HEAT TREATMENT SYMBOLS

O Very soft (fully annealed)
T Heat-treated (hardening of aging applied)
H Strain-hardened (heat treated materials can not see)
T1 Directly shaped and natural aging
T2 Annealed
T3 The solution taken, and cold-treated
T4 Solution taken, and naturally aged
T5 Directly shaped and artificial aging
T6 Solution taken, and artificially aged
T7 Whether the solution, stabilized
T8 The solution taken, and cold-deformed and artificially aged
T9 The solution taken, and artificially aged and cold-deformed
T10 Shaped, artificially aged and cold-deformed
T42 T4 and T6 mechanical properties after thermal fatigue or corrosion
T62 resistance in case of change of the thermal process.
T351 Before aging relaxing additional voltage controlled by stretching.
T651 Before aging relaxing additional voltage controlled by stretching.
T851 Before aging relaxing additional voltage controlled by stretching.
H1 Only cold deformation
H11 1/8 hard
H111 Low-level strain-hardened
H112 Uncontrolled strain hardened
H12 ¼ hard

H14 ½ hard
H16 ¾ hard
H18 Full hard
H19 Extra hardness
H2 Cold deformation + annealing
H21 1/8 hard
H22 ¼ hard
H24 ½ hard
H26 ¾ hard
H28 Full hard
H29 Extra hardness
H3 Cold deformation + stabilized
H32 ¼ hard and stable, although
H34 ½ hard and stable, although
H36 ¾ hard and stable, although
H38 Fully rigid and stable even though
H39 If extra hard and stable
H4 Cold deformation + cooking
H42 ¼ hardness
H44 ½ strength
H46 ¾ hardness
H48 Full hard
H49 Extra hardness

 
 

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