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研究了超低氧(10×10~(-6))钢20CrMoH和60Si2MnA转炉终点[C]和LF渣(TiO_2)对转炉终点[Ti]和LF精炼过程△[Ti]的影响,以及[S]、[N]对TiN生成的影响。结果表明,试验钢TiN夹杂有两类:(1)单独TiN;(2)CaS为核心的复合TiN。20CrMoH钢中TiN夹杂较少,60Si2MnA钢中TiN占夹杂总量的50%～60%。随铸坯中S含量的增加,TiN夹杂含量增加;当[Ti]为(69～80)×10~(-6),[N]、[S]分别从(60～74)×10~(-6)和(30～35)×10~(-6)降至(27～35)×10~(-6)和(14～20)×10~(-6)时,TiN个数从4.4～6.1个/cm~2降低到0.4～1.1个/cm~2;当[S]≤0.002%,钢中无CaS-TiN复合夹杂析出。
The effect of the end point [C] of converter 20CrMoH and 60Si2MnA, and the slag LF (TiO_2) of ultra-low oxygen (10 × 10 -6) steel on [Ti] and △ [Ti] ], [N] on the formation of TiN. The results show that there are two types of TiN inclusions in test steel: (1) TiN alone; (2) composite TiN with CaS as the core. TiN inclusions in 20CrMoH steel is less, TiN in 60Si2MnA steel accounts for 50% -60% of the total inclusions. With the increase of S content in the slab, the content of TiN inclusions increased. When [Ti] was (69-80) × 10 -6, [N] and [S] were from 60 to 74 × 10 ~ -6 and 30 ~ 35 × 10 -6 to 27 ~ 35 × 10 -6 and 14 ~ 20 × 10 -6, respectively, the number of TiN decreased from 4.4 ~ 6.1 / cm ~ 2 to 0.4 ~ 1.1 / cm ~ 2. When [S] ≤0.002%, there is no CaS-TiN compound inclusions in the steel.