands of your project.