Abstract: The variation of dissolved oxygen content in molten steel-[O] and inclusion ingredient of SWRM6 cold heading steel(≤0.08C,≤0.06Si,≥0.02Al) deoxidized refining by 2.5 kg/t Al block + 2.5 kg/t compound deoxidants or 5.0 kg/t AlMgFe block has been studied by 1kg MoSi₂ furnace. The results showed that at 1873 ℃ with dissolved oxygen content 600×10^-6~850×10^-6 in steel and deoxidized by Al for 30 min,the[O] was 6×10^-6~17×10^-6,and then feeding compound deoxidants to deoxidize for 30 min,the [O] in steel could decreased to 3×10^-6~ 4×10^-6 by feeding FeSiMgBaCaAl,FeMgCaAl,or FeCa wire,except for heats by feeding FeCaAl for 30 min,of which the [O] in steel was 13×10^-6.Alone deoxidized by 70%～80% Al-10%～15% Mg-Fe& alloy for 30 min,the [O] in steel decreased to 4×10^-6 .The analysis on typical inclusion in steel showed that the formed larger size inclusions in steel deoxidized by alloy AlMgFe easily went up and were removed from molten steel.

Key words: Cold Heading Steel, Compound Deoxidant, Dissolved Oxygen, Inclusion

摘要： 用1kg MoSi₂炉实验研究了成分(%)为≤0.08C,≤0.06Si,≥0.02Al的SWRM6冷镦钢用2.5kg/t Al块+2.5kg/t 复合脱氧剂包芯线或5.0kg/t AlMgFe块脱氧后钢中溶解氧含量-[O]和夹杂物成分的变化。结果表明,在1873℃钢中初始溶解氧为600×10^-6~850×10^-6时,Al脱氧30min后,[O]为6×10^-6~17×10^-6,再经喂复合脱氧剂包芯线30min后,除喂FeCaAl线的炉次[O]较高为13×10^-6,喂FeSiMgBaCaAl、FeMg-CaAl、FeCa线炉次的[O]均达到3×10^-6~4×10^-6。单用70%~80%Al-10%~15%Mg-Fe合金脱氧30min后的炉次的[O]即达到4×10^-6。典型夹杂物分析表明,用AlMgFe合金脱氧产生较大颗粒夹杂物,易上浮排除。

关键词: 冷镦钢, 复合脱氧剂, 溶解氧, 夹杂物