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Aluminum

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Alloy nomenclature
x000 series numbers mean?
1000 - pure AL
2000 - copper
3000 - manganese
4000 - silicon
5000 - magnesium
6000 - magnesium/silicon
7000 - zinc
8000 - experimental
Temper Code T
additional codes
T3
solution heat treated, cold worked

most common
Artificial aging or Precipitation Heat Treatment Process?
Hardening and strengthening process similar to Solution Heat Treatment
Heat - 250- 450F
Soak - 6 - 30 hours
Quench - cool in still air
Temper Code T
additional codes
T1
cooled from hot forming aged process, extrusion
Temper Code T
additional codes
T10
artificially aged, cold worked.
Temper Code T
additional codes
T9
solution heat treated, artificially aged, cold worked
Temper Code T
additional codes
T8
solution heat treated, cold worked, artificially aged
Temper Code T
additional codes
T7
solution heat treated, stabilized
Temper Code T
additional codes
T6
solution heat treated, artificially aged
Temper Code T
additional codes
T5
artificially aged only
Temper Code T
additional codes
T4
solution heat treated
Temper Code T
additional codes
T2
annealed, cast products only
Strain Hardened or Cold Worked
Additional information in nomenclature
Hxyz
H = strain hardened
x - 1=full anneal, 2 = partial, 3=stabilized
y - 2, 4, 6, 8 1/8s % of hardness, 4/8s is 50%.
z - manufacturers code
Stabilizing
a reduced process from partial annealing
Heat - 350F
Soak - < 1 hours
Quench - still air
Annealing Process - Partial
removes affects of previous heat treatment and cold working
Heat - 640-670F
Soak - < 2 hours
Quench - rate of 50F/hour to 450F then in still air
Annealing Process - FULL
removes affects of previous heat treatment
Heat - 750 - 800F
Soak - >2 hours
Quench - rate of 50F/hour to 500F then in still air
Temper Code T
Heat Treated and Fully Aged
Temper Code O
Annealed
Temper Code W
Unstable/ Artificially aged. Transient stage between Solution Heat Treated and aging.
Temper Code H
Strained Hardened or cold worked
Temper Codes F
As Fabricated
Natural Aging Times to Hardness
90% hardness in 24 hours
balance in 4-5 days
Solution Heat Treatment Process?
Heat - 825F to 980F
Soak - 10 to 120 minutes
Rapid Quench - Cold water for sheets, tubing, small forgings, extrusions.(provides corrosion resistance) Hot water for large forgings and items. (Minimizes distorion, prevents cracking).
Spray Quenching - clad sheets, large sections (mins distortion, prevents cracks helps with corrosion prevention)
Heat Treatment
Two stage process?
Stage 1 = Heat - Soak - Quench
Stage 2 = age or (precipitation hardening) = artificially age
4 Digit identification system
ABCD
A = alloy
B = Experiment Modification #
CD = Experiment Number
Forms of Aluminum Products
CAST = accurate to .001 thou.

WROUGHT = rolled or worked after casting
Aluminum Advantages
1/3 weight of steel
Corrosion resistance
easy to work
Good electrical conductor
Good natural finish
high heat and reflectivity
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