D2 高速铁路车轮钢中大尺寸 CaO-Al2O3-SiO2 杂质的特征、形成机理及去除方法

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-08-30 DOI:10.1002/srin.202400497

Daohua Bao, Guoguang Cheng, Jinwen Zhang, Zhixiang Wang, Wei Li, Yao Li, Tao Zhang

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引用次数: 0

摘要

研究了 D2 高速铁路车轮钢中大尺寸 CaO-Al2O3-SiO2 夹杂的特征、形成机理和去除方法。连铸坯中存在大尺寸的 CaO-Al2O3-SiO2 夹杂，SiO2 和 CaO 含量分别为 5 至 15 和 30 至 65 wt%。尺寸主要超过 10 μm。这些夹杂物源自精炼过程中的钙处理阶段，在这一阶段，钢液中形成了 CaO-Al2O3-SiO2 液态夹杂物。这些夹杂物与钢液的接触角低于 40°，因此具有极佳的润湿性。因此，这些夹杂物很难从钢液中去除，并会遗留在钢坯中。通过降低 SiO2 含量并将 CaO 含量控制在 8-30 wt% 之间，可形成小尺寸夹杂物。这就需要合理控制钢液中的铝和钙含量。当钢液中的 Al 和 Ca 含量分别保持在 0.012 wt% 和 8 ppm 时，钢坯中的夹杂物主要是 CaO-6Al2O3 (CA6) 和 CaO-2Al2O3 (CA2)，尺寸均小于 5 μm。这些夹杂物代表了钢中合适的夹杂物。

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Characteristics, Formation Mechanism, and Removal of Large‐Sized CaO–Al2O3–SiO2 Inclusions in D2 High‐Speed Railway Wheel Steel

The characteristics, formation mechanism, and removal of large‐sized CaO–Al2O3–SiO2 inclusions in D2 high‐speed railway wheel steel are investigated. Large‐sized CaO–Al2O3–SiO2 inclusions are present in the continuous casting billet, with SiO2 and CaO content ranging from 5 to 15 and 30 to 65 wt%, respectively. The size mainly exceeds 10 μm. These inclusions originate from the calcium‐treatment stage of the refining process, during which liquid CaO–Al2O3–SiO2 inclusions are formed in the liquid steel. The contact angle between these inclusions and the liquid steel is below 40°, which results in excellent wettability. Consequently, the inclusions are difficult to remove from the liquid steel and are thus inherited into the billet. By reducing the SiO2 content and controlling CaO content between 8 and 30 wt%, small‐sized inclusions are formed. This requires reasonable control of the Al and Ca content in the liquid steel. When the Al and Ca content in liquid steel is maintained at 0.012 wt% and 8 ppm, respectively, the inclusions in the billet are mainly CaO·6Al2O3 (CA6) and CaO·2Al2O3 (CA2), both under 5 μm in size. These inclusions represent the suitable inclusions in steel.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.