(1. State Key Laboratory of Advanced Special Steel, Shanghai 200444, China 2. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China)
Abstract:Non-quenched and tempered steel contains high aluminum and sulfur, which often causes the nozzle clogging during continuous casting and hampers the production. In order to explore the cause of the nozzle clogging of non-quenched and tempered steel, and propose preventive measures, the X-ray fluorescence, the X-ray diffraction and the thermodynamic calculation were used to analyze the clogs of the nozzle of 49MnVS. The results showed that those blockages were mainly CaO?6Al2O3, CaO?Al2O3, MgO?Al2O3 and Fe. The calcium yield in the production was only 53.33% of the goal. The thermodynamic calculation indicated that the low ratio of calcium and aluminum caused the nozzle clogging and formed a large amount CaO?6Al2O3 and CaO?Al2O3 inclusions with a high melting point, which adhered and aggregated at the nozzle. At the same time, the erosion of the MgO-C nozzle leaded to the collision of MgO and Al2O3 and formed MgO?Al2O3 in turbulent flow zones. The solidification and adhesion of iron droplets in the pore of inclusions caused the growth of blockages and completely blocked the nozzle. Therefore, it is possible to prevent the nozzle clogging by optimizing the feeding operation, controlling the ratio of calcium and aluminum in the range of 0.127 to 0.225 and improving the materials of nozzle.
Yunhong H E.Study on Fluidity of Non-quenched and Tempered Steel F45MnVS[J][J].Shanxi Metallurgy, 2017, :-
[5]
Yunhong H E.Study on Fluidity of Non-quenched and Tempered Steel F45MnVS[J][J].Shanxi Metallurgy, 2017, :-
[6]
Holappa L, Liukkonen M, et al.Thermodynamic examination of inclusion modification and precipitation from calcium treatment to solidified steel[J].Ironmaking & Steelmaking, 2013, 30(2):111-115
[6]
Holappa L, Liukkonen M, et al.Thermodynamic examination of inclusion modification and precipitation from calcium treatment to solidified steel[J].Ironmaking & Steelmaking, 2013, 30(2):111-115
[7]
Abdelaziz S, Megahed G, El-Mahallawi I, et al.Control of Ca addition for improved cleanness of low C,Al killed steel[J].Ironmaking & Steelmaking, 2009, 36(6):432-441
[7]
Abdelaziz S, Megahed G, El-Mahallawi I, et al.Control of Ca addition for improved cleanness of low C,Al killed steel[J].Ironmaking & Steelmaking, 2009, 36(6):432-441
Dekkers R, Blanpain B, Wollants P, et al.A Morphological Comparison between Inclusions in Aluminium Killed Steels and Deposits in Submerged Entry Nozzle[J].Steel Research International, 2003, 74(6):351-
[9]
Dekkers R, Blanpain B, Wollants P, et al.A Morphological Comparison between Inclusions in Aluminium Killed Steels and Deposits in Submerged Entry Nozzle[J].Steel Research International, 2003, 74(6):351-
[10]
Guo Y T, He S P, Chen G J, et al.Improvement in castability of Al containing resulphurised free machining steel[J].Ironmaking & Steelmaking, 2014, 41(10):738-747
[10]
Guo Y T, He S P, Chen G J, et al.Improvement in castability of Al containing resulphurised free machining steel[J].Ironmaking & Steelmaking, 2014, 41(10):738-747
[11]
Lamut J, Falkus J, Jurjevec B, et al.Influence of Inclusions Modification on Nozzle Clogging[J].Archives of Metallurgy & Materials, 2012, 57(1):319-
[11]
Lamut J, Falkus J, Jurjevec B, et al.Influence of Inclusions Modification on Nozzle Clogging[J].Archives of Metallurgy & Materials, 2012, 57(1):319-
[12]
Shin J H, Park J H.Formation Mechanism of Oxide-Sulfide Complex Inclusions in High-Sulfur-Containing Steel Melts[J].Metallurgical & Materials Transactions B, 2017, :-
[12]
Shin J H, Park J H.Formation Mechanism of Oxide-Sulfide Complex Inclusions in High-Sulfur-Containing Steel Melts[J].Metallurgical & Materials Transactions B, 2017, :-