摘要
X80管线钢(基本成分/%:0.09C、0.42Si、1.85Mn、0.022P、0.005S、0.06Als)的冶金流程为KR铁水脱硫预处理-300 t顶底复吹转炉-钢包吹氩-LF-RH-250 mm×2 150 mm板坯连铸。工艺炼钢和精炼主要优化工艺为:控制转炉出钢下渣量≤4 kg/t,采用(%):55～60CaO、7～12SiO_2、25～30Al_2O_3精炼渣系,控制LF精炼渣CaO/Al_2O_3=1.7～1.9,CaO/SiO_2=4.5～6.0,(FeO+MnO)≤1.0%,吹氩站顶底吹氩预成渣,RH真空度≤66.7 Pa,RH后喂钙线0.8 kg/t。结果表明,转炉终点碳氧积由0.002 84降为0.002 44;精炼后(FeO+MnO)为0.913%,全氧含量为0.0013%。成品材夹杂物级别≤1.0。
Flow sheet for X80 pipeline steel（basic composition /%：0.09C,0.42Si,1.85Mn,0.022P,0.005S, 0.06Als） is KR metal desulphurization pretreatment-300 t top and bottom combined blowing converter-ladle argon blowing-LF -RH-250 mm×2 150 mm slab casting process.The main steelmaking and refining optimizing processes are controlling converter tapping slag amount≤4 kg/t,using（%） 55～60CaO,7～12SiO_2,25～30Al_2O_3,refining slag series to control LF refining slag CaO/Al_2O_3 = 1.7～1.9,CaO/SiO_2 =4.5～6.0 and（FeO ＋MnO）≤1.0%,pre-forming slag at ladle argon blowing station with top and bottom argon blowing,RH vacuum≤66.7 Pa and feeding 0.8 kg/t calcium wire after RH treatment.Results show that carbon-oxygen product-[C][O]at converter endpoint decreases to 0.002 44 from original 0.002 84,after refining（FeO ＋ MnO） is 0.913%,T[O]is 0.001 3%and rating of inclusions in products is 1.0.
出处
《特殊钢》
北大核心
2011年第6期40-42,共3页
Special Steel
关键词
300
t顶底复吹BOF-LF-RH
X80管线钢
预成渣
夹杂物
碳氧积
全氧含量
300 t Top and Bottom Combined blowing Converter
X80 Pipeline Steel
Pre-formation Slag
Inclusions
Carbon-Oxygen Product
Total Oxygen Content
