1. Furnace material requirements: no oil and no rust, scrap steel requires no excessive oxidation on the surface.
2. Generally, it is prepared by adding 4 kg of recarburizer for every 100 kg of scrap steel.
3. The temperature of the furnace is controlled at 1550°C. It is expected that the nodularization temperature will drop by 100°C, and the temperature of the bag will drop by 50°C.
4. During the production of the first furnace, 10-20 kg of high-quality iron chips are added to the bottom of the electric furnace. When the second furnace starts production, 20-40 kg of the remaining molten iron from the previous furnace is used.
5. After the iron chip is added, put the prescribed recarburizer into the plastic bag and put it on the iron chip. From the second furnace, 20-40 kg of the remaining molten iron is put into a plastic bag and the recarburizer is put into the molten iron surface.
6. Add 50 kg of scrap steel with small carbon particles (less than 50×50 area), and cover the entire furnace pond tightly.

7. Start melting, add remaining steel scrap → add pig iron → add returned iron (note that there should not be too much sand on the surface of the returned iron (to prevent the carburant from bonding with sand to affect the absorption).
8. Cover the molten iron with a covering agent after melting, and clean the slag repeatedly 2-3 times when the temperature reaches 1400°C.
9. Spheroidizing treatment Put the spheroidizing agent and ferrosilicon into the hanging package and cover the surface with high-quality iron chips.
10. After smelting, use a high-quality slag remover to clean the slag on the liquid surface in the furnace for 2-3 times, and check the temperature of the molten iron at 1550°C-1600°C.