鈣處理對鋁鎮靜鋼中非金屬夾雜物變性效果的影響

趙東偉; 包燕平; 王敏; 馬文俊; 蘇利川

doi:10.13374/j.issn1001-053x.2013.09.005

鈣處理對鋁鎮靜鋼中非金屬夾雜物變性效果的影響

doi: 10.13374/j.issn1001-053x.2013.09.005

1. 北京科技大學冶金與生態工程學院, 北京 100083;
2. 杭州鋼鐵集團公司技術中心, 杭州 310022

基金項目:

國家自然科學基金資助項目(51074019)

詳細信息

通訊作者:
包燕平,E-mail:baoyp@ustb.edu.cn

中圖分類號: TF704.7
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出版歷程
- 收稿日期: 2012-07-07

Effectiveness of calcium treatment on nonmetallic inclusions in Al-killed steel

1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Technology Center, Hangzhou Iron and Steel Group Company, Hangzhou 310022, China

摘要

摘要: 通過對LF前-LF后-中間包-連鑄工藝生產40Cr鋼各環節系統取樣,以及電子顯微鏡對夾雜物的形貌、尺寸及組成的分析,發現40Cr鑄坯中含有大量CaO(CaS)-Al₂O₃-MgO類復合夾雜.采用Factsage計算得到的CaO-CaS-Al₂O₃三元相圖對鈣處理后CaO(CaS)-Al₂O₃夾雜形成過程進行了理論計算;并對實際發現的CaO(CaS)-Al₂O₃-MgO類復合夾雜物的面掃描分布進行描邊處理,探討了該類夾雜物的組成和形成過程.經Factsage理論計算發現,CaO-CaS-Al₂O₃三元相圖中液相區各成分質量分數為CaO 32%~58%、CaS 0%~5%以及Al₂O₃42%~65%,鈣處理后CaO含量有逐漸增加,CaS含量有逐漸減小趨勢.結合夾雜物的面掃描分布發現,CaO(CaS)-Al₂O₃-MgO類復合夾雜物的組成為xCaO·yAl₂O₃+mMgO·nAl₂O₃+Al₂O₃+CaS,鈣處理后Ca能夠使Al₂O₃變性為CaO-Al₂O₃,但同時夾雜物中也有很高的CaS成分,隨著鈣處理的充分進行,CaS將由內及外向CaO-Al₂O₃逐漸轉變.
- 煉鋼 /
- 鈣處理 /
- 夾雜物 /
- 改性
Abstract: Massive CaO(CaS)-Al₂O₃-MgO complex inclusions were found in 40Cr casting billet samples based on systematic sampling during the processes of before LF-after LF-tundish-continuous casting and electron microscopy analysis on inclusion morphology, size and composition. The formation of CaO(CaS)-Al₂O₃ complex inclusions was the-oretically calculated in the CaO-CaS-Al₂O₃ ternary phase diagram obtained by Factsage; the composition and formation process of CaO(CaS)-Al₂O₃-MgO complex inclusions were studied by further stroke treatment on surface scan distribu-tion. Factsage calculations show that the contents of components in the liquid region of the CaO-CaS-Al₂O₃ ternary phase diagram are 32% to 58% CaO, 0% to 5% CaS, and 42% to 65% Al₂O₃. The CaO content increases and the CaS content decreases gradually after calcium treatment. In combination with the scanning plane distribution of inclusions, it is found that the CaO(CaS)-Al₂O₃-MgO complex inclusions are xCaO·yAl₂O₃+mMgO·nAl₂O₃+Al₂O₃+CaS. Moreover, Ca can make Al₂O₃ become CaO-Al₂O₃ while the inclusions have very high CaS content after calcium treatment. Along with calcium treatment carrying on, CaS will gradually transform into CaO-Al₂O₃ from the inner to the outward.
- steelmaking /
- calcium treatment /
- inclusions /
- modification