集装箱板用耐候钢生产过程中非金属夹杂物研究论文.pdfVIP

集装箱板用耐候钢生产过程中非金属夹杂物研究 田伟1 李晶1 余健1 齐达1 魏丽艳1 钟志永2 张金星2 1.北京科技大学冶金与生态工程学院，北京 100083 2.珠江钢铁股份有限公司，广州510000 摘 要：本文主要研究了 “EAF—LF—CSP”工艺生产集装箱板用耐候钢的全过程，特别关注了冶炼过程中非金属 夹杂物的演变规律。对冶炼过程全程取钢样和渣样，分析了钢样和渣样的化学成分；并对过程钢样进行大样电解， 采用SEM-EDS系统地分析了钢样中非金属夹杂物的形貌和成分。实验结果表明：本试验工艺路线下，SPA-H钢铸 坯中T[O]能够控制在0.001％ ～0.0015％，在钢纯净度控制方面达到了超低氧的水平。冶炼过程中总氧和氮含量 变化趋势类似，均保持相对稳定。在LF精炼前期夹杂物主要为钙铝酸盐及少量氧化物，随着精炼的进行，氧含量进 一步降低，夹杂物中出现硫化物，这些硫化物与钙铝酸盐夹杂物结合形成双相夹杂物，尺寸较大，形状近似球形。 关键词：耐候钢；LF精炼；非金属夹杂物 StudyonNon-metallicInclusionsofWeatheringSteelforContainerSheet TianWei1 LiJing1 YuJian1 QiDa1 WeiLiyan1 ZhongZhiyong2 ZhangJinxing2 1.SchoolofMetallurgicalandEcologicalEngineering,UniversityofScienceandTechnology Beijing,Beijing100083;2.GuangzhouZhujiangSteelCo.,Ltd.,Guangzhou510000 Abstract:TheEAF-LF-CSPproducingprocessofweatheringsteelforcontainersheetwasstudiedsystematicallyinthis paper,especiallytheformationprincipleofnon-metallicinclusions.Steelandslagsamplesweretakenfromeverystageof producingprocess,whosechemicalcompositionwasanalyzed.BymeansoflargesampleelectrolysisandSEM-EDS,the morphologyandcompositionofnon-metallicinclusionsinsteelsamplewereanalyzedsystematically.Theresultsshowedthat totaloxygencontentinslabcouldbecontrolledaround0.001％ ～ 0.0015％ andpurenessofsteelreachedthelevelofultra lowoxygencontent.Thevariationtrendoftotaloxygencontentandphosphoruscontentwhichwasrelativestabilitywas analogous.Mostinclusionswerecalcium-aluminatesinclusionsandseveralwereoxideinclusionsinfirst-phaseofLFrefining process.AlongwithLFrefiningprocess,oxygencontentfelldownandsulphideappeared.Sulphideandcalcium-aluminates inclusionsformeddual-phaseinclusionswhichwerelargeandapproximatelysphere. Keywords:weatheringsteel;LFrefining;non-metallicinclusion 洋电解。对 (SEM)讲 骂铝酸盐夹杂物的 andelementofcal ■ 嘲 声利活度系数 ~cientofde C (1873K) 当 钢 液 中 EA 。4时脱氧产物蔓 1-4％时钢液中薹 ％时铜漓由垒翻