ASTM A500 / A500M

This specification 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 for general structural purposes.This tubing is produced in both welded and seamless sizes with a periphery of 88 in. [2235 mm] or less, and a specified wall thickness of 0.875 in. [22 mm] or less. Grade D requires heat treatment.The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

Chemical Properties

Grades	Carbon, max^A	Manganese, max^A	Phosphorus, max	Sulfur, max	Copper, min^B
Grade A	0.30	1.40	0.045	0.045	0.18
Grade B
Grade D
Grade C	0.27

Note A: For each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage point above the specified maximum for manganese is permitted, up to a maximum of 1.50 % by heat analysis and 1.60 % by product analysis.

Note B: If copper-containing steel is specified in the purchase order.

Mechanical Properties

Grades	Tensile strength, min, psi [MPa]		Yield strength, min, psi [MPa]		Elongation in 2 in. [50 mm], min, %D
Grades	Round Structural Tubing	Shaped Structural Tubing	Round Structural Tubing	Shaped Structural Tubing	Round Structural Tubing	Shaped Structural Tubing
Grade A	45000 [310]		33000 [230]	39000 [270]	25^A
Grade B	58000 [400]		42000 [290]	46000 [315]	23^B
Grade C	62000 [425]		46000 [315]	50000 [345]	21^C
Grade D	58000 [400]		36000 [350]		23^B

Note A: Applies to specified wall thicknesses (t ) equal to or greater than 0.120 in. [3.05 mm]. For lighter specified wall thicknesses, the minimum elongation values shall be calculated by the formula: percent elongation in 2 in. [50 mm] = 56t + 17.5, rounded to the nearest percent. For A500M use the following formula: 2.2t + 17.5, rounded to the nearest percent.

Note B: Applies to specified wall thicknesses (t ) equal to or greater than 0.180 in. [4.57 mm]. For lighter specified wall thicknesses, the minimum elongation values shall be calculated by the formula: percent elongation in 2 in. [50 mm] = 61t + 12, rounded to the nearest percent. For A500M use the following formula: 2.4t + 12, rounded to the nearest percent.

Note C: Applies to specified wall thicknesses (t ) equal to or greater than 0.120 in. [3.05 mm]. For lighter specified wall thicknesses, the minimum elongation values shall be by agreement with the manufacturer.

Note D: The minimum elongation values specified apply only to tests performed prior to shipment of the tubing.