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連鑄電磁攪拌參數優化技術
詳細介紹

一、技術簡介:
連鑄電磁攪拌根據安裝位置不同主要分為結晶器(MEMS)、二冷區(SEMS)和凝固末端電磁攪拌(FEMS)三類,是應用于提高鑄坯皮下質量和內部質量問題的有效技術手段之一,已經獲得了廣泛關注和應用。其基本原理是通過磁場感應產生電磁力,改善液相穴鋼水流動狀態,影響鑄坯內部凝固傳熱、傳質過程,進而改善鑄坯凝固組織與結構,提高鑄坯質量。但是,電磁攪拌使用不當,也可能產生負面影響,如結晶器電磁攪拌作用過強,容易引起卷渣、嚴重的負偏析等不良冶金效果,產生新的產品質量問題。因此,優化確定電磁攪拌參數是充分發揮其積極冶金效果,抑制其負面影響的關鍵。電磁攪拌的參數包括電流、頻率和攪拌方式、時間等。最終的應用效果通過低倍評級、化學成分分析等檢驗手段予以確認。
該技術2006年通過南京市科技局技術鑒定,技術成果經同行專家鑒定為“國內先進水平”,2007年獲得冶金科技進步三等獎。
目前在多家鋼廠進行應用,對于提高鑄坯質量,開發新鋼種,特別是中、高碳鋼及合金鋼,起到了明顯的效果,提供了有力的支持。
二、技術特點:
(1) 基于凝固傳熱模型和射釘測坯殼厚度相結合確定末端電磁攪拌安裝位置和最佳工作拉速范圍;
(2) 采用定制的特斯拉計對磁感應強度進行全面的測量及對凝固前沿電磁力、鋼水流動速度進行計算分析,對電磁攪拌器進行綜合評價;
(3) 基于Ansys建立電磁攪拌的磁流體有限元數學模型,對其磁場和流場進行數值模擬,深入分析電磁攪拌參數對鋼水流場的影響;
(4) 依據基礎數據和電磁冶金專家經驗所建立的專家系統,對電磁攪拌的參數進行優化,并通過工業試驗、低倍檢驗等方式對冶金效果進行確認;
(5) 該技術配合二冷動態配水優化控制系統,極有利于對鑄坯凝固傳熱過程的控制,能最大程度地優化鑄坯質量。

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