首页|高钛钢连铸保护渣对A12O3夹杂物吸收性的研究

高钛钢连铸保护渣对A12O3夹杂物吸收性的研究

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针对高钛钢连铸保护渣钢渣反应及吸收夹杂物的变性问题,采用热力学计算、保护渣性能测试和旋转柱法等方法,对高钛钢钢液内夹杂物的生成种类和不同温度下的生成量进行了计算,根据夹杂物的生成情况对比了传统CaO-SiO2系和新开发的低反应性BaO-Al2O3-SiO2-TiO2系保护渣吸收夹杂物的性能变化,并对比了两种保护渣对夹杂物的吸收速率.热力学计算表明,研究的高钛钢中铝质量分数为0.03%、钛质量分数为0.40%,钢液中生成的夹杂物为Al2O3,而实际生产中由于钢液局部成分差异可能有钛氧化物的生成;从保护渣吸收夹杂物前后的性能对比可知,两种保护渣的黏度和熔点均随其吸收Al2O3含量的增加而增加,但新开发的低反应性保护渣相对于CaO-SiO2系渣的性能变化更小,其性能更稳定;由旋转柱试验可知,CaO-SiO2系和BaO-Al2O3-SiO2-TiO2系保护渣对氧化铝棒的吸收速率分别在(8~12)× 10-3g/(cm2·min)和(10~13)× 10-3g/(cm2·min),后者对夹杂物的吸收能力更强.因此,新开发的BaO-Al2O3-SiO2-TiO2系低反应性保护渣有潜力用于更高钛含量的钢种浇铸.
Study on the absorption of Al2O3 inclusions by mold slag for the continuous casting of high-titanium steel
In order to solve the problem that the performance of the mold slag changed under the high-titanium steel and slag reaction and the absorption of the inclusion into mold slag,types of inclusions formed in high titanium molten steel and the amount of inclusions formed at different temperatures were calculated by means of thermodynamic calculation.Besides,according to the formation of inclusions,the performance of the traditional CaO-SiO2 system and the newly developed low reactivity BaO-Al2O3-SiO2-TiO2 system with different percentage of Al2O3 absorption was compared through the performance measurement of mold slag,and the absorption rates of the two types of inclusions were compared by the rotating cylinder method.The thermodynamic calculation shows that with the aluminum mass fraction of the high-titanium steel in this study 0.03%and the titanium mass fraction 0.40%,and the inclusion generated in the molten steel is Al2O3.In actual production,titanium oxides may be formed due to the local composition difference in the molten steel.Results show that the viscosity and melting point of the two types of slag increase with the increase of the content of alumina absorbed by the slag,but the newly developed low reactivity slag has less change than that of CaO-SiO2 system,and its performance is more stable.By rotating cylinder experiment,it can be seen that the absorption rate of CaO-SiO2 and BaO-Al2O3-SiO2-TiO2 mold slag is within(8-12)× 10-3 g/(cm2·min)and(10-13)× 10-3g/(cm2·min),respectively,and the latter has stronger absorption capacity on inclusions.Therefore,the designed BaO-Al2O3-SiO2-TiO2 low reactive mold slag has the potential to be used for the casting of high-titanium steel with higher titanium content.

high-titanium steelmold slaginclusionsaluminum oxide

王学友、王军、张旭彬、何生平

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重庆大学材料科学与工程学院,重庆 400044

湖南华菱湘潭钢铁集团有限公司技术中心,湖南湘潭 411100

高钛钢 保护渣 夹杂物 氧化铝

2024

炼钢
武汉钢铁(集团)公司 中国金属学会

炼钢

北大核心
影响因子:0.339
ISSN:1002-1043
年,卷(期):2024.40(3)
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