ASTM A500
ASTM A500 is a standard specification for cold-formed welded seamless carbon steel structural tubing (round, square, and rectangular) published by ASTM. It is commonly used in the United States for hollow structural sections, but Canada prefers the more stringent CSA G40.21. Another related standard is ASTM A501, which is the hot-formed version of this A500. ASTM A500 defines four grades of carbon steel based primarily on material strength.
This is a standard developed by the standards organization ASTM International, a voluntary standards development organization that develops technical standards for materials, products, systems, and services.
| 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 |
| 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 | ||
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