Effect of Calcium Treatment on Inclusions in H08A Welding Rod Steel

The effect of calcium treatment on inclusions in H08A welding rod steel was studied by industrial experiment and using thermodynamics theory. effects inclusion composition, morphology, quantity, size before after were metallographic microscope, scanning electron microscope (SEM), energy dispersive spectrometer (EDS). Thermodynamic studies show that the addition can form various forms xCaO·yAl2O3, under condition composition molten remains unchanged, control content is key to generate low melting point calcium-aluminate complex non-metallic improve quality steel. production practice plant shows for steels, a suitable range meet requirements treatment. Effective not only transform high Al2O3 into between 3CaO·Al2O3 12CaO·7Al2O3, but also make original shape-diversified spherical inclusions. Meanwhile, total number large-scale are reduced, tend disperse steel, which very conducive improvement quality. results modification path magnesium aluminate spinel as follows: → MgO-Al2O3 MgO-CaO-Al2O3. In addition, modify liquid MgO-CaO-Al2O3 with point.