Production practice indicated that the amount(rating)of α-phase in 1Cr18Ni9Ti austenite stainless steel was principal factor to influence bloom surface quality of 2.625 t ingot
and as α-phase rating was more that 2.5 corresponding to α-phase content(area)= 12%
the surface quality of bloom rapidly decreased. As C% in steel was 0.08% (Cr+3.28Ti)/Ni≤2
and ingot pit temperature ≤1270 ℃
the rating of α-phase in steel was ≤2.5 to get excellent sur- face quality of bloom. For obtained nice surface quality of bloom it should be to control Ti content in steel ≤0.70%