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Aluminum Tempers(铝的脾气)
Aluminum Tempers
Aluminum is a lightweight structural material that can be strengthened through alloying and, depending
upon composition, further strengthened by heat treatment and/or cold working. Among its advantages
for specific applications are:
Low density, high strength-to-weight ratio, good corrosion resistance, ease of fabrication and diversity
of form.
Wrought and cast alloys are identified by a four-digit number, the first digit of which generally identifies
the major alloying element as shown in the table below. For casting alloys, the fourth digit is separated
from the first three digits by a decimal point and indicates the form i.e., cast or ingot.
Number Element
IXXX 997. Mn. Aluminum
IXX.X 997. Mm. Aluminum
2XXX Copper
2XX.X Copper
3XXX Manganese 3SS.S Silicon with added copper and/or magnesium
4XXX Silicon
4XX.X Silicon
5XXX Magnesium
5XX.X Magnesium
6XXX Magnesium and Silicon
7XXX Zinc
7XX.X Zinc
8XXX Other Elements
8XX.X Tin
9XXX Unused Series
9XX.X Other Elements
Basic Aluminum Temper
Designations
The temper designation appears as a hyphenated suffix to the basic alloy number. An example would be
7075-T73 where T73 is the temper designation. Four basic temper designations are used for aluminum
alloys. They are –F: as fabricated; -O: annealed; -H: strain hardened and –T: thermally treated. A fifth
designation, -W, is used to describe an as –quenched condition between solution heat treatment and
artificial or room temperature aging. Following is a list of tempers which define aluminum alloys.
-H1II: Applies to products which are strain hardened less than the amount required for a controlled HII
temper.
-H212: Applies to products which acquire some temper from shaping processes not having special
control ov
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