With over a century of experience in the development of more than 1,500 Standards, UL is an accredited standards developer in the US and Canada. The yield strength requirements are higher for square and rectangular than for round tubing. UL Standards encompass ULs extensive safety research and scientific expertise. Grades Ī500 cold-formed tubing comes in four grades based on chemical composition, tensile strength, and heat treatment. Like other carbon steels, A500 and A501 steels have a specific gravity of approximately 7.85, and therefore a density of approximately 7850 kg/m 3 (0.284 pounds per cubic inch).
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