Cast aluminium alloys | Wallid Guergour

Metallurgy

03/01/2022


The designation of cast aluminium alloys can be done in two forms.


The numerical designation according to NF EN 1706; that of cast alloys is identical to that of wrought alloys.
Five digits instead of four specify the chemical composition.

The conventional designation according to NF A 57 702 for casting alloys; this is of the alphanumeric type according to NF A 02-004.
The method of production and the metallurgical state are designated by the letter Y followed by two digits in accordance with standard NF A 02-002.
This type of designation is still partially used.

Aluminium alloys for casting


ABCDEFGHIJ
1
Group of aluminium alloysDesignationStateProprieties and uses
2
NF EN 1706NF A 57-702
3
Aluminium + CopperEN AB-20180 [Al Cui8MgTi]A-U8SY23, Y33, Y24, Y34Good machinability (mechanical parts, high mechanical properties).
4
5
Aluminium + ManganeseEN AB-30040[Al Mn1Mg]A-M1GY10Hardening by work hardening
Ingots for rolled products
6
7
Aluminium + SiliconEN AB-42200[Al Si7Mg]A-S7G06Y20 Y30High mechanical properties at room temperature and hot.
8
9
Aluminium + MagnesiumEN AB-51000[Al Mg3Ti]A-G3TY23 Y30
Excellent corrosion resistance
10
11
Aluminium + Magnesium + SiliconEN AB-60000[Al Mg1Si]A-G3Si1Y20 Y30Welds well. Good corrosion resistance (car components...)
12
13
Aluminium + ZincEN AB-71000[Al Zn5Mg]A-Z5GY25 Y29Good corrosion resistance, welds well.
14
15
Cast products NF A 02-002Delivery states
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Designation: Letter followed by two digits, the first specifies the production method, the second indicates the heat treatment. For example: A-U5GT Y23
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18
SymbolProduction methodSymbolDelivery state
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Y0Not defined0No treatment, or treatment not specified
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Y1Ingot1Annealed
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Y2Sand casting2Quenched
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Y3Chill casting3Quenched and tempered
23
Y4Die casting4-
24
Y5Concretion5Stabilized
25
Y6-6Soaked and stabilized
26
Y7By continuous casting7-
27
Y8By centrifugation8-
28
Y9As prescibed9As prescribed
29
Processing symbolsBasic metallurgical state
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F - Unprocessed0 - AnnealedH - HardenedT - Heat Treated
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Subdivisions of the H-state
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ConditionHardenedHardened and temperedHardened and stabilised
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1/4 durH 12H 22H 32
34
1/2 durH 14H 24H 34
35
3/4 durH 16H 26H 36
36
4/4 durH 18H 28H 38
37
Extra-durH 19H 29H 39
38
Subdivisions of the T-state
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Aluminium et alliages d'aluminiumCuivre et alliages de cuivre - nickel et alliages de nickel
40
T3 Solution* cold worked and wroughtT6 Solution and temperedTA Controlled coolingTC TA and cold forming
41
42
T4 Solution et mûriT8 Solution, hardened and tempered
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TB Solution and quenchTD TB and cold worked
44
T5 Refroidi et revenuT10 Cooled, tempered and hardened
45