What are the methods to control the appearance of scum in the crystallizer1. Under normal circumstances, appropriately increase the amount of Mn-Si alloy, red
What are the methods to control the appearance of scum in the crystallizer
1. Under normal circumstances, appropriately increase the amount of Mn-Si alloy, reduce SiC alloy from 5.4kg/t to 4.6kg/t, and try to control the finished Si within 0.35~0.45%. Reduce the formation of high-melting silicate secondary oxides, improve the fluidity of molten steel, and promote the floating of inclusions.
2. Improve the final hit rate of the converter, add 0.19kg/t silicon-aluminum-ferro final deoxidizer when tapping, increase the deoxidation depth of molten steel, reduce the oxygen content of molten steel, and reduce the probability of secondary oxidation of molten steel during the pouring process.
3. Improve the slag blocking effect and reduce the amount of slag. When the slag is large, the amount of deoxidizer should be appropriately increased according to the amount of slag. When the bottom of the ladle is blown, the exposed size of the molten steel is not larger than a circle with a radius of 200mm to prevent slag from being caught in the molten steel. At the same time, ensure that the bottom blowing time of the molten steel is ≥5 minutes to promote the full floating and removal of inclusions. After blowing, add one to two packages of slag absorbent to each furnace in the ladle.
4. Control the production rhythm to ensure that continuous casting is filled with steel and prevent low-level steel from causing slag entrapment in the tundish. For HRB335 ultra-fine grain steel, increase the lower limit temperature of molten steel pouring by 5°C, that is, the temperature of the tundish molten steel is> 1510°C, and the temperature of the tundish molten steel is controlled at 1510 to 1525°C to improve the liquidity of molten steel.
When facing the mold running cone, since the lower mouth has been fixed, the upper mouth can be adjusted when the taper is adjusted online.
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Harm of too high temperature: when molten steel out of cooper mold, the billet shell is thin and easy to break out; The accelerated erosion of refractory can ea
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1. The barrier function (mainly completed by the liquid slag layer) isolates the contact between air and molten steel, blocks the secondary oxidation of molten
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In continuous casting, low corrosion resistance often occurs, which directly leads to uneven composition and will eventually affect the smelting quality. In or