Effect of Different Power Supply Modes on Inclusion in 304L Stainless Steel Electroslag Ingot

The use of low frequency or DC (i.e., direct current) operation in the electroslag remelting process may lead to electrolysis some oxides slag pool, which will adversely affect cleanliness ingot. In order confirm this view, effect different power supply modes on oxygen content and inclusions ingot has been studied by adopting self-designed furnace as experimental equipment. pulse heating inert gas fusion-infra-red absorption method is used for analyzing content. analysis non-metallic inclusion conducted using an automatic SEM scanning electron microscope) made American ASPEX Company, where type size are determined. Results show that increase significantly compared with consumable metal electrode, whether under 50 Hz, low-frequency, DC. When DCSP electrode connected cathode supply), DCRP anode 2 10 Hz adopted, 155.3 ppm, 100.4 75.8 66.3 43.2 ppm respectively. With content, number ingots increases significantly, increased mainly Al2O3 inclusions. Regardless mode, largest diameter less than 20 μm. reason when CaF2-Al2O3 used. decrease frequency, trend increases, also increase. However, most regenerated pool temperature solidification, so fine.