ASTM A500 Specification | A/B/C/D Standards Differences

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erw carbon steel pipe

ASTM A500 is a standard issued by ASTM covering the requirements for cold formed welded and seamless carbon steel structural tubes. ASTM A500 is an important standard issued by the American Society for Testing and Materials (ASTM) that specifies the chemical composition, mechanical properties, and inspection and packaging requirements of ASTM A500. 

ASTM A500 requires that structural steel tubing be made of carbon steel that meets specific chemical composition and mechanical property requirements. This helps to ensure that the pipe can withstand appropriate loads and pressures in a variety of engineering environments.

Production Process

ASTM A500 covers two primary manufacturing processes: cold-formed welding and seamless production. 

Cold-formed welding involves the process of curving flat sheets into tube shapes and connecting them through welding. On the other hand, seamless tubing is formed directly into tube shapes without the need for welding. 

These diverse manufacturing processes provide flexibility in meeting the requirements of different

ASTM A500 Oil Pipe Physical Properties

ASTM A500 has four steel grades A,B,C,D. Different steel grades correspond to different tensile and yield strengths, and carbon content is also different.

ASTM A500 grade A steel has a tensile strength of 400MPa and a yield strength of 290MPa.
Grade B steel has a tensile strength and yield strength of 400MPa and 310MPa respectively.
Grade C steel has a tensile strength and yield strength of 400MPa and 260MPa respectively.
Grade D steel has a tensile strength and yield strength of 400 MPa and 230 MPa respectively.
It can be seen that the tensile strength of ASTM A500 is the same, and the yield strength of grade B steel is the largest, followed by A/C/D.
These mechanical properties, carefully defined, ensure that the tubing will maintain its structural integrity under demanding

Note: Grade D tubing requires heat treatment at a temperature of at least 1100°F (590°C) for more than one hour per inch of thickness.

ASTM A500 Standard Dimensional Provisions

Allowable Deviation of Outside Diameter

For the specified outside diameter of not more than 1.9in (48.3mm) of steel pipe, the change of the outside diameter shall not exceed 0.5%, the specific value shall not exceed 0.005in (0.13mm).

 For tubes with specified outside diameters greater than 2.00in (50.8mm), the outside diameter shall not vary by more than 0.75 per cent to a value not exceeding 0.005in (0.13mm). Measurement of the outside diameter shall be taken at least 2in (50.8mm) from the end of the pipe.

Wall Thickness

The minimum wall thickness measured at any point of the tube shall not vary by more than 10 per cent from the specified wall thickness. 

The maximum wall thickness measured at any point in the pipe, including the value measured at the weld seam, shall not vary by more than 10 per cent from the specified wall thickness.

ASTM A500 Pipe Length

Structural steel pipes are generally produced in any of a number of lengths from 1.5 metres upwards, varied or fixed.

Right Angle

The permissible variation in straightness of structural steel pipe is 10.4mm multiplied by 1/5 of the total length of the pipe in metres.

Corner

Each external corner of a square or rectangular steel pipe shall not exceed 3 times the specified wall thickness of the pipe.

Application Scenarios

Application Scenarios

Construction

ASTM A500 Structural Tubing is widely used in construction to build all types of building structures. Its high strength and durability make it ideal for supporting stairs, frames and floor structures.

Bridge Construction

Bridge structures have extremely high requirements for durability and load capacity, and ASTM A500 structural tubes excel in this area.

 Used in the manufacture of major bridge components such as cross and longitudinal girders, the high strength of ASTM A500 tubing ensures reliable operation of bridges in a variety of environmental conditions.

Communication Towers and Support Structures

Communication towers and support structures require strong materials that can withstand wind and heavy loads, and ASTM A500 structural tubing plays a key role in these demanding applications, ensuring that communication equipment is securely supported while meeting stringent requirements for structural strength and stability.

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