| CHEMICAL COMPOSITION |
Designation：LD30（6061） |
|
Si
|
Fe
|
Cu
|
Mn
|
Mg
|
Cr
|
Zn
|
Ti
|
Others
|
Al
|
|
Single
|
Total
|
|
0.4-0.8
|
0.7
|
0.15-0.40
|
0.15
|
0.8-1.2
|
0.04-0.35
|
0.25
|
0.15
|
0.05
|
0.15
|
Surplus
|
|
| CHENICAL COMPOSITION |
Designation：LD31（6063） |
|
Si
|
Fe
|
Cu
|
Mn
|
Mg
|
Cr
|
Zn
|
Ti
|
Others
|
Al
|
|
Single
|
Total
|
|
0.2-0.6
|
0.35
|
0.10
|
0.1
|
0.45-0.90
|
0.1
|
0.1
|
0.1
|
0.05
|
0.15
|
Surplus
|
|
| MECHANICAL PROPERTY |
|
|
Alloy designations
|
Condition
|
Tensile strength
|
Yield strength
|
Elongation rate
|
Vickers hardness
|
|
LD30(6061)
|
CS(T6)
|
≥265N/mm²
|
≥245N/mm²
|
≥8%
|
|
|
LD31(6063)
|
RCS(T5)
|
≥160N/mm²
|
≥110N/mm²
|
≥8%
|
HV≥58
|
|
CS(T6)
|
≥205N/mm²
|
≥180N/mm²
|
≥8%
|
|
|
| Thickness
of oxide film: above 10um, above 15um when use in glass
curtain wall |
|
| HOLE SEALING QUALITY OF
OXIDE FILM |
|
|
Testing method
|
P-Cr acid-etching weigh loss method
|
After-acid-dipping weith loss method
|
|
Acceptable
|
≤30mg/dm²
|
≤20mg/dm²
|
|
| QUALITY OF ELECTROPHORETIC PAINTING.
|
Hardness of pain film：≥3H
Thickness of pain film： |
|
Grade
|
Anodic oxide film |
Pain film
|
Complex film
|
|
Average thickness
of film
|
Local thickness
|
|
A
|
≥10
|
≥8
|
≥12
|
≥21
|
|
B
|
≥10
|
≥8
|
≥7
|
≥17
|
|
