ASTM A500

ASTM A500 is a standard specification published by the ASTM for cold-formed welded and seamless carbon steel structural tubing in round, square, and rectangular shapes. It is the most commonly specified ASTM standard in the US for hollow structural sections. Another related standard is ASTM A501, which is a hot-formed version of this A500. Other HSS ASTM Standards include ASTM A1065, ASTM A1085 and ASTM A847. CSA G40.21 is the preferred HSS standard in Canada.

ASTM A500 defines four grades of carbon steel based primarily on material strength.[1] This is a standard set by the standards organization ASTM International, a voluntary standards development organization that sets technical standards for materials, products, systems, and services.

Density

Like other carbon steels, A500 and A501 steels have a specific gravity of approximately 7.85, and therefore a density of approximately 7850 kg/m3 (0.284 pounds per cubic inch).[2]

Grades

A500 cold-formed tubing comes in four grades based on chemical composition, tensile strength, and heat treatment. The most commonly specified and utilized is Grade C. The minimum copper content is optional. Grade D must be heat treated.[1]

Grade UNS Composition (% by weight in heat) Minimum strength requirements
C Mn P S Cu tensile yield (round) yield (shaped) elongation
max % max % max % max % min % MPa (ksi) MPa (ksi) MPa (ksi) %
A K03000 0.26 1.35 0.035 0.035 0.20 310 (45) 230 (33) 270 (39) 25
B K03000 0.26 1.35 0.035 0.035 0.20 400 (58) 290 (42) 315 (46) 23
C K02705 0.23 1.35 0.035 0.035 0.20 425 (62) 315 (46) 345 (50) 21
D K03000 0.26 1.35 0.035 0.035 0.20 400 (58) 250 (36) 250 (36) 23

Mechanical Properties

Shaped structural tubing

Grade Physical Properties Mechanical Properties
Density Tensile Strength, Ultimate Tensile Strength, Yield
gram/ cubic cm lb/cubic in MPa psi MPa psi
A 7.80 0.282 310 45000 270 39000
B .305 400 58000 315 46000
C 425 62000 345 50000
D 400 58000 250 36000

References

  1. ^ a b ASTM A500/A500M-07.
  2. ^ A500A steel material properties Archived November 11, 2006, at the Wayback Machine, accessed October 8, 2006.

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