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Magnesium alloys designations are 2 letters representing the alloy elements, and 2 numbers indicating composition percent in round numbers, followed by a dash and a letter and a number indicating the temper.
 
Designation
Alloying Elements
 
A Aluminum
E Rare Earths
H Thorium
K Zirconium
M Manganese
Q Silver
S Silicon
T Tin
Z Zinc
 
Temper Designation:
 
F Fabricated
O Annealed
H10, H11 Strain hardened
H23, H24, H26 Strain hardened and annealed
T4 Solution heat treated
T5 Artificially aged
T6 Solution heat treated and artificially aged
T8 Solution heat treated, cold worked, and artificially aged
Glossary