How to make steel in the intermediate frequency furnace?_Energy saving induction heating equipment manufacturers

How to make steel in the intermediate frequency furnace?
The first is the preparation of medium frequency furnace steelmaking:
1. When preparing steelmaking, the inspection work in the early stage cannot be ignored. It is necessary to first understand the condition of the furnace lining, whether the production tools are complete, and whether the intermediate frequency furnace panel is normal.
2. Each of the two furnace seats is a group, and the necessary items such as ferrosilicon, medium manganese, synthetic slag, and heat preservation agent should be prepared in place and placed in the middle of the furnace.
3, the steel must be in place, the steel preparation is not complete and can not be opened.
4, need to pay attention to the intermediate frequency furnace insulation rubber mats placed, it is strictly prohibited to leave a gap.
Secondly, the attention of the intermediate frequency furnace steelmaking into the production stage:
1. The new furnace lining is strictly in accordance with the requirements of the new furnace baking process, and the baking time should be more than 2 hours.
2. Firstly add a suction cup and small material to protect the furnace lining in the furnace. It is not allowed to directly add the bulk material into the empty furnace, and then electrify. At this time, the furnace front worker should timely add the small material scattered around the furnace into the furnace, and it is strictly forbidden to fall. The furnace table and the silicon steel sheet punch are only allowed to be used in the oven, and the rest of the time is not allowed.
3. The disk hoisting material is lifted from the material yard to the furnace table, and the scrap steel is sorted by the furnace worker. The sorted flammable and explosive materials are directly placed in the special collection box, and the furnace platform security is registered for confirmation.
4. The special collection box for flammable and explosive materials is placed in the middle of two sets of furnace seats, and no one should move at will.
5. The pre-furnace feeding is mainly based on manual feeding. After the furnace scrap is carefully sorted, the material with the length less than 400mm is confirmed by the furnace chief. The carefully selected materials can be added by the suction cup, and the driving conductor is small for each furnace. The length of the furnace, if other people direct the suction cup to feed, the trainer is not allowed to add.
6. The suction cup should be controlled to increase the amount of scrap. After the addition, the scrap steel is not allowed to exceed the plane of the medium frequency furnace, and the scrap steel scattered around the furnace mouth is cleaned. During the feeding process, the middle frequency furnace must be kept clean around to prevent the scrap steel material from falling and causing the induction coil or cable joint to catch fire.
7. It is strictly forbidden to stack large quantities of scrap steel on the platform. The total amount is controlled within 3 suction cups to reduce the difficulty of scrap sorting.
8. In the event of an explosion, the operator should immediately turn his back to the furnace mouth and quickly move away from the scene.
9. In the process of pre-feeding, for long materials and large blocks, it must be erected into the furnace so that it can be melted into the molten pool as soon as possible. It is strictly forbidden to join the bridge to cause bridging. If the charge is found to be bridged, the bridge must be destroyed in 3 minutes. The furnace charge is quickly melted into the molten pool. If the bridge cannot be destroyed within 3 minutes, the bridge must be de-energized or destroyed in the insulated state before the power can be sent to normal smelting.
10. For some heavy steel workers who need more than 2 people to move into the furnace, it is strictly forbidden to throw into the furnace. A transition should be made on the furnace edge and then carefully pushed into the furnace.
11. Tubular scrap steel is added into the furnace, and the upper port of the pipe should be oriented in the direction of tapping, and it is not allowed to move in the direction of human operation.
For the cold steel and short-head continuous casting billet in the slag bag and the tundish, it should be erected into the furnace after the molten steel in the intermediate frequency furnace reaches 2/3 or more, and it is not allowed to hit the furnace lining.
13. Sampling and analysis should be carried out when the medium frequency furnace molten steel reaches 70% or more. The samples must be free of shrinkage holes and other defects. The steel bars must not be inserted into the sample cup. After the chemical composition of the samples is obtained, the personnel of the matching elements are determined according to the comprehensive situation of the two furnaces. The amount of alloy added.
14. If the chemical analysis results in the furnace show that the carbon is high, add some iron oxide blocks for decarburization. If the carbon is low, add some pig iron blocks for carbonization; if the average furnace sulfur is ≤0.055%, the steel is exhausted. Oxidation slag, increase the amount of synthetic slag added for desulfurization treatment, at which time the tapping temperature must be properly increased. If the average furnace sulfur of the two furnaces is ≥0.055%, the molten steel should be treated in a batch furnace, that is, the molten steel should be partially poured into the ladle. Into other furnaces, and then add some silicon steel sheet punches in the two furnaces for smelting and then tapping. If the phosphorus is high, it can only be processed in a batch furnace.
15. After the melting of the steel in the furnace is completed, the furnace group will carry the slag into the furnace. After the slag is poured, it is strictly forbidden to add moist, oily, painted and tubular scrap into the furnace. The dry and clean materials are in the smelting process. It should be prepared. After the molten steel in the furnace is full, the slag is cleaned again. After the cleaning, the alloy is quickly added to the alloy. The alloy is added for more than 3 minutes before the steel is tapped. The purpose is to make the alloy have a uniform composition in the furnace.
16, the tapping temperature: the upper continuous casting 1650 - 1690; the molten iron water around 1450.
17. The temperature of the molten steel in front of the furnace is measured. According to the tapping temperature and tapping time required for continuous casting, the transmission curve is controlled. It is strictly forbidden to keep the intermediate frequency furnace at high temperature (the holding temperature is controlled below 1600 °C)
18. After the notification of continuous casting and steel is obtained, the temperature is raised rapidly. The heating rate of the intermediate frequency furnace in the liquid state of the full furnace is about 20 ° C / min before 20 furnaces; about 30 ° C / min for 20-40 furnaces; 40 ° C / min, while paying attention to the higher the furnace temperature, the faster the heating rate.
19. When the first furnace is tapped, 100 kg of synthetic slag slag is added to the ladle for heat preservation. After the second furnace is tapped, 50 kg of covering agent is added to the ladle to keep warm.
20. After the medium frequency furnace has finished the steel, carefully check the condition of the furnace lining. It is strictly forbidden to draw water into the furnace to cool down. If some parts of the lining are seriously eroded, the furnace should be carefully prepared before the furnace can be opened. After the furnace is repaired, the furnace water must be used. All the evaporation can be added after the evaporation, first add a suction cup silicon steel punch in the furnace, and then add other scrap steel. The first furnace after the furnace should control the power supply curve, so that the furnace lining has a sintering process to ensure the furnace The effect is that it is strictly forbidden to add large pieces of waste to the furnace immediately after the furnace is repaired.
21. The entire production process is strictly prohibited when the furnace panel is exposed to the outside and the rubber is found to be damaged in time.