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

ASTM A500 Grade A Round Structural Tubing

The outside diameter shall not vary more than 60.5 percent, rounded to the nearest 0.005 in. [0.1 mm], from the specified outside diameter for specified outside diameters 1.900 in. [48 mm] and smaller, and 6 0.75 percent, rounded to the nearest 0.005 in. [0.1 mm], for specified outside diameters 2.00 in. [5 cm] and larger. Outside diameter measurements should be taken at least 2 in. [5 cm] from the tubing’s ends.

ASTM A500 Grade A Square and Rectangular Structural Tubing

The outside dimensions, measured across the flats at least 2 in. [5 cm] from the ends of the tubing, should not differ from the prescribed outside dimensions by more than the appropriate amount stated, which includes an allowance for convexity or concavity.

-Wall Thickness of ASTM A500 Grade A Pipes

The minimum wall thickness at any point of measurement on the ASTM A500 Grade A tube should not be less than 10% of the specified wall thickness. The maximum wall thickness of welded tubing, excluding the weld seam, shall be no more than 10% larger than the prescribed wall thickness.

The wall thickness standards for square and rectangular tubes shall apply only to the flats’ centers.

-Length of ASTM A500 Grade A Pipes

ASTM A500 Grade A Structural tubing is typically manufactured in random lengths of 5ft [1.5 m] or more, multiple lengths, and specialized lengths. Consult Section 4 for more information. When ordering particular lengths, the length tolerance must be in compliance.

-Straightness of ASTM A500 Grade A Pipes

The allowed deviation for ASTM A500 Grade A structural tube straightness shall be 1/8in. times the number of feet [10 mm times the number of meters] divided by 5.

-Squareness of Sides of ASTM A500 Grade A Pipes

For ASTM A500 Grade A square and rectangular structural tubing, adjacent sides shall be square (90°), with a permissible variation of 62°max.

-Radius of Corners of ASTM A500 Grade A Pipes

Each outer corner radius of a square or rectangular structural tubing section shall not be larger than three times the required wall thickness.

-Twist of ASTM A500 Grade A Pipes

The allowed twist variations in ASTM A500 Grade A square and rectangular structural tubing are listed in the standard. The twist is calculated by placing one end of the tubing on a flat surface plate, measuring the height that each corner on the bottom side of the tubing extends above the surface plate near the opposite ends of the tubing, and calculating the twist (the difference in heights of such corners), except that for heavier sections, a suitable measuring device may be used to determine twist. Twist measures must be obtained at least 2 inches (5 cm) from the tubing’s ends.

ASTM A500 Grade A Marking of TUSPIPE

  • The following information must be legibly inscribed on each length of structural tubing: manufacturer’s name, brand, or trademark; specification designation (year of issuance is not necessary); and grade letter.
  • The information given in (1) may be marked on a tag firmly connected to each bundle for structural tubing with a specified outer diameter or big flat dimension of 4 in. [10 cm] or less.
  • Bar Coding—In addition to the standards in (1) and (2), the manufacturer must be able to use bar coding as an additional way of identification. When a purchase order specifies a certain bar-coding system, that system must be used.

NOTE—In the absence of a purchase order specifying a different bar-coding method, it is suggested that bar coding adhere to AIAG Standard B-1.

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