ASTM A500 Grade B

ASTM A500 Grade B

ASTM A500 Grade B is under the specification of ASTM A500, which covers cold-formed welded and seamless carbon steel round, square, rectangular, or special shape structural tubing for welded, riveted, or bolted construction of bridges and buildings, and general structural purposes.


ASTM A500 Grade B Square & Rectangle Tubing

The following are the three physical properties required for our ASTM A500 Grade B square, rectangular and special shape tubing. A flattening test is not a standard requirement for ASTM A500 Grade B non-circular tubes.


Yield (min)

Tensile (min)

Elongation (min)

Grade B

46,000 psi

58,000 psi

Determined by wall

ASTM A500 Grade B Round Tubing

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



Tensile (min)

Elongation (min)

Grade B

42,000 psi

58,000 psi

Determined by wall

Chemical Requirements of ASTM A500 Grade B Pipes


Composition, %

Heat analysis

Product analysis
















Physical Properties of ASTM A500 Grade B Pipes

Physical Properties





7.80 g/cc

0.282 lb/in³

Typical of ASTM Steel

Permissible Variations in Dimensions of ASTM A500 Grade B

-Outside Dimensions of ASTM A500 Grade B Pipes

ASTM A500 Grade B Round Structural Tubing

The outside diameter shall not deviate more than 60.5 percent, rounded to the nearest 0.005 in. [0.1 mm], from the specified outside diameter for specified outside diameters of 1.900 in. [48 mm] and smaller, and 60.75 percent, rounded to the nearest 0.005 in. [0.1 mm], from the specified outside diameter for specified outside diameters of 2.00in. [5 cm] and greater. Outside diameter measurements must be taken at least 2 in. [5 cm] from the tube ends.

ASTM A500 Grade B Square and Rectangular Structural Tubing

Outside dimensions, as measured across the flats at least 2in. [5cm] from the tube ends, should not deviate from the required outside dimensions by more than the amount provided, which includes an allowance for convexity or concavity.

- Wall Thickness of ASTM A500 Grade B Pipes

The minimum wall thickness of the ASTM A500 Grade B tube at any point of measurement should not be less than 10% of the stipulated wall thickness. The maximum wall thickness of welded tubing, excluding the weld seam, should not exceed 10% of the prescribed wall thickness.

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

-Length of ASTM A500 Grade B Pipes

Structural tubing is often manufactured in random lengths of 5ft [1.5m] or more, multiple lengths, and specialized lengths. Section 4 should be consulted. When ordering particular lengths, the length tolerance must be in compliance.

-Straightness of ASTM A500 Grade B Pipes

The allowable deviation for ASTM A500 Grade B structural tube straightness must 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 B Pipes

Adjacent sides of ASTM A500 Grade B square and rectangular structural tubes should be square (90°), with a maximum variation of 62° allowed.

-Radius of Corners of ASTM A500 Grade B Pipes

The radius of each outside corner of a square or rectangular structural tubing section should not be more than three times the required wall thickness.

-Twist of ASTM A500 Grade B Pipes

For ASTM A500 Grade B square and rectangular structural tubing, the permissible variations in twist shall be as given in the standard.Twist shall be determined by holding one end of the tubing down 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), with the exception that for heavier sections, a suitable measuring device may be used to determine twist. Twist measures must not be obtained within 2 in. [5cm] of the tubing’s ends.

ASTM A500 Grade B Product Marking of TUSPIPE

  • Each length of structural ASTM A500 GradeB tubing should be legibly marked with the following information: manufacturer’s name, brand, or trademark; specification designation (year of issuance is optional); and grade letter.
  • It is acceptable to indicate the information given in (1) on a tag firmly connected to each bundle for structural tubing with a defined 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 identifying technique. If a certain bar-coding system is stated in the purchase order, it must be used.

In the absence of any bar-coding method mentioned in the purchase order, bar coding should be compatible with AIAG Standard B-1.


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