Rui Wang , Yan-ping Bao , Yi-hong Li , Tai-quan Li , Di Chen
{"title":"Effect of slag composition on steel cleanliness in interstitial-free steel","authors":"Rui Wang , Yan-ping Bao , Yi-hong Li , Tai-quan Li , Di Chen","doi":"10.1016/S1006-706X(17)30088-2","DOIUrl":null,"url":null,"abstract":"<div><p>Ladle slag affects steel cleanliness at the end of the Ruhrstahl-Hereaeus (RH) and holding process. The relationship between composition of ladle slag, total oxygen (TO) and inclusions was investigated using X-ray fluorescence (XRF), infrared absorption, and SEM + EDS methods. The results indicate that TO in steel at the end of RH increases linearly with increasing FeO content in slag. TO is lower when\n<span><math><mrow><msub><mi>ω</mi><mrow><mtext>CaO</mtext></mrow></msub><mo>/</mo><msub><mi>ω</mi><mrow><msub><mrow><mtext>Al</mtext></mrow><mtext>2</mtext></msub><mi></mi><msub><mtext>O</mtext><mn>3</mn></msub></mrow></msub><mrow><mo>(</mo><mrow><mtext>C</mtext><mo>/</mo><mtext>A</mtext></mrow><mo>)</mo></mrow><mo>=</mo><mn>1.</mn><mi></mi><mn>5</mn><mo>-</mo><mn>2.</mn><mi></mi><mn>0</mn></mrow></math></span> than that of C/A = 1.0–1.4 under an approximate content of FeO. During the holding process, irregular Al<sub>2</sub>O<sub>3</sub> inclusions are newly generated due to slag reoxidation. Additionally, Al<sub>2</sub>O<sub>3</sub>-Ti<sub><em>x</em></sub> O inclusions are newly generated in the steel when the content of FeO is higher. By combining experimental and thermodynamic calculation results, it is determined that the slag has a good melting property within the zone of C/A=1.2–1.8 and adsorption capacity of Al<sub>2</sub>O<sub>3</sub> when the content of SiO<sub>2</sub> in slag is controlled at 4%–6%. The increase in the C/A ratio and the decrease of FeO content in slag can slow down the reoxidation rate.</p></div>","PeriodicalId":64470,"journal":{"name":"Journal of Iron and Steel Research(International)","volume":null,"pages":null},"PeriodicalIF":3.1000,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-706X(17)30088-2","citationCount":"9","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Iron and Steel Research(International)","FirstCategoryId":"1087","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1006706X17300882","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 9
Abstract
Ladle slag affects steel cleanliness at the end of the Ruhrstahl-Hereaeus (RH) and holding process. The relationship between composition of ladle slag, total oxygen (TO) and inclusions was investigated using X-ray fluorescence (XRF), infrared absorption, and SEM + EDS methods. The results indicate that TO in steel at the end of RH increases linearly with increasing FeO content in slag. TO is lower when
than that of C/A = 1.0–1.4 under an approximate content of FeO. During the holding process, irregular Al2O3 inclusions are newly generated due to slag reoxidation. Additionally, Al2O3-Tix O inclusions are newly generated in the steel when the content of FeO is higher. By combining experimental and thermodynamic calculation results, it is determined that the slag has a good melting property within the zone of C/A=1.2–1.8 and adsorption capacity of Al2O3 when the content of SiO2 in slag is controlled at 4%–6%. The increase in the C/A ratio and the decrease of FeO content in slag can slow down the reoxidation rate.