Abstract: With  application  of  a  50tEAF  steelmaking  terminal  process  control(TPC)at  Special  Steel  Plant,Laiwu Steel, the  end  composition  and temperature  of steel  and the yield  of alloy  are  constant, and the  overoxidation  is  eliminated  or relieved to  supply qualified molten  steel for LF. With modelling operation in LF earlier, medium and later refining period, the narrow  composition  control(NCC)of molten  steel  is realized to  get the heats  frequency with  C  control  deviation ±  0.01%    being80%,Mn,Cr±0.02%  and Si±0.05% being up to 91%,for  gear steel,the heats frequency  with S≤ 0.015%,P≤0.025%   and oxygen content  ≤20×10-6   being respectively up   to 96%,97% and 95%,and   for   bearing steel    with    S≤0.005%,P≤0.020%,oxygen content≤12×10^-6 being respectively up to 95%,97% and  100%.

Key words: 50t ,  , EAF, LF, Terminal ,  , Process ,  , Control, Narrow ,  , Composition ,  , Control, Gear ,  , Steel, Bearing ,  , Steel

摘要： 莱钢特钢厂通过50 t EAF冶炼终点控制技术(TPC)的应用,稳定了电弧炉钢水终点成分和温度,减轻或消除了钢水过氧化,稳定合金回收率,为LF提供了符合要求的钢水。通过LF前期、中期和后期的模式化操作,实现钢水的窄成分控制(NCC),使C控制偏差±0.01％炉数达到80％,Mn、Cr控制偏差±0.02％和Si控制偏差±0.05％达91％;齿轮钢S≤0.015％、P≤0.025％、氧含量≤20×10^-6分别达到96％、97％和95％;轴承钢S≤0.005％、P≤0.020％、氧含量≤12×10^-6分别达到95％、97％和100％。

关键词: 50 t电弧炉, 钢包精炼炉, 冶炼终点控制, 窄成分控制, 齿轮钢, 轴承钢