摘要
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-SiO_(2)系和新开发的低反应性BaO-Al_(2)O_(3)-SiO_(2)-TiO_(2)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Al_(2)O_(3),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Al_(2)O_(3)含量的增加而增加,但新开发的低反应性保护渣相对于CaO-SiO_(2)系渣的性能变化更小,其性能更稳定;由旋转柱试验可知,CaO-SiO_(2)系和BaO-Al_(2)O_(3)-SiO_(2)-TiO_(2)系保护渣对氧化铝棒的吸收速率分别在(8~12)×10^(-3) g/(cm^(2)·min)和(10~13)×10^(-3) g/(cm^(2)·min),后者对夹杂物的吸收能力更强。因此,新开发的BaO-Al_(2)O_(3)-SiO_(2)-TiO_(2)系低反应性保护渣有潜力用于更高钛含量的钢种浇铸。
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-SiO_(2) system and the newly developed low reactivity BaO-Al_(2)O_(3)-SiO_(2)-TiO_(2) system with different percentage of Al_(2)O_(3) 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 Al_(2)O_(3).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-SiO_(2) system,and its performance is more stable.By rotating cylinder experiment,it can be seen that the absorption rate of CaO-SiO_(2) and BaO-Al_(2)O_(3)-SiO_(2)-TiO_(2) mold slag is within(8-12)×10^(-3) g/(cm^(2)·min)and(10-13)×10^(-3) g/(cm^(2)·min),respectively,and the latter has stronger absorption capacity on inclusions.Therefore,the designed BaO-Al_(2)O_(3)-SiO_(2)-TiO_(2) low reactive mold slag has the potential to be used for the casting of high-titanium steel with higher titanium content.
作者
王学友
王军
张旭彬
何生平
WANG Xueyou;WANG Jun;ZHANG Xubin;HE Shengping(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Technical Center,Hunan Valin Xiangtan Iron&Steel Co.,Ltd.,Xiangtan 411100,China)
出处
《炼钢》
CAS
北大核心
2024年第3期66-71,81,共7页
Steelmaking
关键词
高钛钢
保护渣
夹杂物
氧化铝
high-titanium steel
mold slag
inclusions
aluminum oxide
