Table 1-Heat or Cast Analysis for Aluminum; Similar to "Aluminum Association"1 Alloy 6061
[CHEMICAL ANALYSIS IN WEIGHT PERCENT2]
Si min/max | Fe max | Cu min/max | Mn max | Mg min/max | Cr min/max | Zn max | Ti max | Pb max | Bi max | Other | A1 | |
each max | total max | |||||||||||
0.4/0.8 | 0.7 | 0.15/0.4 | 0.15 | 0.8/1.2 | 0.04/0.35 | 0.25 | 0.15 | 0.005 | 0.005 | 0.05 | 0.15 | Bal. |
1 The "Aluminum Association" refers to "Aluminum Standards and Data 1993", published by the Aluminum Association Inc.
2 Except for "Pb" and "Bi", the chemical composition corresponds with that of Table 1 of ASTM B 221 (IBR, see § 171.7 of this subchapter) for Aluminum Association alloy 6061.
Table 2-Mechanical Property Limits
Alloy and temper | Tensile strength-PSI | Elongation-percent minimum for 2" or 4D1 size specimen | |
Ultimate-minimum | Yield-minimum | ||
6061-T6 | 38,000 | 35,000 | 214 |
1 "D" represents specimen diameters. When the cylinder wall is greater than 3/16 inch thick, a retest without reheat treatment using the 4D size specimen is authorized if the test using the 2 inch size specimen fails to meet elongation requirements.
2 When cylinder wall is not over 3/16-inch thick, 10 percent elongation is authorized when using a 24t * 6t size test specimen.
S = [P(1.3D2 + 0.4d2)] / (D2 - d2)
Where:
S = Wall stress in psi;
P = Prescribed minimum test pressure in psig (see paragraph (g) of this section);
D = Outside diameter in inches; and
d = Inside diameter in inches.
Table 3-Flattening Test Table
Cylinder wall thickness in inches | Radius in inches |
Under .150 | .500 |
.150 to .249 | .875 |
.250 to .349 | 1.500 |
.350 to .449 | 2.125 |
.450 to .549 | 2.750 |
.550 to .649 | 3.500 |
.650 to .749 | 4.125 |
49 C.F.R. §178.46