Temperature hazard of molten steel in continuous castingIn the process of continuous casting, if the temperature is high, it will affect the final quality, but
Temperature hazard of molten steel in continuous casting
In the process of continuous casting, if the temperature is high, it will affect the final quality, but also affect the use of the crystal accessories, so it is reasonable to control, in accordance with the normal standards of operation is reasonable, so as to improve the work efficiency.
Temperature hazard of continuous casting molten steel:
Harm of high temperature: thin billet shell of crystallizer, easy to leak steel; Refractory erosion speed, easy to lead to casting loss control, reduce casting safety; The increase of non-metallic inclusion will affect the internal quality of the slab. Billet columnar crystal developed; The center segregation is aggravated and the center line cracks are easy to occur.
The harm of molten steel temperature is too low: it is easy to cause the blockage of the nozzle, and the casting is interrupted; The surface of continuous casting is easy to produce blister, slag inclusion, crack and other defects; Non-metallic inclusion is not easy to float, which affects the inner quality of billet.
Temperature control of molten steel in ladle: according to the type of steel to be smelted, the temperature of steel out is strictly controlled to make it change in a narrow range; Second, the temperature drop from the drawing, ladle, ladle transportation and the whole process into the tundish should be minimized.
At the same time, in order to better work, square sleeve and pin are usually in the skin protection, too hidden, usually difficult to check, but can be confirmed before assembly, it is recommended to surfacing wear resistant layer at the red line, hardness HRC50, specially for square sleeve sliding. ^ In the recent use of chamfered mold, the narrow side frame is frequently disassembled to repair, in the assembly process, there is also the possibility of "small square sleeve" installed in the "generous hole", in the assembly process, grinding the pin shaft, can also reduce the pin shaft diameter by 0.3, thereby increasing the cumulative fit clearance.
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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