5. Methods for indicating the second and third level states of heat treatment state (T):
1). Second level state code of heat treatment state (T):
TQ - quenching hardening; TB - solution heat treatment; TF - solution heat treatment + precipitation heat treatment; TX - solution heat treatment + metastable decomposition heat treatment; TD - solution heat treatment + cold working; TH - solution heat treatment + cold working + precipitation heat treatment; TS - cold working + metastable decomposition heat treatment; TL - precipitation heat treatment or metastable decomposition heat treatment + cold working; TR - precipitation heat treatment or metastable decomposition heat treatment + cold working + stress relief; TM - processing residual heat quenching hardening
2). Third level state code of heat treatment state (T):
Add two Arabic numerals after the second level state code, as shown below:
TQ: TQ00 - quenching hardening; TQ30 - quenching hardening + annealing; TQ50 - quenching hardening + quenching and tempering annealing; TQ55 - quenching hardening + quenching and tempering annealing + Cold drawing + stress relief; TQ75 - intermediate quenching
TB: TB00 - solution heat treatment
TF: TF00 - solution heat treatment + precipitation heat treatment; TF01 - precipitation heat treatment plate - low hardening; TF02 - precipitation heat treatment plate - high hardening
TX: TX00 - precipitation heat treatment plate - high hardening
The two-digit Arabic numeral added after the secondary state code TD, TH, TS, TL, TR, TM indicates the degree of cold work hardening, 00 means 1/8 hard; 01 means 1/4 hard; 02 means 1/2 hard; 04 means hard; 06 means extra hard; 08 means elastic; 10 means high elastic; 12 means special elastic; 13 means higher elastic; 14 means ultra-high elastic. Examples of the two-digit numbers, three-level state codes and names added to these secondary state codes are as follows:
The two-digit Arabic numerals added after TD are 00, 01, 02, 03, 04, 08, and the three-level state codes and names are, such as TD00 - solution heat treatment + cold working (1/8 hard); TD08 - solution heat treatment + cold working (elasticity)
The two-digit Arabic numerals added after TH are 00, 01, 02, 03, 04, 08, and the three-level state codes and names are, such as TH03 - solution heat treatment + cold working (3/4 hard) + precipitation heat treatment
The two-digit Arabic numerals added after TS are 00, 01, 02, 03, 04, 06, 08, 10, 12, 13, 14, and the three-level state codes and names are, such as TS14 - cold working (ultra-high elasticity) + Metastable decomposition hardening
Add two Arabic numerals after TL, which are 00, 01, 02, 04, 08, 10, and the three-level state code and name, such as TL10 - precipitation heat treatment or metastable decomposition heat treatment + cold working (high elasticity)
Add two Arabic numerals after TR, which are 01, 02, 04, and the three-level state code and name, such as TR01 - precipitation heat treatment or metastable decomposition heat treatment + cold working (1/4 hard) + stress relief
Add two Arabic numerals after TM, which are 00, 01, 02, 03, 04, 06, 08, and the three-level state code and name, such as TM02 - processing residual heat quenching + cold working (1/2 hard)
