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首页> 外文期刊>ISIJ international >Thermodynamic Evaluation Of Formation Of Oxide-sulfide Duplex Inclusions In Steel
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Thermodynamic Evaluation Of Formation Of Oxide-sulfide Duplex Inclusions In Steel

机译：钢中氧化物-硫化物双相夹杂物形成的热力学评估

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摘要

Calcium is widely used for improving the castability of liquid steel, as well as for improvement of steel cleanliness and inclusion modification for better quality steel. Calcium modifies solid alumina inclusions, arising out of deoxidation of liquid steel, into liquid calcium aluminate. Depending upon the steel composition, calcium sulfide (CaS) and/or various forms of calcium aluminates may form. Sulfides are often associated with the oxide phase, which is typically known as oxide-sulfide duplex inclusion. Formation of solid calcium sulfide must be avoided during the ladle treatment of liquid steel, since it is detrimental to the castability of steel. In the present work a thermodynamic model has been developed for predicting the formation of oxide-sulfide duplex inclusions arising out of competitive reactions between [O], [S] and [Ca] in Al-killed steel. The model predictions of the present work were compared with those reported in literature, as well as with the types of inclusions observed in steel samples collected from the plant. Reasonably good agreements amongst them were observed. The results indicated that in order to achieve completely liquid calcium aluminate without forming any sulfides the sulfur content of liquid steel must be sufficiently low. With increasing S content of liquid steel, complete modification of alumina inclusions into liquid calcium aluminate becomes difficult. The maximum sulfur content to avoid formation of CaS depends upon the steel composition, principally aluminum. The sulfide inclusions are often a solid solution of CaS and MnS. Thermodynamic analysis for this system was also carried out. Based on the analysis in the present work, it is possible to predict the influence of sulfide composition on formation of duplex inclusions.
机译：钙被广泛用于改善液态钢的铸造性能，以及改善钢的清洁度和改善优质钢的夹杂物改性。钙将液态钢的脱氧产生的固态氧化铝夹杂物改性为液态铝酸钙。根据钢的成分，可能会形成硫化钙（CaS）和/或各种形式的铝酸钙。硫化物通常与氧化物相相关联，通常被称为氧化物-硫化物双相夹杂物。在钢水包处理期间必须避免形成固态硫化钙，因为这对钢的可铸性有害。在本工作中，已经开发了一种热力学模型，用于预测铝镇静钢中[O]，[S]和[Ca]之间竞争反应引起的氧化物-硫化物双重夹杂物的形成。将当前工作的模型预测结果与文献报道的预测结果以及从工厂收集的钢样中观察到的夹杂物类型进行了比较。他们之间观察到合理的良好协议。结果表明，为了获得完全液态的铝酸钙而不形成任何硫化物，液态钢的硫含量必须足够低。随着液态钢中S含量的增加，很难将氧化铝夹杂物完全改性成液态铝酸钙。避免形成CaS的最大硫含量取决于钢成分，主要是铝。硫化物夹杂物通常是CaS和MnS的固溶体。还对该系统进行了热力学分析。基于当前工作的分析，可以预测硫化物组成对双相夹杂物形成的影响。

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