Temper designation of copper alloys

Temper designation of copper alloys was developed by the American Society for Testing and Materials (ASTM).
The designation system uses codes, consisting of a letter, indicating general temper, and additional numbers and letters, specifying the temper parameters:

• O – annealed;

O10…O82 – various degrees of annealing;
OS005…OS200 – annealed to a specific grain size;
M - as manufactured;
M01…M45 – manufactured by a specific method;

• H – cold worked;

H00…H14 – various degrees of cold work (hardness);
H50…H86 – cold work in specific process;
HR01…HR50 – cold work followed by stress relief;
HT04…HT08 – cold work followed by strengthening heat treatment;

• T - heat treatment followed by rapid cooling;

TB00 – solution treatment;
TD00…TD04 – solution treatment followed by cold work;
TF00 – solution treatment followed by precipitation hardening;
TL00…TL04 – precipitation hardening followed by cold work;
TR00…TR04 – precipitation hardening followed by cold work and stress relief;
TH00…TH04 – solution treatment followed by cold work and precipitation hardening;
TM00…TM008 – combination of cold work by rolling and precipitation hardening;
TQ00…TQ75 – hardening by quenching;

• TX – spinodal heat treatment;

TS – solution treatment followed by cold work and spinodal heat treatment;

• W – welded;

WM00…WM50 – as welded;
WO – welded and annealed;
WH00...WH01 – welded and cold worked;
WR00…WR01 – welded, cold worked and stress relieved.