ASTM A500 STEEL HOLLOW SECTIONS

Production Tolerance of ASTM A500

Engineers often wonder why there are significantly fewer options for A53 pipes compared to A500 pipes.

A53 pipes are designated using a nominal pipe diameter in inches, along with one of three scheduled wall thicknesses. They are sized this way to accommodate A53 pipes' intended purpose-transporting pressurized steam, air, or water-requiring compatibility with standardized fittings and valves.

Such requirements are not applicable to A500 tubes, allowing for more precise and efficient designation. A500 rounds include the outside diameter and wall thickness in inches, measured to three decimal places. For example, when using an A500 round for a building column, an HSS8.625×0.322 can be specified with an outside diameter (OD) tolerance of +/-0.75% and a wall tolerance of +/-10%. In contrast, the A53 equivalent, an 8-inch standard pipe, has an OD tolerance of +/-1% and a wall tolerance of -12.5%. This highlights that A500 rounds have superior OD and wall tolerances.

Choose A500 rounds for your structural tubing needs, benefiting from their superior tolerances and the flexibility they offer in meeting specific requirements for wall thickness and outside diameter

A500 Outside Dimensional Tolerances for Square & Rectangular Steel tubing

The chart below describes the exact outside dimensional tolerances for A500 carbon steel.

A500 Outside Dimensional Tolerances for Square & Rectangular Steel tubing

A500 Outside Dimensional Tolerances for Square Tubing

1. Outside Dimensions (Width and Height):

The outside dimensions (width and height) of square tubing are typically subject to the following tolerances:
Width and Height Tolerance: +/- 0.020″ (0.5 mm)

2. Squareness of Sides:
The difference between diagonals of the same cross-section must not exceed 1% of the nominal dimensions.

A500 Outside Dimensional Tolerances for Rectangular Tubing

1. Outside Dimensions (Width and Height):

The outside dimensions (width and height) of rectangular tubing are typically subject to the following tolerances:

Width Tolerance: +/- 0.020″ (0.5 mm)

Height Tolerance: +/- 0.010″ (0.25 mm)

2. Squareness of Sides:

The difference between diagonals of the same cross-section must not exceed 1% of the nominal dimensions.

If you have specific tolerance requirements for your project, it's advisable to communicate these requirements clearly with UNIACERO's engineer.

A500 Carbon Steel Twist Tolerances for Square & Rectangular Structural Tubing

ASTM A500 does not specifically provide twist tolerances for square and rectangular structural tubing. However, twist tolerance requirements can be derived from general industry standards and practices applicable to structural steel products.

Twist is typically defined as the rotation of one end of the tubing relative to the other end along the longitudinal axis. It is measured in degrees per unit length (e.g., degrees per foot).

Maximum Twist: The maximum twist allowable for square and rectangular tubing is often specified as a certain number of degrees per specified length (e.g., per foot).

Industry Standards: Industry standards such as ASTM A6/A6M, which covers general requirements for rolled structural steel bars, plates, shapes, and sheet piling, may provide guidance on allowable twist tolerances indirectly applicable to structural tubing.

Common Practice: In practice, twist tolerances for square and rectangular tubing can vary depending on the manufacturing method, size, and specific customer requirements.

Typically, twist tolerances are specified based on customer drawings, project specifications, or agreed-upon standards between the manufacturer and customer.

Manufacturing Process of ASTM A500 ERW Structural Pipe

ASTM A500 Carbon Steel Structural Tubing Benefits

ASTM A500 carbon steel structural tubing combines strength, durability, and versatility, making it a preferred choice for engineers and architects in diverse construction and industrial applications.

High Strength: Designed to withstand significant loads and stresses, providing structural integrity and reliability.

Durability: Resistant to wear, abrasion, and environmental factors, ensuring long-term performance in various conditions.

Wide Range of Shapes: Available in round, square, rectangular, and special shapes, catering to diverse structural design requirements.

Various Sizes: Offers flexibility with a range of sizes and dimensions, accommodating different project needs.

Economical Production: Cold-formed manufacturing process is cost-effective compared to hot-rolled steel, without compromising quality or strength.

Weldability: Easily weldable using standard welding techniques, facilitating efficient fabrication and assembly.

Machinability: Can be cut, drilled, and machined to precise specifications, enhancing flexibility in construction.

Common Industry Applications

Construction Industry: Used in the construction industry for structural supports, such as columns and beams in buildings and bridges, as well as for frame structures in steel frameworks for office buildings and industrial warehouses.

Oil and Gas: ASTM A500 pipes are widely applied in pipelines for transporting oil, natural gas, and water due to its high strength, durability, and resistance to harsh conditions.

Automotive Transport: A500 steel provides good mechanical properties, including strength and durability, and is often used in structural tubing and frameworks where strength is essential.

Mechanical Industry: ASTM A500 steel pipe offers strength, durability, and structural integrity, ideal for hydraulic systems, heavy machinery, and industrial equipment.

Energy: Ideal for the energy sector due to their high strength, durability, and weldability, making them suitable for supporting heavy loads and withstanding harsh conditions.

Machining: Suitable for the machining industry due to A500 steel's high strength, durability, and good fabrication properties, which support the production of precision parts and components.