Theoretical calculation of Ostwald ripening regularity of Ti (C

N) in 0. 2% C

0. 004% ~ 0. 008% N

0. 02% 〜0. 05% Ti microalloying steel at 850 ~ 1 400℃ has been carried out. Results show that at below 1 000 °C

the coefficient of coarsening velocity- m of Ti (C

N) is less than 1 nm/s

1/3

at 1 400 °C that is 4 ~ 5 nm/s

1/3

with definite N content in steel and at definite temperature the coarsening velocity of Ti (C

N) increases with increasing Ti content

therefore with decreasing Ti content in steel is remarkably available for Ostwald-ripening of Ti (C

N)

With definite Ti content in steel

at definite temperature the coarsening velocity of Ti (C

N) obviously decreases with increasing N content in steel

it shows that coarsening of Ti (C

N) particles in electric furnace steel are more difficult than that in converter steel.