New Mold Slag Compositions for the Continuous Casting of Soft Steels,Steel Research International

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New Mold Slag Compositions for the Continuous Casting of Soft Steels
Steel Research International ( IF 1.9 ) Pub Date : 2021-05-24 , DOI: 10.1002/srin.202100165
Nathalie Kölbl ₁

Affiliation

Several fluorine-free mold slag compositions have already been established in the literature. In all cases, the formation of a crystalline phase exhibiting behavior similar to that of cuspidine is emphasized to control horizontal heat transfer without influencing the lubrication performance for the casting of peritectic steel grades. In contrast, for casting soft steels, glassy solidification of the slag is required. Herein, different slag compositions involving the selected oxides are developed with the help of FactSage calculations. Mixtures of pure raw materials are melted at 1673 K and quenched to 295 K. It is observed that B₂O₃ increases the glass-forming ability of the slags. To obtain the glassy phase, the composition must satisfy the conditions

\frac{CaO + MgO}{{Al}_{2} O_{3} + {SiO}_{2}} < 0.9

$\frac{CaO + MgO}{{Al}_{2} O_{3} + {SiO}_{2}} < 0.9$ and

(CaO + MgO) < 30 wt %

$(CaO + MgO) < 30 wt %$ . For TiO₂ content <10 wt%, glassy solidification is detected after quenching to room temperature. However, this phenomenon-is not observed for slags with TiO₂ content >15 wt%. Moreover, the addition of alumina and alkali oxides enhances crystallization. Based on these findings, promising mold slag compositions are designed and characterized in the laboratory using a furnace crystallization test, mineralogical investigations, and the single/double hot thermocouple technique. From the investigated mixtures, three compositions are suggested for use in continuous casting processes.

中文翻译：

用于软钢连铸的新型结晶器渣成分

文献中已经建立了几种无氟结晶渣组合物。在所有情况下，都强调结晶相的形成表现出与尖晶石相似的行为，以控制水平传热而不影响包晶钢铸件的润滑性能。相反，铸造软钢则需要熔渣的玻璃状凝固。在此，在 FactSage 计算的帮助下，开发了涉及所选氧化物的不同炉渣成分。纯原料的混合物在 1673 K 下熔化并淬火到 295 K。观察到 B ₂ O ₃增加了熔渣的玻璃形成能力。为了获得玻璃相，组合物必须满足条件

\frac{CaO + MgO}{{Al}_{2} O_{3} + {SiO}_{2}} < 0.9

$\frac{CaO + MgO}{{Al}_{2} O_{3} + {SiO}_{2}} < 0.9$ 和

(CaO + MgO) < 30 wt %

$(CaO + MgO) < 30 wt %$ . 对于 <10 wt% 的 TiO ₂含量，淬火至室温后检测到玻璃态凝固。_{然而，对于 TiO 2}含量 >15 wt%的炉渣没有观察到这种现象。此外，氧化铝和碱金属氧化物的加入增强了结晶。基于这些发现，在实验室中使用熔炉结晶测试、矿物学研究和单/双热电偶技术设计和表征了有前景的结晶器渣成分。从所研究的混合物中，建议在连续铸造工艺中使用三种组合物。

更新日期：2021-05-24

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