Properties of High Basicity Mold Fluxes for Peritectic Steel Slab Casting

钢铁研究学报(英文版), 2012, 19(7): 39-45.

Properties of High Basicity Mold Fluxes for Peritectic Steel Slab Casting

^1, , ^2, , ^3, , ^4, , ^5,

1.Chongqing Key Laboratory of Metallurgical Engineering, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

2.Chongqing Key Laboratory of Metallurgical Engineering, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

3.Chongqing Key Laboratory of Metallurgical Engineering, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

4.Chongqing Key Laboratory of Metallurgical Engineering, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

5.Chongqing Key Laboratory of Metallurgical Engineering, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

基金项目: Item Sponsored by National Natural Science Foundation of China (50904083)

关键词：保护渣性能 , 板坯连铸 , 高碱度 , 包晶钢 , 结晶器保护渣 , 高速连铸 , 缺陷产品 , 铸造过程

Properties of High Basicity Mold Fluxes for Peritectic Steel Slab Casting

LONG Xiao ^1, , HE Sheng-ping ^2, , XU Jian-fei ^3, , HUO Xu-ling ^4, , WANG Qian ^5,

1.Chongqing Key Laboratory of Metallurgical Engineering, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

2.Chongqing Key Laboratory of Metallurgical Engineering, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

3.Chongqing Key Laboratory of Metallurgical Engineering, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

4.Chongqing Key Laboratory of Metallurgical Engineering, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

5.Chongqing Key Laboratory of Metallurgical Engineering, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

Keywords： mold flux high basicity , crystallization property , peritectic steel ,

In high speed continuous casting of peritectic steel slabs, mold fluxes with high basicity are required for less surface defect product. However, the basicity of remaining liquid slag film tends to decrease in casting process because of the crystallization of 3CaO ·2SiO2 · CaF2. Thus, a way is put forward to improve mold fluxesr properties by raising the original basicity. In order to confirm the possibility of this method, the effect of rising original basicity on the properties of mold fluxes is discussed. Properties of high fluorine based mold fluxes with different basicities and contents of CaF2 , Na2 O, and MgO were measured, respectively. Then, properties of higher basicity mold fluxes were discussed and compared with traditional ones. The results show that increasing the basicity index can improve the melting and flow property of mold fluxes. With the increasing basicity, crystallization rate of mold fluxes increases obviously and crystallization temperature tends to decrease when the basicity exceeds 1.35. The method presen- ted before is proved as a potential way to resolve the contradiction between horizontal heat transfer controlling and solidified shell lubricating for peritectic steel slab casting. But further study on improving the flow property of liquid slag is needed. This work can be used to guide mold fluxes design for high speed continuous casting of peritectic steel slabs.

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Properties of High Basicity Mold Fluxes for Peritectic Steel Slab Casting

Properties of High Basicity Mold Fluxes for Peritectic Steel Slab Casting

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