Five Principles of Induction Melting Furnace Steelmaking

Five Principles of Loading

1. Understand the three areas of heat distribution in the crucible

High temperature zone: around the middle and lower parts of the crucible, due to the electric skin effect is the magnetic field line enrichment zone, it is advisable to add refractory alloys in this zone and insert large cross-section strips.

Sub-high temperature zone: the middle of the bottom of the crucible.

Low temperature zone: The upper part of the crucible dissipates large heat and the magnetic field lines are scattered. If the bottom of the crucible is placed improperly, the sub-high temperature zone at the bottom will become a low temperature zone.

2. Form a metal molten pool as soon as possible, divided into two situations

There are more steel scraps in the charge and less activity or no activity. If there is more furnace bottom, it is not advisable to add lime to prevent steel from slagging; less and small materials form a molten pool before adding steel scraps; if there is no steel scrap, add 2-4 kg of lime to the furnace bottom. Make the slag have a certain alkalinity during melting, 2.2-2.8 is conducive to desulfurization and phosphorus stabilization.

For this reason, small materials should be collected separately. When the furnace is turned on, it is quickly added to the sub-high temperature zone of the crucible to form a molten pool as soon as possible. Only the molten pool can absorb more magnetic lines of force to accelerate the melting.

3. The ferro-tungsten and ferro-molybdenum should be put into the high-temperature zone at the right time to ensure uniform composition, to prevent the unrepresentative fusion sample and the segregation of precious alloy elements in the finished product, but it should not be too early to prevent the ferro-tungsten from sinking to the bottom.

4. Oil and steel scraps are mostly added in early batches. After adding oil and steel scraps, use Huangshi deoxidizer or packaging composite silicomanganese aluminum to insert precipitation deoxidation, and the product part is oxide deoxidation product, such as steel. Dissolved oxygen is too high, and new liquid oxides are formed at high temperatures, which will later be inherited into electroslag remelting and reduce the purity of steel. [H] It is difficult to remove during electroslag remelting, and white spots and cracks are formed on the ingot billet.

5. When installing the furnace, pay attention to the order in which the charge falls to prevent bridging and jamming. Do not use the crucible wall as a fulcrum to pry the material, and do not hit the upper part of the crucible against the adhering furnace wall nodular oxide slag, which will damage the crucible and reduce the life of the crucible. It can be removed by chemical methods, such as adding a slag remover to the furnace wall during the melting process