权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Kinetic Study on Decarburization of Molten Iron and Iron-Chromium Alloy in Ultra Low Carbon Concentration Range

超低碳浓度范围内铁水及铁铬合金脱碳动力学研究

基本信息

批准号：
02453057
负责人：
SANO Masamichi
金额：
$ 5.5万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02453057/
关键词：
Molten iron Molten Fe-Cr alloy Ultra-low carbon steel Decarburization Solid oxide Vacuum degassing Porous material Gas permeability 低炭素鋼酸化性ガス

项目摘要

1. An argon-oxygen mixture was blown onto the surface of molten iton for decarburization. Even though the oxygen partial pressure was quite low, an oxide film formed on the melt surface and reduced the rate of decarburization. The experimental result is explained by a reaction model in which the rate process at the oxide film is considered.2. In experiments of decarburization of molten iron in magnesia, alumina and calcia crucibles with blowing argon gas, carbon in the melt reacted with crucible oxides to form CO. A reaction model is proposed in which the dissociation reaction of the oxide, CO formation reaction at the crucibleoxide interface, etc. are taken into account. The model can explain the experimental results.3. In order to enhance the decarburization rate of molten iron and ironchromium alloy with solid oxides, the vacuum suction degassing method was adopted for decarburization in a very low carbon concentration range. The principle of the method'is that the CO gas formed at the reaction interface is sucked through the porous oxide, the other side of which is kept at a vacuum. The decarburization experiments were made by immersing a porous tube into the melt. The inside of the tube was evacuated. The components of the tube were Al_2O_3, SiO_2, MnO, Fe_2O_3, Cr_2O_3, etc. The decarburiza-tion rate was higher for the oxide of higher dissociation pressure and the tube of larger porosity. An Al_2O_3-SiO_<> tube could decarburize the melt much faster than an Al_2O_3 tube. Moreover, the decarburization rate was higher for the tube containing SiO_2 in the form of cristbalite (SiO_2) than in the form of mullite (3Al_2O_3・2SiO_2). The melt tended to penetrate into the pore of Al_2O_3-Fe_2O_3 tube.

1.将Ar-O2混合气体吹入熔化的ITN表面进行脱碳。尽管氧分压很低，但在熔体表面形成了一层氧化膜，降低了脱碳速度。实验结果用考虑了氧化膜速率过程的反应模型进行了解释。在镁质、氧化铝和钙质坩埚中用吹气进行铁水脱碳实验中，熔体中的碳与坩埚氧化物反应生成CO。提出了一个反应模型，该模型考虑了氧化物的离解反应、金属氧化物界面上的CO生成反应等。该模型能够较好地解释实验结果。为了提高铁水和铁铬合金固体氧化物的脱碳速度，采用真空吸气脱气法在很低的碳浓度范围内进行脱碳。该方法的原理是，在反应界面上形成的CO气体通过多孔氧化物被吸入，而多孔氧化物的另一面保持真空。通过在熔体中浸入多孔管进行了脱碳实验。管子的内部被抽空了。炉管的成分为Al_2O_3、SiO_2、MnO、Fe_2O_3、Cr_2O_3等，解离压力高的氧化物和气孔率大的炉管脱碳率较高。Al_2O_3-SiO_2管子比Al_2O_3管子对熔体的脱碳速度快得多。含SiO_2的方石英(SiO_2)的脱碳率高于莫来石(3Al_2O_3·2SiO_2)的脱碳率。熔体有向Al_2O_3-Fe_2O_3管内渗透的趋势。