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Inclusion Formation in Si-Mn Killed Steel Exposed to Al-containing MgO-C Refractory Under Vacuum Conditions

机译：在真空条件下，在Si-Mn杀死Si-Mn杀死钢的杀死钢（在真空条件下

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Si-Mn killed steel for saw wire and valve spring applications, is very sensitive to hard and non-deformable Al_2O_3-rich inclusions. These inclusions are very likely to cause crack initiation and strongly impair the drawability of saw wire and fatigue restraint properties of valve springs'1'2'. To avoid the generation of Al_2O_3-rich inclusions, a technology of Si-Mn deoxidation combined with low basicity top slag refining is widely applied in the production of both saw wire and valve spring steels'3'4'. This technology has also been employed to limit the [Al] content in saw wire steel to a very low level (0.0005 wt-%). However Al_2O_3-rich inclusions were still detected in the wire rod and large-sized Al_2O_3-rich inclusions were frequently observed on the fracture surface of saw wire (Fig. 1). In order to avoid the generation of these Al_2O_3-rich inclusions, this study was designed to investigate their potential source.
机译：Si-Mn用于锯线和阀门弹簧应用的Si-Mn杀死钢，对硬质和不可变形的Al_2O_3的夹杂物非常敏感。这些夹杂物很可能导致裂纹启动，并强烈损害阀杆的锯线和疲劳约束性能的可疲劳性。为避免生成富含AL_2O_3的夹杂物，将Si-Mn脱氧的技术与低碱度顶部炉渣精炼相结合，广泛应用于锯线和阀门弹簧钢材的生产中。该技术还被采用将锯线钢中的[Al]含量限制为非常低的水平（0.0005重量％）。然而，在锯线的断裂表面上仍然检测到富含富杆的富含含量的富含型Al_2O_3的夹杂物（图1）。为了避免产生这些AL_2O_3丰富的夹杂物，本研究旨在调查它们的潜在来源。

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