Test alloy Ni30Cr20 (/% : 0.035 〜0.045C

0.28 ~0. 30Si

0. 73 〜0. 75Mn

0. 005 ~0. 007P

0. 001 ~ 0. 002S

19.40~ 19. 93Cr

29. 75 ~30.35Ni

0. 30 〜0. 36A1

0. 03 〜0. 88Ti

0.005 7 ~0

0205N) is melted by 150kg vacuum induction furnace to cast ingot with size (mm) 120 x230 x500. The calculation on thermodynamics conditions of TiN precipitation in alloy Ni30Cr20 during solidification process is carried out and the amount

size and distribution of TiN in ingot of the alloy are analyzed by optical microscope

scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). Test results show that part titanium nitride has been precipitated in liquid alloy including single TiN and TiN containing of MgO・Al

2

O

3

MgO and TiO

2

etc. nucleus. The amount of titanium nitride decreases and their size increases gradually from edge to center of ingot. Calculation results show that it is available to the amount and size of precipitated TiN by controlling the titanium-nitrogen product less than 3. 70 x 10

-4

while to decrease nitrogen content in alloy is a efficient measure to decrease the amount of precipitation and size of titanium nitride.