Structure evolution of the drawing state CP (Commercially Pure) titanium is studied under different heating temperature

the recrystallization temperature is determined. The results show that the tensile strength of rivets set materials drawing state CP Ti is higher than 720MPa. In the condition of 20min heat preservation

reply temperature of CP Ti is from 550- 600 ℃

and the recrystallization temperature is from 600-650 ℃ . And the recrystallization is completed when the temperature reaches 650℃ in which the strength of extension is 525MPa. Grains become equal shape

which size is 2-5μm.The recrystallization performance of drawing state CP Ti is affected by the heat preservation time. When there is no heat preservation

recrystallization would not fully complete on the temperature of 650℃ in the material. When the time of heat preservation is 20 min

fully recrystallization will take place successfully in the materials and its organization will be in good condition. When the heat preservation temperature reaches 1h at 650℃

material organization will become bulky and its plastic performance will degrade. There are more effect on grain size than microhardness

the grain size is small when cooling in water under heating temperature 600-650℃ .