ASTM A500 Grade A


ASTM A500 Grade A

The American Society for Testing and Materials (ASTM) A500 steel grade is most commonly used in structural applications. This steel grade covers cold-formed welded and seamless carbon steel pipes used for construction purposes. 

ASTM A500 Grade A is the lowest steel grade in ASTM A500 standard, and therefore it is the most common steel grade used in structural applications. It has good weldability and formability properties, as well as excellent strength properties. In addition, Grade A pipe is also suitable for high-temperature applications. For these reasons, Grade A is the steel grade of choice for many structural applications.

Why choose tuspipe?


Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.

With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.

TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality,  the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.

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ASTM A500 Grade A Square & Rectangle Tubing

The physical parameters necessary to fulfill the three classes of ASTM A500 Grade A square, rectangle, and special shaped tubing are listed below. A flattening test is not a standard requirement for A500 Grade A non-round tubing.

Grade Yield (min) Tensile (min) Elongation (min)
Gr. A 39,000 psi 45,000 psi Determined by wall

ASTM A500 Grade A Round Tubing

Below are the physical properties required to meet the three grades that we produce ASTM A500 Grade A round tubing.  A flattening test is also a standard requirement for round tubing produced to the A500 Grade A.

Grade Yield(min) Tensile (min) Elongation (min)
Gr. A 33,000 psi 45,000 psi Determined by wall

Chemical Requirements of ASTM A500 Grade A

Element Composition, %
Heat analysis Product analysis
Carbon 0.26 0.3
Manganese 1.35 1.4
Phosphorus 0.035 0.035
Sulfur 0.035 0.045
Copper 0.2 0.18

Mechanical Properties of ASTM A500 Grade A Pipes

Mechanical PropertiesMetricEnglishComments
Tensile Strength, Ultimate310 MPa45000 psi
Tensile Strength, Yield230 MPa33400 psi
Elongation at Break25%25%in 50 mm (specified wall thickness 3.05 mm and larger)
Bulk Modulus160 GPa23200 ksiTypical for steel
Shear Modulus80.0 GPa11600 ksiTypical for steel

Physical Properties of ASTM A500 Grade A Pipes

Physical Properties Metric English Comments
Density 7.80 g/cc 0.282 lb/in³ Typical of ASTM Steel

Dimensions of ASTM A500 Grade A

  • Outside Diameter Specification:

    • Round Tubes: The outside diameter should not exceed 60.5% (for 1.900 inches and below) and 60.75% (for 2.00 inches).
    • Square/Rectangular Tubes: Measured at the 2-inch section, it should not deviate from the convexity/concavity tolerance.
  • Wall Thickness Specification:

    • The minimum wall thickness should not be less than 10% of the specified wall thickness.
    • The maximum wall thickness of welded tubing should not exceed 10% of the required wall thickness, excluding the weld seam.
  • Length Specification:

    • Structural tubing may be in random/multiple/special lengths, compliance with length tolerance is required for specific lengths.
  • Straightness Specification:

    • Permissible variation is 1/8 inch per foot.
  • Squareness of Sides Specification:

    • Adjacent sides must be square (90°), with a maximum deviation of 62° permitted.
  • Outer Corner Radius Specification:

    • Each outer corner radius should not exceed three times the required wall thickness.
  • Twist Specification:

    • Adhere to the specified twist tolerances.
    • Twist measurements should not be taken within two inches of the tubing’s ends.
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