medium carbon ferro manganese
Medium carbon ferro manganese generally refers to medium and low carbon ferro manganese.
Medium carbon ferro manganese with carbon content of 0.7%-2.0%, ferro manganese is mainly an alloy composed of two elements, manganese and iron, and is deoxidizer and alloying material most used in steelmaking. Medium and low carbon ferro manganese can be divided into low carbon ferro manganese with carbon content less than 0.7% and medium carbon ferro manganese.
The cold charging method is a traditional method for producing medium carbon ferro manganese, and the refining furnace used is a tilting graphite electrode electric arc furnace. The smelting process of medium carbon ferro manganese includes furnace repair, arc ignition, charging, melting, refining and tapping.
Furnace repairing: the furnace lining is made of magnesia material: under the high temperature of smelting, the furnace lining is eroded by slag and metal and the effect of high temperature of the arc, the refractory materials of the furnace bottom and furnace gradually become thinner, and the tap hole is more easily damaged. After ironing, plug the tap hole and repair the furnace immediately.
Arc ignition, feeding and melting: After the furnace repair is completed, a layer of lime extracted from the batch is firstly laid on the bottom of the furnace, followed by adding part of the manganese-silicon alloy to start the arc, and then the rest of the mixture is added to the furnace at one time. After the charge is added, power on to full load. In order to reduce heat loss and shorten the melting period, the charge on the edge of the furnace should be pushed to the vicinity of the electrode and the furnace core in time, but slag turning and splashing should be prevented: after the charge is basically melted (the silicon content of the alloy has dropped to 3%- 6%, the slag basicity and manganese content are also close to the final slag), and then enter the refining period.
Refining: Since the slag temperature has reached 1500-1600°C in the final stage of melting, the desiliconization reaction has basically ended, so the desiliconization rate during the refining period is slowed down. In order to speed up desiliconization and shorten the refining time, the molten pool should be stirred several times, and samples should be taken regularly to judge the silicon content of the alloy and determine the tapping time. The silicon content of the alloy is generally controlled within the range of 1.5%-2.0%. After refining for a period of time, the silicon content of the alloy is still high, and some manganese ore and lime can be added to the furnace, and the refining can be continued until the silicon content is qualified. Manganese volatilization loss and increase in electrical energy consumption. Therefore, it is not appropriate to overemphasize the manganese content in the slag.
Tapping: When the silicon content of the alloy basically meets the requirements, the power can be cut off for sedation, so that the metal particles in the slag are fully settled, and then the iron is tapped. When tapping, the alloy and slag flow into the ladle together. Due to the mixing effect between the slag and the alloy during tapping, 0.2%-1.0% of silicon can be removed outside the furnace. The molten iron that has just come out of the furnace has a high temperature and is mixed with slag, so it should not be poured immediately to prevent the ingot mold from being burned out and slag inclusion in the iron. The depth of the casting mold should not exceed 300mm, otherwise the temperature of the center of the alloy will be too slow, resulting in segregation, resulting in the enrichment of impurities, and the product will be scrapped in serious cases.
There is no price change for medium carbon ferro manganese today. Medium carbon ferro manganese with Mn 75% and Carbon 2.0% is 8800-9000 RMB/ Ton in cash, and low carbon ferro manganese with carbon 80% and carbon 0.7% is 10300-10400 RMB/ ton in cash. In terms of traders, this week, traders were more cautious in their purchases, with poor shipments and low-cost sources of goods being hard to find, their profits were compressed. On the whole, the weak operation of medium and low carbon ferro manganese will continue to pay attention to the steel recruitment situation in September.