Control of MgO·Al_2O_3 Spinel Inclusions in Stainless Steels

摘要

The latest publications regarding the development of technology to control inclusion compositions focusing on MgO·Al_2O_3 spinel inclusions were summarized in this review article. The problems caused by spinel inclusions, which affect practice as well as products were shown. The formation mechanism of MgO·Al_2O_3 spinel inclusions is secondly explained thermodynamically from the view points of chemistries of molten steels and slag compositions. Furthermore, crystallization behaviour of spinel was introduced. Countermea-sures conducted in practices and laboratories were shown along with some problems still left that should be solved in the future.