Abstract: The   low   carbon   low   silicon   aluminum   killed   steel   ML08Al(%:≤0.08C,0.20～0.50Mn,≤0.06Si,  0.02Al)was produced by 83 t top-bottom combined blown converter - 83 t ladle furnace - 6 strand 150 mmx 150 mm billet concaster process at Baotou Steel. The operation practice showed that the aluminum content in steel was regularly 0.02%~ 0.09% by 43Al- 13Mn-2Ti alloy deoxidation during tapping of converter instead of Al brick; the nozle clogging was avoided as sulphur content in steel was less than 0.01% to decrease amount of CaS formed in molten steel; and the resilicon amount decreased by decrease down slag amount and adding 400 kg lime in tapping of converter,and regulate deoxidation reagent adding amount and time to ensure silicon content in steel no more than 0.06%,

Key words: 150 mm×150 mm Billet, Steel ML08Al, Concasting, Process Practice

摘要： 包钢采用83 t转炉,83 t钢包炉(LF),6机6流150 mm×150 mm方坯连铸机生产低碳低硅铝镇静钢ML08Al(%:≤0.08C,0.20~0.50Mn,≤0.06Si,0.02Al)。生产实践表明,转炉出钢时用43%Al、13%Mn、2%Ti的铝锰钛合金替代铝锭进行脱氧,可使钢中铝含量稳定在0.02%~0.09%;将钢中的硫含量降至0.01%以下时,可减少钢液中CaS的产生,基本消除中间包水口堵塞;转炉出钢过程减少下渣量,并加入400 kg石灰,调整LF精炼过程脱氧剂加入量和加入时间,以减少回硅量,使钢中硅含量≤0.06%。

关键词: 150 mm×150mm方坯, ML08Al钢, 连铸, 工艺实践