The erosion patterns of MgO·Al_(2)O_(3) spinel as a crucible material in special steel smelting and its impact on molten steel cleanliness are investigated.MgO·Al_(2)O_(3) spinel refractories used in industr...The erosion patterns of MgO·Al_(2)O_(3) spinel as a crucible material in special steel smelting and its impact on molten steel cleanliness are investigated.MgO·Al_(2)O_(3) spinel refractories used in industrial high-nitrogen stainless steel bearing steel smelting are analyzed and tested.Results indicate that during vacuum carbon deoxidation,MgO·Al_(2)O_(3) spinel partially decomposes,and the released[Mg]reacts with Al_(2)O_(3) inclusions in the steel to form MgO·Al_(2)O_(3) inclusions,promoting inclusion flotation and improving molten steel cleanliness.Due to the unique structure of MgO·Al_(2)O_(3) spinel,iron diffuses into the spinel form MgAl_(1.9)Fe_(0.1)O_(4),which prevents further erosion.The high-pressure nitrogen smelting process also causes a small amount of AlN on the surface of the MgO·Al_(2)O_(3) spinel crucible,further enhancing its high-temperature performance.After smelting,a deposit layer primarily composed of MgO,Al_(2)O_(3),and MgO·Al_(2)O_(3) spinel forms on the inner wall of the crucible,indicating that floating inclusions adhere to the spinel surface,thereby reducing the incorporation into the steel and improving molten steel cleanliness.These findings provide a theoretical foundation for broader application of MgO·Al_(2)O_(3) spinel as a crucible material in the field of high-quality steel.展开更多
基金supported by National Key Research and Development Program of China(2021YFB3701404)the National Natural Science Foundation of China(Grant Nos.52174302 and 52304347)+4 种基金the Fundamental Research Funds for the Central Universities(N2409008)Postdoctoral Fellowship Program of CPSF(GZB20230122)Doctoral Start-up Foundation of Liaoning Province(2023-BSBA-107)China Baowu Low Carbon Metallurgy Innovation Foundation(BWLCF202320)Young Elite Scientist Sponsorship Program by Cast(Grant No.YESS20240132).
文摘The erosion patterns of MgO·Al_(2)O_(3) spinel as a crucible material in special steel smelting and its impact on molten steel cleanliness are investigated.MgO·Al_(2)O_(3) spinel refractories used in industrial high-nitrogen stainless steel bearing steel smelting are analyzed and tested.Results indicate that during vacuum carbon deoxidation,MgO·Al_(2)O_(3) spinel partially decomposes,and the released[Mg]reacts with Al_(2)O_(3) inclusions in the steel to form MgO·Al_(2)O_(3) inclusions,promoting inclusion flotation and improving molten steel cleanliness.Due to the unique structure of MgO·Al_(2)O_(3) spinel,iron diffuses into the spinel form MgAl_(1.9)Fe_(0.1)O_(4),which prevents further erosion.The high-pressure nitrogen smelting process also causes a small amount of AlN on the surface of the MgO·Al_(2)O_(3) spinel crucible,further enhancing its high-temperature performance.After smelting,a deposit layer primarily composed of MgO,Al_(2)O_(3),and MgO·Al_(2)O_(3) spinel forms on the inner wall of the crucible,indicating that floating inclusions adhere to the spinel surface,thereby reducing the incorporation into the steel and improving molten steel cleanliness.These findings provide a theoretical foundation for broader application of MgO·Al_(2)O_(3) spinel as a crucible material in the field of high-quality steel.
