By Rob Siegwart
ASTM A500-03a (2003 revision a) Standard Specification for Cold-Formed
Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes
Mechanical
Round Structural Tubing
| Property |
Grade A |
Grade B |
Grade C |
Grade D |
|---|
| Yield (psi) |
33,000 |
42,000 |
46,000 |
36,000 |
| Tensile (psi) |
45,000 |
58,000 |
62,000 |
58,000 |
| Elongation in 2 in (%) |
25 |
23 |
21 |
23 |
Shaped Structural Tubing
| |
|
|
|
|
|---|
| Yield (psi) |
39,000 |
46,000 |
50,000 |
36,000 |
| Tensile (psi) |
45,000 |
58,000 |
62,000 |
58,000 |
| Elongation in 2 in (%) |
25 |
23 |
21 |
23 |
Tolerance
Round Tubing
| Up to 1.900 OD |
+/-0.5% |
| Greater than 2.00+ OD |
+/- 0.75% |
Square and Rectangular Tubing
Permissible variations in outside flat dimensions for square and rectangular
tubing:
| Outside Large Flat (in) |
Permissible Variation |
|---|
| < 2.5 |
0.020 |
| 2.5 - 3.5 |
0.025 |
| 3.5 - 5.5 |
0.030 |
| > 5.5 |
0.01 times the flat dimension |
Chemical
All grades:
| Element |
% |
|---|
| C |
0.23 - 0.30 |
| Mn |
0.35 - 1.40 |
| P |
0.035 - 0.045 |
| S |
0.035 - 0.045 |
| Cu |
0.18 - 0.20 |