切割丝生产过程夹杂物特征研究

摘要/Abstract

摘要： 通过全流程系统取样，详细讨论了高端切割丝中夹杂物的生成规律。结果表明：Si-Mn脱氧与低碱度渣精炼时，软吹结束后夹杂物成分已集中分布于MnO-SiO₂-Al₂O₃或CaO-SiO₂-Al₂O₃三元系低熔点区。前者为内生夹杂物，后者为精炼渣卷入钢液乳化而造成的外来夹杂物。MnO-SiO₂-Al₂O₃系夹杂物中SiO₂含量在连铸坯凝固时明显增加，导致SiO₂析出形成双相复合夹杂物。热轧时二者由于变形性能的差别而逐渐发生相分离，最终在盘条中形成单独存在的SiO₂夹杂物。此类高SiO₂夹杂物在拉拔时将破碎而沿轧向成为不连续、细小点状夹杂物：切割丝连续拉拔至29 602 km时一直未发现高SiO₂夹杂物导致的断丝。因此，高端切割丝中夹杂物的控制不必过分强调夹杂物低熔点化，而应着眼于全流程控制并实现最终夹杂物的细小化。

关键词: 切割丝, 夹杂物, 成分, 形态, 尺寸

Abstract: In present study, formation of inclusions in high quality saw wires were discussed in details by systematical samples in pilot trials. It was found that inclusions have readily located in the lower melting point regions of MnO-SiO₂-Al₂O₃ and CaO-SiO₂-Al₂O₃ ternary systems. The former type of inclusions was endogenous ones originated from the chemical reactions between liquid steel and the Si-Mn deoxidation products. While the latter was caused by the entrapment and the following emulsion the of top slag particles into molten steel. During the solidification of liquid steel in continuous casting, silica content in the formed MnO-SiO₂-Al₂O₃ in secondary refining showed an obvious increase, resulted in the precipitation of pure SiO2 phase in the inclusion matrix. Because of the differences in deformability, the newly produced dual-phased inclusions would be gradually separated from each other in the following multi-pass rolling. Therefore, SiO₂based inclusions singularly existed in the steel can be frequently observed in the rolled coils. However, it was impressive that those SiO₂based inclusions was changed into very tiny dotshaped particles dispersed along the rolling direction. Particularly, the coil was continuously drawn to 29 602 km without fracture despite the existence of the SiO₂based inclusions. Therefore, it was concluded that there was no need to emphasize on the targeting of lower melting point of inclusions for saw wires. Instead, systematic optimization of the whole process and size minimization of inclusions were considered to be more important.

Key words: saw wire, inclusion, composition, morphology, thickness

王昆鹏1，王新华1，姜敏1，赵昊乾2，王郢2. 切割丝生产过程夹杂物特征研究[J]. 炼钢, 2016, 32(4): 17-22.

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切割丝生产过程夹杂物特征研究

Study on non-metallic inclusions in high quality saw wires

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