Continuous casting crystallizer protective slag for medium-carbon rare earth steel plate
A continuous casting crystallizer and medium-carbon rare earth technology, applied in the field of steelmaking-continuous casting, can solve the problems of weakening the reactivity of mold slag and molten steel, deteriorating the lubrication of the slab shell, and affecting the smooth running of continuous casting. Improve the lubrication effect and reduce the occurrence of cracks
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Embodiment 1
[0018] The mass percent of the chemical composition of the carbon rare earth steel plate produced in this embodiment is: C 0.157%, Si0.29%, Mn 1.26%, P 0.0128%, S 0.001%, RE 0.0010%, and the rest is Fe and unavoidable residual impurities. The casting section size is 2000×250mm rare earth steel plate, and the casting speed is controlled at 0.9m / min.
[0019] The composition and mass percentage of the mold powder for the continuous casting mold for the medium-carbon rare earth steel plate used in this embodiment are: SiO 2 25.57%, CaO 31.2%, MgO 2.16%, A1 2 o 3 3.69%, MnO 3.73%, FeO 0.5%, Na 2 O7.91%, F 6.65%, C 14.5%, K 2 O 0.234%, Li 2 O 0.138%, the rest is water and unavoidable impurities. The melting temperature (hemispherical point) of the mold flux is 1138°C, when the viscosity is 1300°C, it is 0.21 Pa.S, the melting speed is 42S, and the basicity R is 1.22. During the production, the mold powder and its molten slag were sampled and tested. The whole casting has ...
Embodiment 2
[0023] The mass percentages of the chemical components of the medium-carbon rare earth steel sheet in this embodiment are: C 0.16%, Si 0.29%, Mn 1.28%, P 0.0135%, S 0.0012%, RE 0.0012%, and the rest is Fe and unavoidable residual Impurities. The casting section size is 2000×250mm rare earth steel plate, and the casting speed is controlled at 0.9m / min.
[0024] The composition and mass percentage of the mold slag used in the continuous casting mold for the rare earth steel plate used in this embodiment are: SiO 2 26.10%, CaO 32.6%, MgO 2.2%, A1 2 o 3 3.31%, MnO 3.78%, FeO 0.35%, Na 2 O7.9%, F 6.9.%, C 15.1%, K 2 O 0.234%, Li 2 O 0.134%, the rest is water and unavoidable impurities. The melting temperature (hemispherical point) of the mold flux is 1140°C, when the viscosity is 1300°C, it is 0.21 Pa.S, the melting speed is 43S, and the basicity R is 1.24. The whole casting has good castability, stable process, good quality of cast slab, and the qualified rate of cast sla...
Embodiment 3
[0028] The mass percentages of chemical components of the rare earth steel plate in this embodiment are: C 0.17%, Si 0.28%, Mn 1.30%, P 0.0132%, S 0.0011%, RE 0.0013%, and the rest is Fe and unavoidable residual impurities. The casting section size is 2000×250mm rare earth steel plate, and the casting speed is controlled at 0.9m / min.
[0029] The composition and mass percentage of the mold slag used in the continuous casting mold for the rare earth steel plate used in this embodiment are: SiO 2 26.0%, CaO 31.8%, MgO 2.16%, A1 2 o 3 3.68%, MnO 3.75%, FeO 0.32%, Na 2 O7.89%, F 7.2%, C 15.0%, K 2 O 0.24%, Li 2 O 0.136%, the rest is water and unavoidable impurities. The melting temperature (hemispherical point) of the mold flux is 1136°C, when the viscosity is 1300°C, it is 0.138 Pa.S, the melting speed is 39S, and the basicity R is 1.22. During the production, the mold powder and its molten slag were sampled and tested. The whole casting has good castability, stable proc...
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