连铸保护渣渣膜矿相结构对不同钢种板坯冶金质量的影响

特殊钢 ›› 2016, Vol. 37 ›› Issue (1): 64-67.

连铸保护渣渣膜矿相结构对不同钢种板坯冶金质量的影响

韩秀丽¹，张玓¹，刘磊¹，邓美乐²^，刘耀辉³，陈军利³

华北理工大学1矿业工程学院; 2冶金与能源学院，唐山063009；
3邯郸钢铁有限责任公司，邯郸056015

收稿日期:2015-08-22 出版日期:2016-02-01 发布日期:2022-08-25
作者简介:韩秀丽(1966-)，女，硕士(北京科技大学)，教授，河北地质学院(本科)毕业，工艺矿物学研究。

Effect of Mineral Constitution of Casting Mold Powder Flux Films on Metallurgical Quality of Different Steels Slab

Han Xiuli¹, Zhang Di¹ , Liu Lei¹ , Deng Meile², Liu Yaohui³, Chen Junli³

1 Mining Engineering College;2 Metallurgy and Energy college,
North China University of Science and Technology, Tangshan 063009； 3 Handan Iron and Steel Co Ltd, Handan 056015

Received:2015-08-22 Published:2016-02-01 Online:2022-08-25

摘要/Abstract

摘要： 使用偏光显微镜,系统对比分析了邯郸钢厂超低碳钢SPHC(0.020%~0.055%C,70 mm板坯保护渣/%:33.14SiO₂,3.86Al₂O₃,3.88MgO,31.52CaO,8.27K₂O+Na₂O,7.55F^-1,3.93C)、包晶钢SS400(0.18%~0.22%C,70 mm板坯保护渣/%:29.62SiO₂,4.63Al₂O₃,2.05MgO,35.86CaO,10.43 K₂O+Na₂O,7.55F^-1,3.93C)和Ti微合金钢Q345B(0.15%~0.19C,0.04%~0.05%Ti,260 mm板坯保护渣/%:31.10SiO₂,5.21Al₂O₃,5.07MgO,35.46CaO,6.22K₂O+Na₂O,6.96F^-1,6.96C)对应的渣膜的矿相组成、结晶率和显微结构。结果表明,3种渣膜从铸坯至结晶器侧均呈现"结晶层-玻璃层"交替结构。SPHC钢渣膜有90%~95%的玻璃相,结晶相仅出现少量枪晶石,低结晶率有利于其润滑铸坯;SS400钢渣膜结晶率为55%~60%,析出较多的枪晶石和部分黄长石,有利于控制铸坯传热;Ti微合金钢Q345B渣膜结晶率略高于SS400钢,析出的黄长石、枪晶石和硅灰石能同时满足连铸对其润滑和控制传热的需求,可得到良好的铸坯质量。

关键词: SPHC, SS400, , Ti微合金钢Q345B, 连铸保护渣, 渣膜, 矿相结构, 邯钢

Abstract: The mineral constitution, crystallizing ratio of phase and microstructure of mold flux films for casting ultralow carbon steel SPHC (0. 020% 〜0.055% C, 70mm slab, mold powder /% ： 33. 14SiO₂, 3. 86Al₂O₃, 3. 88MgO, 31. 52CaO, 8. 27K₂O + Na₂O, 7. 55F^-1, 3. 93C), peritectic steel SS400 (0. 18% ~0. 22% C, 70mm slab, mold powder /% : 29. 62SiO₂,4. 63Al₂O₃,2. 05MgO, 35, 86CaO, 10.43K2O + Na₂O, 7.55F^-1 3. 93C) and Ti microalloying steel Q345B (0. 15% ~0. 19%C, 0. 04% ~0. 05%Ti, 260 mm slab, mold powder /% : 31. 10Si02, 5. 21Al₂O₃, 5. 07MgO, 35,46CaO, 6. 22K₂O + Na₂0, 6. 96F^-1 , 6.96C) at Handan Steel have been systematically analyzed and compared by polarizing microscope. Results show that the alternative structure of “ crystallizing layer-amorphous layer” all occurs in three kinds of flux films from slab side to mold side. In SPHC steel flux film there is 90% ~95% amorphous phase, only minor cuspidine occurs in crystallizing phase, low crystallizing ratio is favourable to lubricate casting slab; in SS400 steel flux film the crystallizing ratio is about 55% - 60% , more cuspidine with partial melilite precipitates that is available to control slab heat transfer； the crystallizing ratio in Ti micro-alloy steel Q345B flux film is little higher than that in SS400 flux film, the precipitated melilite, cuspidine and wollastonite that meet the requirement of lubrication and heat transfer control, and are available to get nice slab quality.

韩秀丽, 张玓, 刘磊, 邓美乐, 刘耀辉, 陈军利. 连铸保护渣渣膜矿相结构对不同钢种板坯冶金质量的影响[J]. 特殊钢, 2016, 37(1): 64-67.

Han Xiuli, Zhang Di , Liu Lei , Deng Meile, Liu Yaohui, Chen Junli. Effect of Mineral Constitution of Casting Mold Powder Flux Films on Metallurgical Quality of Different Steels Slab[J]. Special Steel, 2016, 37(1): 64-67.

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